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Version History

Below is a list of all versions of AstroGrav, with a brief summary of the changes and improvements made in each version. The list is in reverse chronological order, with the more recent versions towards the top and the older versions towards the bottom.

Version 3.4.1 - 16th May 2017

Corrected a fault that caused the JPL asteroid and comet import tables to appear empty in the Edit / Import Objects... command.
Improved the display of celestial grids so that they are displayed correctly at very high magnifications.
Made searching on background stars faster and much more flexible.
Made many improvements to the information displayed on object windows.
Added the lunar distances and modified julian days units.
Allowed an object's editor to be opened by double-clicking on the object with the Alt key depressed.
Made significant improvements to evolution performance.
Various minor bug fixes and improvements.

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Version 3.4 - 16th December 2016

Greatly expanded the choice of object types from 8 to about 50, with the inclusion of many useful subtypes.
Added View / Show All / Angles... and View / Show Selected / Angles... commands to display the angles between pairs of objects.
Added a Window / Export... command to export a text representation of the active window's contents that is ideal for use in a text editor, word processor, or spreadsheet application.
Made several significant enhancements to the generation of ephemerides in solar system simulations using the Tools / Generate Ephemeris... command.
Redesigned object windows, with the inclusion of three different sets of celestial coordinates - ecliptic, equatorial, and horizontal.
Made several improvements to the information that is displayed when double-clicking on a background star in a solar system simulation, including the addition of celestial coordinates and continuous updating of data during evolution.
Made several improvements to the sample simulations.
Various minor bug fixes and improvements.

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Version 3.3.3 - 29th July 2016

Improved the Edit / Import Objects... command to allow the filtering of asteroid and comet tables to show just the ones that were discovered in a particular year.
Improved the View / Show All / MOIDs... and View / Show Selected / MOIDs... commands to include parabolic, hyperbolic, and anti-hyperbolic orbits, as well as orbits that don't share a common focus.
Added the jupiter masses and jupiter radii units.
Improved the accuracy of ephemeris table calculations with Light-Time Correction in the Tools / Generate Ephemeris... command.
Made evolution with general relativity slightly more accurate and slightly faster.
Made many improvements to the sample simulations.
Various minor bug fixes and improvements.

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Version 3.3.2 - 25th April 2016

Added a choice of units to the Edit / Date/Time... and Evolve / Evolve To... commands.
Made improvements to the Edit / Import Objects... command.
Improved the ordering of files in the File / Open Recent... menu.
Corrected faults that could cause the incorrect calculation of distances between objects and minimum orbit intersection distances (MOIDs) between orbits.
Modified commands to allow luminosities to be editable with all types of objects.
Improved the drawing of trajectories to avoid drawing unwanted cusps at sharp turns in the trajectories.
Corrected a fault that could cause the Evolve / Evolve To... command to evolve to the wrong time when using the fractional days unit.
Various minor bug fixes and improvements.

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Version 3.3.1 - 1st April 2016

Added an Export button and a Help button to all tables.
Increased the number of lines in table headers from two to three, so that the displayed text doesn't have to be abbreviated as much as before.
Added the phase of the target object to the default set of table columns that are displayed with the Tools / Generate Ephemeris... command.
Added keyboard shortcuts to 25 of the commands that didn't previously have keyboard shortcuts, making the use of AstroGrav more efficient for expert users.
Increased the absolute magnitude of the JPL Comets from 10.0 to 12.0 in the Edit / Import Objects... command.
Used more accurate values of the color, radius, and mass of the New Horizons spacecraft in the New Horizons sample simulation.
Various minor bug fixes and improvements.

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Version 3.3 - 4th March 2016

Added View / Show All / Distances... and View / Show Selected / Distances... commands to display the distances between pairs of objects.
Added View / Show All / MOIDs... and View / Show Selected / MOIDs... commands to display the minimum orbit intersection distances (MOIDs) between pairs of orbits.
Added a Help / AstroGrav Google+ command to go straight to the Google+ site that is associated with AstroGrav.
Added a Potentially Hazardous category for use when filtering a table of asteroids or comets.
Added Kreutz Sungrazer, Meyer Sungrazer, Kracht Sungrazers, Marsden Sungrazer, General Sungrazer, and Jupiter-Family categories for use when filtering a table of comets.
Made several improvements to the Tools / Create Movie... command.
Added 40 major astronomical observatories to the standard list of Earth locations.
Various minor bug fixes and improvements.

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Version 3.2.1 - 23rd December 2015

Enhanced the Edit / Find... command to allow searching for background stars and constellations in solar system view windows.
Corrected a fault that made a view window unusable when a found object was already positioned at the exact center of the window.
Greatly improved the error messages that are displayed when attempting to read or write data without the appropriate read/write permissions.
Modified many of the dialog windows to give them an improved and consistent appearance.
Significantly improved the documentation for several commands.
Various minor bug fixes and improvements.

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Version 3.2 - 25th November 2015

Greatly improved the accuracy of solar system evolution when dealing with close encounters between objects.
Added to the Evolve / Evolve To... command a choice between animated and non-animated evolution.
Added an option to take into account the effect of radiation pressure during simulation evolution.
Made the Edit / Import Objects... command faster, more accurate, and easier to use.
Added an option to quickly evolve a newly opened solar system simulation to the present time.
Made several improvements to the sample simulations.
Various minor bug fixes and improvements.

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Version 3.1.1 - 28th September 2015

Corrected a fault that prevented AstroGrav from starting up on some Windows computers, with the display of the message: The JVM could not be started. The maximum heap size (-Xmx) might be too large or an antivirus or firewall tool could block the execution.
Corrected a fault that caused the Evolve / Evolve To... and Edit / Date/Time... commands to fail for users in the western hemisphere (the Americas) when specifying a date.
Transferred the Edit / Locations... command to the Tools / Edit Locations... command.
Corrected a fault that caused accented characters to be incorrectly displayed in locations, both in lists of locations and on status bars.
Corrected a fault that prevented the display of the 'document modified' indicator on a Mac window's red traffic light.
Various minor bug fixes and improvements.

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Version 3.1 - 15th September 2015

Added the new Tools / Reference Frame... command, which changes the reference frame so that the barycenter is stationary, at the origin, or both.
Added the new Tools / Take Snapshot... command, which takes a snapshot of the current display.
Added the new Tools / Create Movie... command, which creates a movie of a simulation while it is evolving.
Added the new Tools / Generate Ephemeris... command, which generates an ephemeris for any object in a solar system simulation while it is evolving.
Modified the Mac version so that it no longer requires an installation of Java.
Made the New Horizons sample simulation much more accurate.
Various minor bug fixes and improvements.

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Version 3.0.6 - 24th June 2015

Greatly speeded up evolution in cases where small time steps are being used.
Improved evolution performance in most simulations.
Corrected a fault that caused AstroGrav to crash when evolving a large number of overlapping objects with bouncing collisions.
Made several other minor improvements to the handling of bouncing collisions.
Corrected a fault that caused an unwanted automatic change to the fixed point after accepting a 'Do you want to detach your viewpoint?' question in a view window.
Corrected a memory leak that could cause AstroGrav to run short of memory after starting and stopping evolution a very large number of times.
Various minor bug fixes and improvements.

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Version 3.0.5 - 7th May 2015

Made the evolution algorithm much more accurate in situations (such as exoplanet simulations) where there is a dominant object.
Speeded up evolution in many simulations, particularly those involving collisions.
Improved the solar system sample simulations to have more accurate masses for the main solar system objects.
Made the keyboard entry of dates and times in the Edit / Date/Time... and Evolve / Evolve To... commands more flexible and less insistent on a particular format.
Corrected a fault that caused an unwanted 'null' entry in the undo/redo chain when evolution was stopped before anything had changed.
Various minor bug fixes and improvements.

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Version 3.0.4 - 19th March 2015

Added help buttons to the dialog windows of the more complex commands.
Added the View / Selections... command to allow a choice of different behaviours when objects are selected.
Added the time zone or time unit to the dates and times shown on status bars.
Improved the Edit / Import Objects... command so that the small body type and Fast import without evolution setting are automatically saved and restored.
In the Edit / Import Objects... command, moved the Fast import without evolution checkbox to the following dialog window, where it is more useful.
Fixed a memory leak that could cause AstroGrav to run short of memory when large numbers of windows were opened and closed in a simulation.
Various minor bug fixes and improvements.

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Version 3.0.3 - 13th February 2015

Made several improvements to the editing features that simplify editing in complex situations.
Changed the value used for the astronomical unit from 149597870691.0 meters to 149597870700.0 meters.
Corrected a fault that could prevent a simulation from evolving when collisions were not being ignored.
Corrected a fault that could cause a simulation to evolve differently depending on the collisions setting, even when no collisions actually occurred.
Added a color randomizer to the Edit / Split Object... command so that the individual objects in a rubble pile can be easily distinguished.
Enhanced the File / Import... command so that it automatically strips out Excel's surrounding double quotes when attempting to parse numbers.
Various minor bug fixes and improvements.

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Version 3.0.2 - 18th December 2014

Added the Edit / Split Object... command to allow the easy conversion of an asteroid, comet, or other object into a rubble pile.
Greatly improved the performance when evolving simulations that contain rubble piles.
Changed the start date of the Solar System sample simulations to 01/01/2015.
Changed the names of comets in the Solar System sample simulations to the standard form that is used in the comet import (Edit / Import Objects...) command.
Added comet C/2014 Q2 (Lovejoy) to the Solar System sample simulations.
Improved the choice of mnemonics used for the items in the Edit menu.
Various minor bug fixes and improvements.

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Version 3.0.1 - 29th October 2014

Corrected a fault that prevented licenses from being registered on Mac OS X 10.9 (Mavericks).
Corrected a fault that could prevent a simulation from evolving when a comet or asteroid was being simulated as a rubble pile.
Improved the toolbar overflow menu so that it stays displayed until manually hidden with a second click.
Improved the toolbar overflow menu so that it responds correctly to the resizing of its containing window.
Corrected a fault that caused a toolbar overflow menu to fail to move around with its containing window.
Various minor bug fixes and improvements.

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Version 3.0 - 1st October 2014

Added the ability to view from locations on the Earth's surface in order to give the software planetarium-style capabilities in solar system simulations.
Enhanced the options available with the View / View From... and View / Fix... commands.
Added the View / Background / Horizontal Grid command to display the local horizontal (altitude-azimuth) coordinate grid in solar system simulations.
Added the View / Background / Horizon command to display the local horizon in solar system simulations.
Added the View / Background / Galactic Grid command to display the galactic coordinate grid in solar system simulations.
Added the View / Background / Galactic Plane command to display the galactic coordinate plane in solar system simulations.
Made major improvements to the way that bouncing collisions are handled during evolution.
Various minor bug fixes and improvements.

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Version 2.2.3 - 10th June 2014

Added the View / Show All / Data command to display the distances, speeds, magnitudes, and phases of objects in view windows.
Added the View / Show All / Nodes command to display the ascending nodes and descending nodes of objects in view windows.
Added the View / Show All / Apsides command to display the pericenters and apocenters of objects in view windows.
Added the corresponding three commands to the View / Show Selected menu.
Added the View / Fix... command to provide an alternative way of fixing an object.
Added the View / View From... command to provide an alternative way of viewing from an object.
Added a small button to the top-right corner of tables that makes it much easier to scroll to a particular part of a very large table.
Various minor bug fixes and improvements.

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Version 2.2.2 - 11th May 2014

Greatly improved the View / Show / Trajectories and View / Show / Histories commands so that they now work correctly with all combinations of viewpoints and fixed objects.
Combined the Edit / Add Object... and Edit / Add Child... commands into a single Edit / Add Object... command that first shows a small dialog that lets you to choose the parent of the new object.
Changed the naming convention used for comets so that they now have their names in the standard form of 1P/Halley, C/1995 O1 (Hale-Bopp), etc.
Greatly speeded up evolution when using the General Relativity option.
Added several improvements and bug fixes to the evolution algorithm.
Added several improvements to the user interface.
Various minor bug fixes and improvements.

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Version 2.2.1 - 19th February 2014

Added a menu of categories to comet and asteroid import tables that makes it easy to quickly pick out particular categories of comets and asteroids.
Corrected a fault that caused Julian Days to be incorrectly rounded in asteroid and comet import tables.
Enhanced the View / Show / Barycenters command to show the barycenters of all families of objects, instead of just showing the barycenter of the entire system.
Changed the Edit / Find... command to place the found object at the center of the window instead of near the edge.
Improved the ecliptic grids and equatorial grids by showing less longitude lines and less latitude labels near the poles.
Added the Asteroid Apophis sample simulation to illustrate how its orbit is significantly changed by the influence of the Earth's gravity during the very close encounters in 2029 and 2036.
Various minor bug fixes and improvements.

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Version 2.2 - 26th November 2013

Replaced the Newton: Fast and Newton: Accurate choices with a single Newtonian choice, so that it no longer necessary to choose between speed and accuracy.
Improved both speed and accuracy in most simulations.
Greatly improved energy conservation in stable systems (such as the solar system and exoplanet systems), so that it is now possible to run such simulations over very long periods of time.
Improved the handling of the evolution mass threshold.
Added many recently discovered objects to the solar system sample simulations.
Suppressed any coordinate axis that is pointing almost straight in or straight out of a window, so that 2-D simulations no longer show the unwanted third coordinate axis.
Various minor bug fixes and improvements.

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Version 2.1.2 - 28th August 2013

In solar system simulations, changed the non-standard Julian Year date unit to the standard Julian Epoch date unit.
Changed the Year time unit that is used for orbital periods and time steps from 365.2424 days (vernal equinox year) to 365.25 days (Julian year).
Removed the undesirable flickering of view windows during resizing.
Corrected a fault that could cause ascending node labels and descending node labels to jump from one side of the orbit to the other when rotating a system.
Corrected a fault that could cause history labels to jump from one side of the trajectory to the other when rotating a system.
Modified the Edit / Add Family... command so that every new object now has the same number of characters in its name, and so consequently, sorting now works intuitively.
Various minor performance improvements.

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Version 2.1.1 - 24th July 2013

Fixed a serious bug that prevented evolution from working after using the File / New or File / Import... commands.
Various minor performance improvements.

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Version 2.1 - 30th June 2013

Made many improvements and bug fixes to simulation evolution.
Improved the calculation of solar system orbital elements to make them consistent with the conventions that are usually used for the solar system.
Corrected several faults that could occur when importing objects into solar system simulations using the Edit / Import Objects... command.
Made major performance improvements to the handling of simulations that contain a large number of objects.
Greatly speeded up the closing of windows and exiting/quitting of AstroGrav.
Corrected a fault that could cause negative angles to get rounded incorrectly.
Corrected a fault that often caused the right ascension '0h 00m' to be overlaid with '24h 00m' on the display of the celestial equator.
Various minor bug fixes and improvements.

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Version 2.0.2 - 21st December 2012

Made many improvements to the display of ecliptic grids and equatorial grids.
In solar system simulations, added ascending node indicators and descending node indicators to the orbits of selected objects that have the Sun as a parent.
Improved the magnitude key by making the magnitudes of the key stars sensitive to the magnification and brightness.
Made the crosses indicating selected objects visible regardless of whether or not the object itself is bright enough to be visible.
Corrected a fault that caused AstroGrav to crash when viewing from the single object in a simulation with just one object.
Made several improvements to the asteroid and comet tables that are displayed with the Edit / Import Objects... command.
Corrected a fault that could cause an edited orbital period to get corrupted when using the object editor.
Added the Tau Ceti sample simulation in order to illustrate the system of five planets that have recently been found to be orbiting the star Tau Ceti.
Various minor bug fixes and improvements.

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Version 2.0.1 - 11th November 2012

Multi-threaded the evolution algorithm, so that it runs significantly faster on multi-processor and multi-core computers.
Corrected a fault that caused the General Relativity evolution option to be very unreliable in some circumstances.
Speeded up animated evolution on multi-processor and multi-core computers by using one processor/core to update the screen display while a second processor/core works on calculating the following state of the simulation.
Improved the handling of collisions during evolution.
Corrected faults related to the display of background star names.
Made several improvements to the sample simulations.
Corrected a fault that could cause AstroGrav to crash on Windows PCs with Intel Core i7 processors.
Various minor bug fixes and improvements.

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Version 2.0 - 6th August 2012 (Mohrle's Birthday)

Added a completely new evolution algorithm that is much more accurate than the evolution algorithm used in previous versions, and that contains several new settings.
Added two new commands in the View / Show menu.
Added two new commands in the View / Show All menu.
Added the new View / Show Selected menu, together with its eight new commands.
Added the new View / Background menu, together with its twelve new commands.
Added the new Edit / Reverse Objects command, which reverses the direction of the current selection of objects in the active window.
Added the new Edit / Import Objects... command, which imports comets and asteroids from the websites of NASA's Jet Propulsion Laboratory and the IAU's Minor Planet Center.
Various minor bug fixes and improvements.

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Version 1.9.4 - 10th December 2011

Added the View / Show / Barycenter and View / Show / Grayscale commands.
Made several improvements to the sample simulations.
Corrected a fault that caused the Evolve / Evolve To... command to evolve to the wrong time when the time step was changed during evolution.
Added the Control+U (Command+U on a Mac) keyboard shortcut to the Window / Units command.
Corrected a fault that caused Control+Double-Click (Command+Double-Click on a Mac) on a view window to incorrectly show the object editor.
Corrected the Undo/Redo tool tips when the operation that is to be undone/redone is an edit of one of the units.
Various minor bug fixes and improvements.

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Version 1.9.3 - 23rd October 2011

Changed the way that Units and Notes windows are displayed, so that they can be left open while interacting with other parts of the user interface.
Added the asteroid 2010 SO16 to the Earth's Quasi-Moons sample simulation.
Added the Earth Trojan sample simulation to show the asteroid 2010 TK7, which was recently discovered to occupy a Trojan orbit with respect to the Earth.
Added the Units window to many of the sample simulations.
Corrected a fault that could cause the significant digits of position and speed quantities to get reduced to 4.
Corrected a fault that caused a window with a tool palette to disappear when another application's window was clicked.
Various minor bug fixes and improvements.

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Version 1.9.2 - 2nd July 2011

Added the display of the (x, y, z) coordinates of the viewpoint to the status bar of a view window.
Corrected a fault that could cause 60 to be displayed as the number of minutes or seconds in formatted angles.
Corrected a fault that prevented the File / Import... and Edit / Paste commands from working.
Corrected a fault that caused a new or duplicate view window to initially appear blank on some computers.
Corrected a fault that caused the newly visible part of a maximized view window to initially appear blank on some computers.
Corrected a fault that prevented the angle cursor from being displayed on a view window when specifying an angle to display.
Various minor bug fixes and improvements.

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Version 1.9.1 - 31st March 2011

Corrected a serious fault that made version 1.9 unusable for a small proportion of users upgrading from version 1.8.4 or earlier.
Added the symbols for elements (a, e, i, omega, etc) to object windows, the object editor, and the new family editor, in order to make it clearer which element is which.
Added separators to the lists of units in popup menus to separate units into groups of SI units, imperial units, astronomical units, etc.
Corrected a fault in the Edit / Add Family... command that incorrectly allowed a separator to be selected in the popup menu of the Quick Setup box.
Made minor corrections to the notes of the Spiral Arms sample simulation.
Made several corrections to the capitalization of units.

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Version 1.9 - 17th March 2011

Made several corrections to minor faults in the evolution algorithm, and improved performance by about 15 percent.
Made many improvements to the sample simulations.
Made many improvements to the way that units are handled.
Corrected a fault that could cause table sorting to only partially sort the objects.
Corrected a fault that could cause a slight modification of a simulation's state whenever a view window was opened.
Improved the Edit / Date/Time... and Evolve / Evolve To... dialogs to allow minutes and seconds to be omitted without reporting an error.
Various minor bug fixes and improvements.

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Version 1.8.4 - 29th October 2010

Made many improvements to the sample simulations.
Added a "beep when finished" checkbox to the Evolve / Evolve To... dialog.
Corrected a fault that could cause a highly eccentric orbit (such as Comet McNaught's) to be inaccurately displayed.
Corrected a fault that could cause unwanted orbit lines to be displayed with a highly eccentric orbit (such as Comet McNaught's).
Improved the algorithm used to calculate the magnitude of a non-luminous body.
Simplified the installation of AstroGrav on Windows Vista and Windows 7.
Made table column selectors focusable, so that column selection can be done with the keyboard.
On view windows, made the negative coordinate axes slightly more prominent.
Various minor bug fixes and improvements.

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Version 1.8.3 - 1st September 2010

Changed the way that columns are shown and hidden in a table.
Added a new sample simulation illustrating the system of exoplanets orbiting the star HD 10180.
Corrected a fault that could cause AstroGrav to crash on computers with Intel Core i7 processors.
Corrected a fault that caused the Edit / Units... command to not work on an object window.
Corrected a fault that caused structure nodes to fail to stay open during evolution when the Open Root Parent preference was selected.
Corrected a fault that caused a comet with more than one illuminator to be vastly brighter than it should be, have an incorrect phase, and have an incorrect color.
Various minor bug fixes and improvements.

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Version 1.8.2 - 10th May 2010

Greatly improved the way that orbits are calculated.
Improved the handling of units by allowing the easy definition and use of a default selection of units.
Made several improvements and corrections to the sample simulations.
Corrected a fault that caused version 1.8.1 to crash when opening a simulation with a table that was last modified with version 1.6.3 or earlier.
Corrected a fault that caused an undo of an evolver settings edit made during evolution to sometimes not work.
Corrected a fault that caused double-clicking on a Mac data file to result in the startup preference activating as well as the file opening.
Various minor bug fixes and improvements.

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Version 1.8.1 - 17th December 2009

Speeded up the display of table windows and view windows.
Ensured that a tool palette always remains on screen when its owning window is moved, resized, or maximized.
Added recent discoveries to the Solar System sample simulations and changed their start date to 01/01/2010.
Corrected a fault that caused the Edit Object... button of an object window to fail to respond to the Carriage Return or Enter keys.
Corrected a fault that caused the width of a table column to revert to its default after being hidden, saved, re-opened, and re-shown.
Corrected a fault that caused the positions of objects on view windows to be slightly out of step with their orbits.
Improved the appearance of transiting reflective bodies on view windows.
Various minor bug fixes and improvements.

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Version 1.8 - 21st October 2009

Added several new commands for manipulating model windows.
Made several improvements to the handling of date and time units.
Made several improvements to tool bars and added new tool palettes.
Added new preference settings allowing you to specify the positions of tool bars and status bars.
Significantly reduced the size of the Windows download.
Improved the terminology used for the different types of windows.
Added several different custom cursors that make navigation less error prone.
Speeded up the graphics display in most cases.
Various minor bug fixes and improvements.

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Version 1.7.2 - 12th June 2009

Added a facility to save and restore family patterns in the Edit / New Family... command.
Added the Comet Gehrels 3 and Disaster! sample simulations.
Corrected a fault that caused a very slow response to an attempt to select a large number of objects.
The keyboard shortcut for the Evolve / Run Backward command now works correctly.
Expanding and collapsing a tree node can now only be done by using its handle, and not by double-clicking on it.
Corrected a fault that caused the preference for opening the root node of trees to be ignored in some cases.
Various minor bug fixes and improvements.

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Version 1.7.1 - 8th May 2009

Added the speed of an object to its label when it is selected on a model window.
Added the speed and magnitude of an object to its information popup.
Corrected a fault that could cause AstroGrav to not run at all on a small proportion of Windows PCs.
Added a preview panel to the color chooser.
Corrected a fault that could cause unwanted gaps to appear in some lines on model windows.
Various minor bug fixes and improvements.

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Version 1.7 - 3rd February 2009

Added facilities for selecting multiple objects, together with several new and enhanced commands that operate on multiple objects.
Added three new commands that can be used to cut, copy, and paste groups of objects.
Improved the commands for deleting and merging objects so that they operate on multiple selections.
Simplified the addition of new objects by splitting the Edit / Add Object... command into two separate commands.
Added a new Type field to the physical elements of objects, which may be set to Star, Planet, Moon, Asteroid, Comet, Spacecraft, or Projectile.
Various minor bug fixes and improvements.

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Version 1.6.3 - 4th November 2008

Improved the Edit / Find... command.
Added the View / Show / Data command to allow the data in the corners of model windows to be shown or hidden as desired.
Corrected a fault that could cause valid .ast files to be rejected as invalid.
Added recent discoveries and changes to the Solar System sample simulations and changed their start date to 01/01/2009.
Corrected a fault that could cause the status bar to fail to update correctly.
Slightly speeded up simulation evolution.
Various minor bug fixes and improvements.

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Version 1.6.2 - 5th September 2008

Improved the way that evolution is indicated on the status line.
Corrected a fault that occasionally caused part of an orbit to be drawn as a straight line instead of as a curve.
Corrected a fault that caused the magnitudes of objects to be displayed incorrectly.
Significantly speeded up the drawing of model windows.
Corrected a bug that sometimes caused a non-luminous object (such as a planet) to be invisible when in transit against a luminous object (such as the Sun).
Various minor bug fixes and improvements.

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Version 1.6.1 - 14th April 2008

Improved the Edit / Add Family... command to make experimenting with new families much easier.
Corrected a bug that could cause object collisions to sometimes not work correctly.
Improved number displays, so that numbers such as 1.2 no longer display as (for example) 1.199999999999998.
Corrected a bug that caused the horizontal scroll bar to never appear on new tables, regardless of the preference setting.
Corrected a bug that caused the Peri Arg column of exported data to just be a duplicate the Mean Anom column.
Various minor bug fixes and improvements.

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Version 1.6 - 14th January 2008

Added four new keyboard commands for adjusting the magnification in full screen mode.
Added four new keyboard commands for adjusting the brightness in full screen mode.
Added five new keyboard commands for controlling simulation evolution in full screen mode.
Added an installer and uninstaller for Windows.
Improved the Edit / Find... command.
Added the Help / Enter License... command to allow easier license entry.
Various minor bug fixes and improvements.

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Version 1.5 - 3rd December 2007

Added an animated and interactive full screen mode.
Added recently discovered objects to the Solar System sample simulations and changed their start date to 01/01/2008.
Speeded up simulation evolution, tree display, and phase drawing.
Various minor bug fixes and improvements.

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Version 1.4.3 - 3rd September 2007

Repositioned the windows of sample simulations to make much better use of larger monitor resolutions.
Corrected a bug on Windows that caused the Help / Model Navigation command to only work once.
Corrected a bug that caused the wrong time unit to be used in some situations.
Slightly speeded up simulation evolution.
Julian dates are now displayed without exponents - eg, 2454101.5 instead of 2.4541015e6.
Corrected a bug that could cause some table column headers to appear blank after the columns have been re-ordered.
Various minor bug fixes and improvements.

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Version 1.4.2 - 26th July 2007

Greatly reduced the flickering of faint objects on model windows, and speeded up the graphics drawing.
Added the facility to use Julian dates in Solar System simulations.
Corrected a bug causing duplicate options in the Quick Setup feature of the Edit / Add Family... command.
Corrected several bugs with the Undo and Redo commands of text components.
Various minor bug fixes and improvements.

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Version 1.4.1 - 3rd April 2007

Speeded up the graphics drawing on model windows.
Added the STEREO spacecraft sample simulation.
Corrected colors of major Solar System objects in the sample simulations.
Model window duplication when a simulation is evolving now works correctly.
Various minor bug fixes and improvements.

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Version 1.4 - 27th February 2007

Added Dutch, French, German, Italian, Portuguese, and Spanish localizations.
On Windows, greatly improved the performance and UI responsiveness.
Corrected a fault that could cause model navigation commands to function incorrectly during evolution.
File dialogs now keep track of the last used folder.
On Mac OS X, speeded up table displays.
Various minor bug fixes and improvements.

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Version 1.3.6 - 10th January 2007

Added Comet McNaught (C/2006 P1) to the Solar System and Planets, Comets sample simulations.
Added the New Horizons sample simulation.
Made the fields on detail windows copyable.
On Mac OS X, made the fields on detail windows much easier to read.
Added a menu item for displaying the Model Navigation Guide to the main popup menus.
Various minor bug fixes and improvements.

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Version 1.3.5 - 5th December 2006

Added recently discovered objects to the Solar System sample simulations and changed their start date to 01/01/2007.
On Mac OS X, corrected a bug that caused the brushed metal look and feel to not work on some computers.
Improved many of the tool tips and messages.
Various minor bug fixes and improvements.

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Version 1.3.4 - 18th September 2006

Significantly speeded up simulation evolution.
Improved the model window graphics by removing the 'edges' that could sometimes be seen on object auras.
Various minor bug fixes and improvements.

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Version 1.3.3 - 4th August 2006

Corrected a bug that could occasionally make a simulation unusable after a collision.
Speeded up simulation evolution.
Speeded up the opening of model windows.
Speeded up the creation of new families containing large numbers of objects.
Various minor bug fixes and improvements.

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Version 1.3.2 - 8th June 2006

Added Undo and Redo keystrokes to text components.
Added contextual popup menus.
Added a fault reporting facility.
Improved the startup time.
Improved the layout of the preferences dialog so that all the tabs now fit horizontally.
On Windows, improved some of the menu item mnemonics, mainly in the Edit menu.
On Windows, moved the list of recently used simulations from the File / Open Recent menu to the File menu.
Fixed several bugs that could cause model windows to function incorrectly in certain circumstances.
Various minor bug fixes and improvements.

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Version 1.3.1 - 22nd April 2006

Added mouse wheel functionality to model windows.
Made it easier to enter carriage returns in a simulation's notes.
Organised the sample simulation notes into sections.
On Windows, added numbers and mnemonics to the menu items in the list of recent files.
On Mac OS X, corrected a bug that could cause multiple file dialogs to be visible simultaneously.
Various minor bug fixes and improvements.

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Version 1.3 - 28th March 2006

Added the View / Show / Velocities command to display velocity vectors on model windows.
Added the View / Show / Acceleration command to display acceleration vectors on model windows.
Added the Edit / Merge Object command to merge the selected object with its parent.
Greatly improved the tool bar customization facility.
Added a preference option to display tool icons on menu items in addition to the usual text.
Many minor bug fixes and improvements.

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Version 1.2.3 - 22nd December 2005

Solved the serious graphics performance problems on Mac OS X 10.4 (Tiger).
Speeded up simulation evolution (by approximately 15%).
Added recent discoveries to the Solar System sample simulations.
Various minor bug fixes and improvements.

Version 1.2.2 - 22nd November 2005

Speeded up the graphics drawing (by approximately 25%).
Added the Help / AstroGrav Tutorial menu item.
On Windows, changed the startup default from Create New Simulation to Open Latest Simulation.
Added the tutorial simulation to the default recent file list.
Various minor bug fixes and improvements.

Version 1.2.1 - 3rd October 2005

Greatly accelerated the graphics drawing on Mac OS X 10.4 (Tiger).
Made the Help / AstroGrav Help command automatically locate the latest version of the application's documentation.
Provided a much improved Read Me document.
Various minor bug fixes and improvements.

Version 1.2 - 6th September 2005

Enhanced the licensing software.
Made the sample simulations read-only to prevent them from getting accidently overwritten.

Version 1.1 - 6th August 2005 (Mohrle's Birthday)

Added the Help / AstroGrav Home Page command.
Added the Help / Purchase License... command.

Version 1.0.2 - 12th July 2005

Corrected a bug that could cause the center of mass fixed point to sometimes be incorrect.
Made dragging .ast files onto the application icon work correctly on Windows.
Corrected a model window bug that caused object name brightnesses to be incorrect for very low magnifications.
Improved the license validation user messages.
Various minor bug fixes and improvements.

Version 1.0.1 - 22nd June 2005

On Windows file save dialogs, added a message asking the user if it is OK to overwrite the file if it already exists.
Modified the File / Open Recent menu to distinguish between identical filenames by showing (partial) paths.
Added a separate ICNS icon for .ast files on a Mac.
Corrected the bug that made model window views 'flip' 180 degrees when dragged from a point to the exact same point.
Various minor bug fixes and improvements.

Version 1.0 - 10th May 2005

Initial release.