Early Access Versions of AstroGrav
Users of AstroGrav are entitled to download and use early access versions of AstroGrav when they are available. These give you the opportunity to try out and comment on new features before they are finalized and released to the general public, and your feedback can help identify bugs and influence the final form that new features take.
AstroGrav Software License Agreement
You must click on the button below to accept the AstroGrav Software License Agreement before downloading any early access versions of AstroGrav.
AstroGrav Early Access Download
When you have accepted the license agreement, you can click on one of the buttons below to download the AstroGrav installer.
Alternatively, if you already have a version of AstroGrav installed on Windows, you can click on the button below to download just the AstroGrav executable (AstroGrav_ea.exe), without the sample simulations and documentation. This must be placed in the same location as your currently installed executable in order for it to work correctly.
AstroGrav Early Access Versions
The following early access versions of AstroGrav 5.4 have been released.
The documentation and tutorial have not yet been updated to cover the new features and changes. Please contact us if you require further information or advice.
AstroGrav 5.4 Early Access 01 was uploaded on 5th May 2025, and has the following improvements and bug fixes in addition to those in earlier versions.
- A new Refraction command has been added to the View / Show menu, which shows refraction on view windows when viewing from an Earth location.
AstroGrav 5.4 Early Access 02 was uploaded on 8th May 2025, and contains fixes to several bugs in the Refraction command that was introduced in Early Access 01.
AstroGrav 5.4 Early Access 03 was uploaded on 17th June 2025, and has the following improvements and bug fixes in addition to those in earlier versions.
- A new Daylight command has been added to the View / Show menu, which shows daylight on view windows when viewing from an Earth location. Unlike everything else on a view window, the daylight is at a fixed brightness, and is not sensitive to the brightness controls in the View / Brightness menu.
- A new Colorshift command has been added to the View / Show menu, which shows redshift and blueshift on view windows. This command will have no noticeable effect in most cases, because redshift and blueshift are only significant for very high velocities. A good example of where there is a noticeable effect is the Planetary Aberration sample simulation.
- The Refraction command that was introduced in Early Access 01 has been improved to make refraction sensitive to the viewpoint's elevation, instead of always assuming a zero elevation.