The current version of Mars24 is 6.0.3, released 2008-08-05.

Mars24 is a Java program which displays a Mars sunclock, a graphical representation of the planet Mars showing its current sun- and nightsides, along with a numerical readout of the time in 24-hour format. Other displays include a plot showing the relative orbital positions of Mars and Earth and a diagram showing the solar angle for a given location on Mars.

Mars24 runs on many different types of computers, including Windows, Mac OS X, Linux, and more, but it requires Java 1.5 or better be installed on the computer. The associated MER Spirit/Opportunity Clock Applet requires only Java 1.1.8 and is compatible with many older web browsers, but it does not include Mars Phoenix timing or the sunclock or other graphic displays of Mars24.

Download Mars24

• Mars24 for Mac OS X
• Mars24 for Windows
• Mars24 "Generic" for Linux, OS/2, etc.

• View MER Spirit/Opportunity Clock Applet (70 kB, requires Java 1.1.8)

Documentation and Credits

Other information available here includes:

• Help
• User's Guide
• Technical Notes on Mars Time
• Algorithm and Worked Examples
• FAQ
• Acknowledgments
• License
• Version History

Also on the GISS website is a 1998 Science Brief, "Telling Time on Mars".

For the latest about Mars Phoenix, see the official Mars Phoenix website.

For the latest news about Spirit and Opportunity, see the official NASA Mars Rovers website.

Contact

If you wish to be notified when new versions of G.Projector are released, if you would like to report a bug, or if you would like to become a G.Projector beta tester, please contact Dr. Robert B. Schmunk.

If you have technical questions about the definition of Mars Solar Time and the mathematical algorithm adopted for its calculation by Mars24, please e-mail Dr. Michael Allison.