Mars24 Sunclock — Time on Mars
We thank members of the Mars Climate Orbiter and Mars Exploration Rover projects at NASA's Jet Propulsion Laboratory for their encouragement over many years on behalf of the development of our solar timing algorithms and Mars24 sunclock.
We thank members of the Mars Phoenix project at NASA JPL and the University of Arizona for their assistance with recent updates to Mars24.
The sample map images included in Mars24 for its sunclock maps were originally created by the Mars Global Surveyor MOLA and MOC teams. The the faux realistic image was created for the National Geographic Society. See the MOLA science website at the NASA Goddard Space Flight Center for more info.
Mars24 includes Java software developed by the JDOM Project and which is copyright 2000-2003 Jason Hunter and Brett McLaughlin. For more information about JDOM, including source code and conditions of use, please see the JDOM homepage.
Mars24 uses Java QuantizeFilter software by Jerry Huxtable. For more information, including source code, please see the JH Labs website.
Mars24 used Java iText-PDF software by Bruno Lowagie and Paulo Soares. For more information, including source code, please see the iText website.
Mars24 is primarily based on algorithms published in:
- Allison, M. 1997: Accurate analytic representations of solar time and seasons on Mars with applications to the Pathfinder/Surveyor missions. Geophys. Res. Lett. 24, 1967-1970, doi:10.1029/97GL01950.
- Allison, M., and M. McEwen 2000: A post-Pathfinder evaluation of aerocentric solar coordinates with improved timing recipes for Mars seasonal/diurnal climate studies. Planet. Space Sci. 48, 215-235.
Some updates and adjustments, including mission time calculations, were made based on:
- Allison, M., and J. Ferrier: Planetocentric solar coordinates, including efficient recipes for seasonal/diurnal timing on Saturn and Titan. Unsubmitted paper.
- Roncoli, R., B. Strauss, and D. Highsmith 2002: Mars Exploration Rover Project planetary constants and models - Version 2. Interoffice Memorandum IOM 312.F-02-003. NASA Jet Propulsion Laboratory
- Seidelmann, P.K., V K. Abalaki, M. Burs, M E. Davies, C. de Bergh, J.H. Lieske, J. Oberst, J.L. Simon, E.M. Standish, P. Stooke, and P.C. Thomas 2002: Report of the IAU/IAG Working Group on cartographic coordinates and rotational elements of the planets and satellites: 2000. Celest. Mech. Dynam. Astron. 82, 83-110, doi:10.1023/A:1013939327465. (Also cf., Corrigendum, 2002. Celest. Mech. Dynam. Astron. 84, 429, doi:10.1023/A:1021101631766.)
Other works useful in the development of the algorithm and software included:
- De Vaucouleurs, G., M.E. Davies, and F.M. Sturms 1973: Mariner 9 areographic coordinate system. J. Geophys. Res. 78, 4395-4404.
- Duxbury, T., R.L. Kirk, B.A. Archinal 2001: Mars Geodesy/Cartography Working Group recommendations on Mars cartographic constants and coordinate systems. International Society for Photogrammatry and Remote Sensing (ISPRS) Working Group Meeting IV/9.
- Folkner, W.M., C.F. Yoder, D.N. Yuan, E.M. Standish, and R.A. Preston 1997: Interior structure and seasonal mass redistribution of Mars from radio tracking of Mars Pathfinder. Science 278, 1749-1751, doi:10.1126/science.278.5344.1749.
- Simon, J.L., P. Bretagnon, J. Chapront, M. Chapront-Touzé, G. Francour, and J. Lasker 1994: Numerical expressions for precession formulae and mean elements for the Moon and planets. Astron. Astrophys. 282, 663-683.