Jonathan Breitzer Sandhills Astronomical Society June 11, 2008

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Jonathan Breitzer Sandhills Astronomical Society June 11, 2008 A Martian Calendar Jonathan Breitzer Sandhills Astronomical Society June 11, 2008

Relevant Data Inclination of Axis: 25.19° Siderial Day: 24h 37m 22s Year (see next slide) Solar Day: 24h 39m 35.24409s Vernal equinox: 85° (heliocentric) RA = 317.681 – 0.108T ; Dec = +52.886 – 0.061T; T in Julian centuries http://www.seds.org/~spider/spider/Mars/marsdata.html

Martian Year Earth Mars, days Mars, sols Seasons Spring 92.764 198.61 193.3      Summer 93.647 183.55 178.64      Autumn 89.836 146.62 142.7      Winter 88.997 158.18 153.95 Anomalistic year 365.26 686.9957 668.615 Sidereal year 365.256 686.9797 668.599 Vernal equinox year 365.242 686.971 668.591 Summer solstice year 686.9683 668.588 Autumnal equinox year 686.9745 668.594 Winter solstice year 365.243 686.9763 668.596 Tropical year 686.9725 668.592

♈ ♈ ♂ (P) E

Darian calendar Sagittarius 28 Pisces Gemini Virgo Dhanus Mina Mithuna Kanya Capricornus Aries Cancer Libra Makara Mesha Karka Tula Aquarius Taurus Leo Scorpius Kumbha 27 Rishabha Simha Vrishika 167 668 Inventor: Thomas Gangale

Leap Year Rule (Y-1)\2 + Y\10 - Y\100 + Y\1000 http://pweb.jps.net/~tgangale/mars/mst/darian.htm

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