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

2. Relevant Data Inclination of Axis: 25.19° Siderial Day: 24h 37m 22s
Year (see next slide)
Solar Day: 24h 39m s
Vernal equinox: 85° (heliocentric)
RA = – 0.108T ; Dec = – 0.061T; T in Julian centuries

3. 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
Sidereal year
Vernal equinox year
Summer solstice year
Autumnal equinox year
Winter solstice year
Tropical year

4. ♈ ♈ ♂
(P) E

5. 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

6. Leap Year Rule (Y-1)\2 + Y\10 - Y\100 + Y\1000