some mars calender points of interests...

1. every unit of time will be 1.0275 times longer than its terrestrial counterpart, but we will use the same named units and structure.

2. The martian year is 669 martian days.

3. Since mars has an elliptical orbit, its seasons are of unequal length with 66 martian days in Leo (Leo 24 being aphelion 'farthest away from the sun') to 46 martian days in Aquarius (Aquarius 16 being perihelion "nearest to the sun')

4. The dust storm season on mars starts in Capricorn and last until Aries. Dust storms are caused by carbon dioxide being released into the atmosphere from the melting frozen antarctic during the relative hot southern spring and summer (it's much closer to the sun than the rest of the year) creating the atmospheric pressure of the planet to raise about 12 percent in the course of a few months. This causes the high wind dust storms that start at the south pole and spread north throughout the southern summer season, sometimes engulfing the entire planet.