0.5313
1.8822
687 Earth days = 1.88 Earth years. 365 days in a year so, 687 days -365 days= 322 days: so 687 days=1 year and 322 days 20 years is 7300 days
mars age = earth age* 365 / 687 Mars age= 12*365/687 Mars age = 6.37 Mars years
0.1528
8.4884
17.175
36.5
0.0582
273
343.5
129.926
60.8333