Codes for SimEarth				
------------------
						Venus	Earth	Mars
Year			Earth days		224.7	365.26	687
Day			Earth hours		243	23h 65m	24h 37m
Diameter		km			12100	12754	6796
Diameter		miles			523	7926	4220
Avg. Temp		C			477	13	-53
Density			water = 1		5.24	5.52	3.94
Moons						0	1	2
Surface 		Gravity	Earth = 1	.9	1	.38
Mass			x1e13 Gtons		4.89	6.04	.642
Axial tilt					177.3	23.45	25.19
Volume			Earth = 1		0.88	1	.15
Distance from Sun	1e6 km			108.2	149.6	227.9
Distance from Sun	1e6 miles		67.24	93	141.73
Orbital Velocity	km/sec			35	29.8	24.1
