MATHEMATICS OF EARTH
Earth Fact Sheet
Our Earth is the only planet known to have life supporting environment and is the third planet from the sun. The Earth has only one natural satellite i.e. our Moon. An Earth year is about 365.26 days long. 71% of the Earth surface is covered with water and the land constitute only 29% of the Earth surface.
Bulk parameters
Volume (1010 km3) 108.321
Equatorial radius (km) 6378.137
Polar radius (km)
6356.752
Volumetric mean radius (km)
6371.008
Core radius (km)
3485
Ellipticity (Flattening)
0.00335
Mean density (kg/m3) 5514
Surface gravity (m/s2) 9.798
Surface acceleration (m/s2) 9.780
Escape velocity (km/s)
11.186
GM (x 106 km3/s2) 0.39860
Bond albedo
0.306
Geometric albedo
0.434
V-band magnitude V(1,0)
-3.99
Solar irradiance (W/m2) 1361.0
Black-body temperature (K)
254.0
Topographic range (km)
20.4
Moment of inertia (I/MR2) 0.3308
J2 (x 10-6) 1082.63
Number of natural satellites
1
Planetary ring system
No
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