MATHEMATICS OF EARTH

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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

Mass (1024 kg)                 5.9723
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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