MATHEMATICS ENCYCLOPEDIA

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 (10 24 kg)                 5.9723 Volume (10 10 km 3 )             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/m 3 )            5514      Surface gravity (m/s 2 )          9.798  Surface acceleration (m/s 2 )     9.780        Escape velocity (km/s)         11.186 GM (x 10 6 km 3 /s 2 )               0.39860      Bond albedo                     0.306  Geometric albedo                0.434 V-band magnitude