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SUN: Age : About 5 Billion years
Distance : 149.8 Million Kms
Diameter : 1,38,400 Kms.
Photosphere temperature : 5,770 K
Core temperature : 150,000,000 K
Absolute visual magnitude : 4.75
Rotation (as seen from the earth at the equator) : 25.38 days
Rotation (near the poles) : 33 days
The sun consists of 71% of Hydrogen, 26.5% Helium and 2.5% of other elements. The rays of the Sun take about 8 minutes to reach the earth.
EARTH :
Equatorial diameter : 12,756 Kms.
Polar diameter : 12,714 Kms.
Distance from the Sun : 149,597,900 Kms.
Period of revolution : 365 days 5 hrs, 48 mts, 45.51 sec.
Period of rotation : 23 hrs 56 mts. 4.09 sec.
Surface Area : 510,100,500 Sq.Kms.
Land Surface : 148,950,800 Sq.Kms. (29.08%)
Water Surface : 361,149,700 Sq.Kms. (70.92%)
Equatorial circumference : 40,075 Kms.
Polar circumference : 40,008 Kms
Escape Velocity from the earth : 11 Km per Sec. (minimum)
The seasons are due to the change of the Earth’s position in the course of its revolution about the Sun, and to the inclination of its axis. The Equator is an imaginary line drawn round the Earth midway between the Poles. There are two other lines, namely, Tropic of Cancer (23½O N) and the Tropic of Capricon (23½O S). The word tropic means, ‘turning place’. The inclination of the Earth’s axis together with its revolution round the Sun is the cause of the varying length of day and night in different parts of the world.


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