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Malik Kaliami
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Earth

by Malik Kaliami on April 17, 2012

From Wikipedia, the free encyclopedia
This article is about the planet. For other uses, seeEarth (disambiguation).

EarthAstronomical symbol of Earth
A planetary disk of white cloud formations, brown and green land masses, and dark blue oceans against a black background. The Arabian peninsula, Africa and Madagascar lie in the upper half of the disk, while Antarctica is at the bottom.
"The Blue Marble" photograph of Earth,
taken fromApollo 17
Designations
Alternate name(s) Terra, Sol-3
Epoch J2000.0[note 1]
Aphelion 152,098,232 km
1.01671388 AU[note 2]
Perihelion 147,098,290 km
0.98329134 AU[note 2]
Semi-major axis 149,598,261 km
1.00000261 AU[1]
Eccentricity 0.01671123[1]
Orbital period 365.256363004 days[2]
1.000017421 yr
Average orbital speed 29.78 km/s[3]
107,200 km/h
Mean anomaly 357.51716°[3]
Inclination 7.155° toSun'sequator
1.57869°[4]toinvariable plane
Longitude of ascending node 348.73936°[3][note 3]
Argument of perihelion 114.20783°[3][note 4]
Satellites 1 natural (The Moon)
994 artificial (as of 31 December 2011)[5]
Physical characteristics
Mean radius 6,371.0 km[6]
Equatorialradius 6,378.1 km[7][8]
Polarradius 6,356.8 km[9]
Flattening 0.0033528[10]
Circumference 40,075.017 km (equatorial)[8]
40,007.86 km (meridional)[11][12]
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