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Geography

Basic facts on Earth

Characteristics

Value

Orbital period

365.256363004 days

Average orbital speed

29.78 km/s(107200 km/h)

Mean sidereal day

23 hours, 56 minutes, 4.0916 seconds.

Mean radius

6371.0 km

Equatorialradius

6378.1 km

Polarradius

6356.8 km

Circumference

40075.017 km (equatorial)

40007.86 km (meridional)

Surface area

510072000 km2

148940000 km2 (29.2%) land

361132000 km2 (70.8%) water

Volume

1.08321×1012 km3

Mass

5.97219×1024 kg(3.0×10-6solar mass)

Mean density

5.514 g/cm3

Surface gravity

9.807 m/s2

Escape velocity

11.186 km/s

Sidereal rotation period

0.99726968 d(23h 56m 4.100s)

Equatorial rotation velocity

1,674.4 km/h (465.1 m/s)

Axial tilt

23 degrees 26 min 21.4119 sec.

Surface pressure

101.325 kPa(at MSL)

Atmospheric Composition by volume

78.08% nitrogen(N2)(dry air)

20.95% oxygen(O2)

0.930% argon

0.039% carbon dioxide

~ 1% water vapor (climate-variable)