Planetary data for Earth
mean distance from Sun149,600,000 km (1.0 AU)
eccentricity of orbit0.0167
inclination of orbit to ecliptic0.000°
Earth year (sidereal period of revolution)365.256 days
mean orbital velocity29.79 km/sec
equatorial radius6,378.14 km
polar radius6,356.78 km
surface area510,066,000 km2
mass5.976 × 1024 kg
mean density5.52 g/cm3
mean surface gravity980 cm/sec2
escape velocity11.2 km/sec
rotation period (Earth sidereal day)23.9345 hr (23 hr 56 min 4 sec) of mean solar time
Earth mean solar day24.0657 hr (24 hr 3 min 57 sec) of mean sidereal time
inclination of Equator to orbit23.45°44°
magnetic field strength at Equator0.3 gauss (but weakening)
dipole moment7.9 × 1025 gauss/cm3
tilt angle of magnetic axis11.5°
atmospheric composition (by volume)molecular nitrogen, 78%; molecular oxygen, 21%; argon, 0.93%; carbon dioxide, 0.037% (presently rising); water, about 1% (variable)
mean surface pressure1 bar
mean surface temperature288 K (59 °F, 15 °C)
number of known moons1 (the Moon)