Earth Statistics Mass (kg)5.976e+24 Mass (Earth = 1)1.0000e+00 Equatorial radius (km)6,378.14 Equatorial radius (Earth = 1)1.0000e+00 Mean density (gm/cm^3)5.515 Mean distance from the Sun (km)149,600,000 Mean distance from the Sun (Earth = 1)1.0000 Rotational period (days)0.99727 Rotational period (hours)23.9345 Orbital period (days)365.256 Mean orbital velocity (km/sec)29.79 Orbital eccentricity0.0167 Tilt of axis (degrees)23.45 Orbital inclination (degrees)0.000 Equatorial escape velocity (km/sec)11.18 Equatorial surface gravity (m/sec^2)9.78 Visual geometric albedo0.37 Mean surface temperature15°C Atmospheric pressure (bars)1.013 Atmospheric compositionNitrogenOxygenOther 77% 21% 2%