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|+THE EARTH. |- ||Volume, ||1.000 |- ||Mass (Sun's = 1), ||0.0000028173 |- ||Density (water = 1), ||5.6747 |- ||Diameter, mean, in miles, ||7916 |- ||Diameter— — — polar, in miles, ||7898 |- ||Diameter— — — equatorial, in miles, ||7924 |- ||Circumference in miles, ||25,000 |- ||In one second of time bodies fall, latitude of London, in feet, ||16.835 |- ||Centrifugal force at equator (gravity = 1), ||0.00346 |- ||Times rotation requires to be increased to neutralise gravity at equator, ||17 |- ||Period of rotation in sidereal hours, ||24 |- ||Length of a mean solar day in sidereal time, ||24^h. 3^m.- 56^s..55 |- ||Length of a— — — sidereal day in mean solar time, ||23^h. 56^m. 4^s.09 |- ||Daily acceleration of sidereal time in mean solar time, ||3^m. 55^s..09 |- ||Greatest difference between the mean and apparent solar time, ||16^m. 16^s. |- ||Greatest height of mountains in miles, ||5 |- ||Axis of the poles (axis of diameter of equator = 305), ||304 |- ||Greatest depth of ocean in miles, ||9 |- ||Mean distance from the Sun (Earth's radius = 1), ||23,984 |- ||Mean distance from the Sun— — — in miles, ||95,000,000 |- ||Distance at perihelion (mean distance = 1), ||.9832 |- ||distance at— — — aphelion (mean distance = 1), . ||1.0168 |- ||Eccentricity (semi-major axis = 1), ||0.016783568 |- ||Sidereal revolution in mean solar days. ||365^d. 6^h. 9^m. 9^s..6 |- ||Anomalistic revolution in mean solar days. ||365^d. 6^h. 13^m. 49^s. |- ||Tropical revolution in mean solar days, ||365^d. 5^h. 48^m. 49^s..7 |- ||Interval between vernal and autumnal equinoxes, ||186^d. 11^h. 34^m. |- ||Interval between autumnal and vernal equinoxes, ||178^d. 18^h. 7^m. |}