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|+MARS. |- ||Volume (Earth's = 1), ||0.1364 |- ||Mass (Earth's = 1), ||0.1324 |- ||Density (Earth's = 1), ||0.972 |- ||Diameter (Earth's = 1), ||0.519 |- ||Diameter— — — in miles, ||4070 |- ||Diameter— — —, apparent, mean, ||5″.8 |- ||Diameter, apparent,— — — minimum, ||3″.3 |- ||Diameter, apparent,— — — maximum. ||23″-5 |- ||Gravity (Earth's = 1), ||0.49 |- ||In one second of time bodies fall, in feet, ||7.9 |- ||Time of rotation on axis, ||24^h. 37^m. 22^s. |- ||Revolution, sidereal, in days, ||686.97945 |- ||Revolution,— — — synodical. ||779.836 |- ||Light and heat from Sun (Earth's = 1), ||0.43 |- ||Polar less than equatorial diameter. ||1-16th |- ||Distance from the Sun, mean, in miles, ||145,750,000 |- || Distance from the Sun,— — — mean, (Earth's = 1), ||1.523691 |- || Distance from the Sun,— — —maximum, ||1.665779 |- || Distance from the Sun,— — —minimum. ||1.381602 |- ||Eccentricity of orbit (semi-axis major = 1) ||0.93258 |- ||Eccentricity of orbit— — —, annual increase, ||0.00000090176 |- ||Longitude of perihelion, ||332° 23′ 56″.6 |- ||Longitude— — — annual increase, ||15″-8 |- ||Longitude— — — ascending node. ||48° 0′ 3″-5 |- ||Inclination of orbit to ecliptic, ||2″-8 |- ||Inclination of orbit to ecliptic,— — — annual decrease. ||0″.014 |- ||Mean daily motion in orbit. ||31′ 26″-7 |- ||Inclination of axis to the ecliptic, ||59° 41′ 49″ |- ||Greatest arc of retrogradation, ||19° 35′ |- ||Edge of south polar spot from pole in winter, ||35° |- ||Edge of south polar spot from pole— — — in summer. ||5° |- ||Brightness of polar spots (mean brightness = 1), ||2 |}