Infobox Planet name Moon background dddddd apsis gee symbol image caption Moon periapsis 363 104 km 0 0024 AU apoapsis 405 696 km 0 0027 AU semimajor 384 399 km eccentricity period synodic period avg speed 1 022 km s inclination 5 145 to the ecliptic between 18 29 and 28 58 to Earth s equator asc node regressing by one revolution in 18 6 years arg peri progressing by one revolution in 8 85 years satellite of Earth flattening equatorial radius 1 738 14 km 0 273 Earths polar radius mean radius circumference equatorial surface area volume mass density surface grav escape velocity sidereal day synchronous rot velocity axial tilt 1 5424 to ecliptic 6 687 to orbit plane albedo 0 136 magnitude 2 5 to 12 9The maximum value is given based on scaling of the brightness from the value of 12 74 given for an equator to Moon centre distance of 378 000 km in the NASA factsheet reference to the minimum Earth Moon distance given there after the latter is corrected for the Earth s equatorial radius of 6 378 km giving 350 600 km The minimum value for a distant new Moon is based on a similar scaling using the maximum Earth Moon distance of 407 000 km given in the factsheet and by calculating the brightness of the earthshine onto such a new Moon The brightness of the earthshine is Radius of Moon s orbit 2 relative to the direct solar illumination that occurs for a full Moon radius equatorial 12 74 mean full Moon angular size 29 3 to 34 1 arcminutes The range of angular size values given are based on simple scaling of the following values given in the fact sheet reference at an Earth equator to Moon centre distance of 378 000 km the angular size is 1896 arcseconds The