Average distance of Moon from Earth |
384 401 km = 60.27 Earth's Equatorial Radii |
Minimum distance of Moon at Perigee |
356 400 km |
Maximum distance of Moon at Apogee |
406 700 km |
Time taken for light to travel from Moon to Earth |
1.3 seconds |
Eccentricity of Moon's orbit around Earth |
0.0549 |
Mean distance of center of gravity of Earth-Moon system from center of Earth |
4 670 km |
Mean angular diameter of Moon in sky (geocentric) |
31' 05.2" |
Angular diameter of Moon at perigee |
33' 28.8" |
Angular diameter of Moon at apogee |
29' 23.2" |
Stellar magnitude of full Moon |
-12.55 mag |
Inclination of Moon's orbit to ecliptic |
5º 8' 43.4" |
Sidereal orbital period (i.e., with respect to stars) |
27.321661d = 27d 7h 43m 11.5s |
Synodic month (from new Moon to new Moon) |
29.530588d = 29d 12h 44m 2.8s |
Anomalistic month (from perigee to perigee) |
27.554550d = 27d 13h 18m 33.1s |
Rotation period of line of nodes (retrograde motion) |
18.61 years |
Rotation period of point of perigee (direct motion) |
8.85 years |
Average orbital velocity of Moon around Earth |
3 681 km/h = 1 023 km/s |
Average angular velocity of Moon's motion in sky |
33'/h |
Mean diurnal motion of Moon with respect to stars |
13.176358º |
Mean interval between two successive meridian passages of Moon |
24h 50.47m |
Optical libration in longitude |
up to 7º 54' |
Optical libration in latitude |
up to 6º 50' |
Total surface area of the Moon theoretically observable from Earth |
59% |
Inclination of Moon's equator to plane of ecliptic |
1º 32.5' |
Inclination of Moon's equator to its orbital plane |
6º 41' |
Diameter of Moon |
3 476 km |
Circumference of Moon at equator |
10 920 km |
Surface area of the Moon |
37.96 x 10^6 km2 = 7.4% of surface area of Earth |
Volume of the Moon |
21.99 x 10^9 km3 = 2.03% of volume of Earth |
Mass of Moon |
7.352 x 10^25 g = 1.23% of mass of Earth |
Mean density of Moon |
3.341 g/cm3 = 60.6% of density of Earth |
Moon's surface gravity |
162.2 cm/s2 = 16.5% of Earth's surface gravity |
Moon's escape velocity |
2.38 km/s (11.2 km/s on Earth) |
Illumination of surface of Earth by Full Moon |
0.25 lux |
Illumination of surface of Moon by full Earth |
16 lux |
Surface temperature on night hemisphere of Moon |
-170º to -185º C |
Maximum temperature on sunlit side of the Moon |
+130º C |
Constant temperature at depth of 1 m under surface |
-35º C |
Total surface of lunar maria |
16.9% of Moon's surface |
Total surface area of lunar maria on near side of the Moon (one hemisphere) |
31.2% of near side of Moon |
Total surface area of lunar maria on far side of the Moon (one hemisphere) |
2.6% of far side of Moon |
Range of topography (highest-lowest elevation on the Moon) |
16 km |