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Matrix Software > Learng Astrology > Astrophysical Directions > Solar System > The Moon

Learn Astrology

Back to Solar System   |   Back to Astrophysical Direction 

The Moon


Here is some basic data about the Moon:

  • Mean distance from Earth= 384401 km

  • Extreme range 356400406700 km

  • Mean horizontal paralax 3422.60"

  • Eccentricity of orbit = 0.0549

  • Inclination of orbit to ecliptic = 5°08'43"

  • Sidereal period (fixed stars)= 27.321661 ep. days

  • Synodical month (New Moon to New Moon) = 29.5305882 ep. days

  • Anomalistic month perigee to perigee) = 27.5545505 days

  • Tropical month (equinox to equinox) = 27.321582 days

  • Nodical month (node to node) = 27.212220 days

  • Period of Moon's node (nutation, retrograde) = 18.61 tropical years

  • Period of rotation of Moon's perigee (direct) = 8.85 years

  • Moon's sidereal mean daily motion = 13°.176358

  • Mean Transit interval = 24h 50.47m


Main periodic terms in the Moon's motion:

  • Principal elliptic term in longitude 22639"sin g

  • Principal elliptic term in latitude 18461"sin u

  • Evection = 4586"sin (2D-g)

  • Variation = 2370"sin 2D

  • Annual inequality = -669"sin g'

  • Parallactic inequality = -125"sin D, where g = Moon's mean anomaly, g'= Sun's mean anomaly, D = Moon's age and u= distance of mean Moon from ascending node.

  • Inclination of lunar equator to ecliptic = 1°32.5'

  • Inclination of lunar equator to orbit = 6°41'

  • Mean Moon radius= 1738.2 km

  • Moon mass = 1/81.301 mass of Earth

Copyright (c) 1997-99 Michael Erlewine


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