Moon map Moon image, near side with labels

    Image 1 Caption: An image moon map of the near side of the Moon with the major maria (singular mare, vocalized mar-ray) and lunar craters identified.

    List: Earth-Moon-System Facts:

    1. Earth symbol ⊕ = E
    2. Moon ☽ = Mo
    3. gravitational constant G = 6.67408(31)*10**(-11) (MKS units)

    4. Earth mass M_⊕ = 5.9722*10**24 kg = 81.3005677 M_moon
    5. Earth equatorial radius R_eq_⊕ = 6378.1370 km
    6. Earth mean radius R_me_⊕ = 6371.0088 km
    7. Earth polar radius R_po_⊕= 6356.7523 km

    8. Moon mass M_Mo = 7.342*10**22 kg = 0.0123000371 M_⊕ = 1/81.3005678 M_⊕ ≅ 1/80 M_⊕
    9. Moon radius:
            R_eq_Mo = 1738.14 km = 0.2725 R_eq_⊕
            R_me_Mo = 1737.10 km = 0.2727 R_eq_⊕
            R_po_Mo = 1736.0 km = 0.2731 R_eq_⊕
    10. mean angular diameter = 0.5174° = 31.04' which is almost the same as the Sun's mean angular diameter = 0.5329° = 31.97' (Cox-16,303,305?).
    11. axial tilt to the ecliptic pole = 1.5424° which is much less than the Earth's axial tilt = 23.439281° (J2000?).

    12. Moon mean orbital radius R_Mo = 384,748 km = 60.3229 R_eq_⊕ ≅ 60 R_eq_⊕
    13. Moon orbital eccentricity = 0.0549006 (mean) ≅ 5.5 %
    14. Moon orbital inclination = 5.145° (mean)
    15. lunar month = 29.530588861 days (J2000) ≅ 29.53059 days (mean J2000 to 7 digits) ≅ 29.5 days: The new moon to new moon period.
    16. mean lunar sidereal month 27.321661547 days (J2000) ≅ 27.32166 days (to 7 digits) ≅ 27.3 days: The physical orbital period relative to the observable universe.
    17. lunar anomalistic month = 27.554550 days (mean J2000 to 7 digits) ≅ 27.6 days: The perigee to perigee period. It differs from the mean lunar sidereal month because of astronomical perturbations.

    Note: The ratios made from Earth mass M_⊕ and Moon mass M_Mo are known to higher accuracy/precision than their values are in kilograms (see Wikipedia: Earth mass: Value).

    Keywords: apogee, apsis (apogee, perigee), barycenter, celestial mechanics, center of mass, Earth, eccentricity, fixed stars, inertial frame, J2000, mass, mean orbital radius (AKA semi-major axis), Moon, orbit, (circular orbits, elliptical orbit), orbital inclination, orbital period, planet symbols, perigee, radius, semi-major axis, etc.

    Moon numbers

    Image 2 Caption: Earth and Moon numbers (Cox-16,240,303,305).

    See also Moon keywords below (local link / general link: moon_keywords.html):

      EOF

    Images:
    1. Credit/Permission: © User:Peter Freiman, User:Cmglee, Gregory H. Revera, 2011 / Creative Commons CC BY-SA 3.0.
      Image link: Wikipedia: File:Moon names.svg.
    2. Credit/Permission: © David Jeffery, 2004 / Own work.
      Image link: Itself.
    Local file: local link: moon_facts.
    File: Moon file: moon_facts.html.