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:
- Earth symbol ⊕ = E
- Moon ☽ = Mo
- gravitational constant G = 6.67408(31)*10**(-11) (MKS units)
- Earth mass M_⊕ = 5.9722*10**24 kg = 81.3005677 M_moon
- Earth equatorial radius R_eq_⊕ = 6378.1370 km
- Earth mean radius R_me_⊕ = 6371.0088 km
- Earth polar radius R_po_⊕= 6356.7523 km
- Moon mass M_Mo = 7.342*10**22 kg
= 0.0123000371 M_⊕ = 1/81.3005678 M_⊕ ≅ 1/80 M_⊕
- 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_⊕
- 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?).
- axial tilt to the
ecliptic pole = 1.5424°
which is much less than the
Earth's axial tilt = 23.439281°
(J2000?).
- Moon mean orbital radius R_Mo = 384,748 km
= 60.3229 R_eq_⊕ ≅ 60 R_eq_⊕
- Moon orbital eccentricity = 0.0549006 (mean) ≅ 5.5 %
- Moon orbital inclination = 5.145° (mean)
- lunar month = 29.530588861 days (J2000)
≅ 29.53059 days (mean J2000 to 7 digits) ≅ 29.5 days:
The new moon
to new moon period.
- 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.
- 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.
Image 2 Caption:
Earth and
Moon numbers
(Cox-16,240,303,305).
See also
Moon keywords below
(local link /
general link: moon_keywords.html):
php require("/home/jeffery/public_html/astro/moon/moon_keywords.html");?>
Images:
- 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.
- Credit/Permission: ©
David Jeffery,
2004 / Own work.
Image link: Itself.
Local file: local link: moon_facts.
File: Moon file:
moon_facts.html.