Introduction to the 12-Year Lunar Ephemeris
NASA Reference Publication 1349
Twelve Year Planetary Ephemeris: 1995 - 2006
NASA Goddard Space Flight Center
Planetary Systems Branch
This information is from the NASA GSFC 12-Year Geocentric Ephemeris of the Moon. Artemis Society International Members have had a lot of difficulty with access to the GSFC site, so we are duplicating the ephemeris tables here in the Artemis Data Book.
Geocentric Ephemeris for the Moon
Column Heading Definition/Description
1 Date Calendar Date (Gregorian).
(0 DT) All ephemeris positions are for 00:00:00 DT
(Terrestrial Dynamical Time).
2 RA Apparent Right Ascension of Moon for the true equinox of
(h m s) date (hours, minutes, seconds).
3 Dec Apparent Declination of Moon for the true equinox of date
(d ' ") (degrees, arcminutes, arcseconds).
4 Dist Distance of the Moon in units of 103
5 H.P. Equatorial Horizontal Parallax of the Moon (arcseconds).
6 Diam Apparent Angular Diameter of the Moon (arcseconds).
7 Libration Lunar Libration (optical + physical) in Longitude
8 Libration Lunar Libration (optical + physical) in Latitude
9 Libration Lunar Libration (optical + physical) in Position Angle
10 Sun Sun's Selenographic Colongitude or lunar longitude of
Colng morning terminator (degrees).
11 P.A. Position Angle of the midpoint of the Moon's bright limb,
Limb measured eastwards (counter-clockwise) from the celestial
north point of the lunar disk (degrees).
12 Age Age of the Moon, measured from the instant of New Moon
13 Phase Fractional illuminated area (and diameter) of the
apparent disk of the Moon.
14 Solar Solar Elongation of the Moon. Defined as the angular
Elong position of the Moon with respect to the Sun (degrees).
'E' is east (evening sky) and 'W' is west (morning sky).
12-Year Lunar Ephemeris
NASA Reference Publication 1349 was last revised on 25 July 1996.
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