NASA Reference Publication 1349

Twelve Year Planetary Ephemeris: 1995 - 2006

Fred Espenak

SECTION 2: 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
          (1000*km)       kilometers.

     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
              l           (degrees).     

     8    Libration       Lunar Libration (optical + physical) in Latitude
              b           (degrees).

     9    Libration       Lunar Libration (optical + physical) in Position Angle
              c           (degrees).

     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
          (days)          (days).

     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).

Geocentric Ephemeris for the Moon

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Webmaster: Fred Espenak Planteary Systems Laboratory - Code 693 Email: espenak@lepvax.gsfc.nasa.gov NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA