NASA Reference Publication 1349

Twelve Year Planetary Ephemeris: 1995 - 2006

Fred Espenak

SECTION 1: Geocentric Ephemeris for the Sun

 Column  Heading      Definition/Description

          
     1      Date          Calendar Date (Gregorian). 
           (0 DT)         All ephemeris positions are for 00:00:00 DT
                          (Terrestrial Dynamical Time).     
               
     
     2       JD           Abbreviated Julian Date. To convert to full Julian Date,
          (2440000+)      add 2440000. Julian Date is defined as the number of days
                          elapsed since Greenwich Mean Noon on 0 January 4713 BC.
               

     3      GST           Greenwich Mean Siderial Time at 00:00:00 DT (Terrestrial
          (0 DT)          Dynamical Time).


     4       RA           Apparent Right Ascension of the Sun for the true equator
          (h  m  s)       and equinox of date (hours, minutes, seconds).
     

     5      Dec           Apparent Declination of the Sun for the true equator and
          (d  '  ")       equinox of date (degrees, arc-minutes, arc-seconds).
     

     6     Delta          Distance of the Sun from Earth in astronomical units (1
          (a.u.)          a.u. = 1.496x108 km).


     7      RV            Geocentric Radial Velocity of the Sun (kilometers per
          (km/s)          second).
     

     8     Diam           Apparent Angular Diameter of the Sun (arc-seconds).
           (")

     9     Hel.           Heliographic Latitude of the central point of the solar
           Lat            disk (degrees).
     

     10     Hel.          Heliographic Longitude of the central point of the solar
            Long          disk (degrees).


     11     P.A.          Position Angle of the Sun's rotation axis, measured
            Axis          eastwards (counter-clockwise) from the celestial north
                          point of the solar disk (degrees).

Geocentric Ephemeris for the Sun

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