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                         IMCCE - Observatoire de Paris

                                    SEASONS

                                1998, September
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/pub/ephem/sun/seasons   (Gerard Francou)


CONTENTS :

Solstices and Equinoxes between 1900 and 2999 in dynamical time.

Equinoxes:
The apparent geocentric longitude of the Sun is equal to 0 degree for
the Spring equinox and equal to 180 degrees for the Automn equinox.

Soltices :
The apparent geocentric longitude of the Sun is equal to 90 degrees for
the Summer solstice and equal to 270 degrees for the Winter solstice.


SOURCE :

The seasons are computed with a truncated version of the planetary
theory VSOP87 :
Bretagnon P., Francou G.
Astron. Astrophys. 202, 309 (1988).


FILES :

1900-49 : Seasons between 1900 and 1949.
1950-99 : Seasons between 1950 and 1999.
2000-49 : Seasons between 2000 and 2049.
2050-99 : Seasons between 2050 and 2099.

End of document