Representations of time coordinates in FITS - Time and relative dimension in space

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Table 3

Standard time reference position values¹.

TOPOCENTER	Topocenter: the location from where the observation was made (default)
GEOCENTER	Geocenter
BARYCENTER	Barycenter of the Solar System
RELOCATABLE	Relocatable: to be used for simulation data only
CUSTOM	A position specified by coordinates that is not the observatory location

Less common allowed standard values are:


HELIOCENTER	Heliocenter
GALACTIC	Galactic center
EMBARYCENTER	Earth-Moon barycenter
MERCURY	Center of Mercury
VENUS	Center of Venus
MARS	Center of Mars
JUPITER	Barycenter of the Jupiter system
SATURN	Barycenter of the Saturn system
URANUS	Barycenter of the Uranus system
NEPTUNE	Barycenter of the Neptune system

Notes.

⁽¹⁾

Recognized values for TREFPOS, TRPOSn; only the first three characters of the values are significant and solar system locations are as specified in the JPL Ephemerides.

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