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All positions on the sky ultimately refer to the equatorial
reference system for the mean equinox 2000.0,
with cartesian coordinates 
, and the
equivalent polar coordinate frame under the equatorial system
(Right ascension 
, declination 
).
The ecliptic coordinate system ( 
) was also used
(particularly for the data storage, image, source analysis during
the survey phase), with equivalent polar coordinates
ecliptic longitude ( 
) and latitude ( 
).