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document updated 19 years ago, on Aug 16, 2005
study
THIS
for a long long time. And
this
. And if you need lots of math,
this
.
various
celestial coordinate system
(
category
) are used, both for time and location. The
ICRS
seems to be primary among these.
the main frame of reference is the
equatorial coordinate system
the main time coordinate seems to be
J2000
There are various
astrometric catalogs
available also,
NOMAD
seems to be primary among these (even simply studying the
definition of the data columns
can be very educational)
and then there's all that sidereal stuff (
s-time
,
s-year
)
when doing orbital math, there are
some simplifications
that can make things much easier