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[task #16282] Include ICRS equatorial coordinate type

From: Mohammad Akhlaghi
Subject: [task #16282] Include ICRS equatorial coordinate type
Date: Mon, 24 Oct 2022 19:06:06 -0400 (EDT)

Follow-up Comment #1, task #16282 (project gnuastro):

A nice review of ICRS in relation to FK5 and J2000 is given in Feissel and
Mignard 1998 <>. In
their Figure 1, they show the pole positions in relation to each other. 

We should be able to use these pole positions to convert ICRS to 'eq-j2000'
and from that, to all the other coordinate systems that are currently

Some other references: 
* Kaplan 2005 <>: a nice review from
the basics and some good history.
* Charlot et al. 2020 <>: the third
realization of ICRS.


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