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precess(coords, from, to [, /julian,
/besselian])
Precesses the equatorial coordinates coords from the
equinox identified by from to the equinox identified by
to. coords must be a numerical array and
must have at least two elements in its first dimension, which are
interpreted as the right ascension and declination, measured in
degrees. from and to are interpreted as
Julian Dates if no keywords are specified, or as Julian years (e.g.,
2000.0 = J2000.0) if /julian is specified, or as semi-Besselian
years (e.g., 1950.0 = B1950.0) if /besselian is specified.
Besselian years are taken to be 365.2421988 days long, and B1950.0
corresponds to JDE 2433282.4235.