Remove the E-terms (elliptic component of annual aberration) from a pre IAU 1976
give a mean place.
CALL sla_SUBET (RC, DC, EQ, RM, DM)
E-terms included (radians)
Besselian epoch of mean equator and equinox
Most star positions from pre-1984 optical catalogues (or obtained by astrometry with
respect to such stars) have the E-terms built-in. This routine converts such a position to a
formal mean place (allowing, for example, comparison with a pulsar timing position).
Explanatory Supplement to the Astronomical Ephemeris, section 2D, page 48.