Compute the e-terms (elliptic component of annual aberration) vector. (double precision)
ep double Besselian epoch
ev double[3] e-terms as (dx,dy,dz)
1 Smith, C.A. et al, 1989. "The transformation of astrometric catalog systems to the equinox J2000.0". Astron.J. 97, 265. 2 Yallop, B.D. et al, 1989. "Transformation of mean star places from FK4 B1950.0 to FK5 J2000.0 using matrices in 6-space". Astron.J. 97, 274. Note the use of the J2000 aberration constant (20.49552 arcsec). This is a reflection of the fact that the e-terms embodied in existing star catalogues were computed from a variety of aberration constants. Rather than adopting one of the old constants the latest value is used here. Defined in slamac.h: DAS2R P.T.Wallace Starlink 31 October 1993