Computes the E-terms (elliptic component of annual aberration) vector.

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.

void palEtrms ( double ep, double ev[3] );

ep = double (Given)

ev = double [3] (Returned)

• Smith, C.A. et al., 1989. Astr.J. 97, 265.

• Yallop, B.D. et al., 1989. Astr.J. 97, 274.