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Diffstat (limited to 'math/slalib/doc/etrms.hlp')
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diff --git a/math/slalib/doc/etrms.hlp b/math/slalib/doc/etrms.hlp new file mode 100644 index 00000000..bc14b655 --- /dev/null +++ b/math/slalib/doc/etrms.hlp @@ -0,0 +1,35 @@ +.help etrms Jun99 "Slalib Package" +.nf + + SUBROUTINE slETRM (EP, EV) + + - - - - - - + E T R M + - - - - - - + + Compute the E-terms (elliptic component of annual aberration) + vector (double precision) + + Given: + EP dp Besselian epoch + + Returned: + EV dp(3) E-terms as (dx,dy,dz) + + 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. + + References: + 1 Smith, C.A. et al., 1989. Astr.J. 97, 265. + 2 Yallop, B.D. et al., 1989. Astr.J. 97, 274. + + P.T.Wallace Starlink 23 August 1996 + + Copyright (C) 1996 Rutherford Appleton Laboratory + Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. + +.fi +.endhelp |