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diff --git a/math/slalib/doc/addet.hlp b/math/slalib/doc/addet.hlp new file mode 100644 index 00000000..464dd86a --- /dev/null +++ b/math/slalib/doc/addet.hlp @@ -0,0 +1,42 @@ +.help addet Jun99 "Slalib Package" +.nf + + SUBROUTINE slADET (RM, DM, EQ, RC, DC) + + - - - - - - + A D E T + - - - - - - + + Add the E-terms (elliptic component of annual aberration) + to a pre IAU 1976 mean place to conform to the old + catalogue convention (double precision) + + Given: + RM,DM dp RA,Dec (radians) without E-terms + EQ dp Besselian epoch of mean equator and equinox + + Returned: + RC,DC dp RA,Dec (radians) with E-terms included + + Note: + + Most star positions from pre-1984 optical catalogues (or + derived from astrometry using such stars) embody the + E-terms. If it is necessary to convert a formal mean + place (for example a pulsar timing position) to one + consistent with such a star catalogue, then the RA,Dec + should be adjusted using this routine. + + Reference: + Explanatory Supplement to the Astronomical Ephemeris, + section 2D, page 48. + + Called: slETRM, slDS2C, slDC2S, slDA2P, slDA1P + + P.T.Wallace Starlink 18 March 1999 + + Copyright (C) 1999 Rutherford Appleton Laboratory + Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. + +.fi +.endhelp |