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.help eqecl Jun99 "Slalib Package"
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SUBROUTINE slEQEC (DR, DD, DATE, DL, DB)
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E Q E C
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Transformation from J2000.0 equatorial coordinates to
ecliptic coordinates (double precision)
Given:
DR,DD dp J2000.0 mean RA,Dec (radians)
DATE dp TDB (loosely ET) as Modified Julian Date
(JD-2400000.5)
Returned:
DL,DB dp ecliptic longitude and latitude
(mean of date, IAU 1980 theory, radians)
Called:
slDS2C, slPREC, slEPJ, slDMXV, slECMA, slDC2S,
slDA2P, slDA1P
P.T.Wallace Starlink March 1986
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
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.endhelp
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