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author | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-03-04 21:21:30 -0500 |
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committer | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-03-04 21:21:30 -0500 |
commit | d54fe7c1f704a63824c5bfa0ece65245572e9b27 (patch) | |
tree | afc52015ffc2c74e0266653eecef1c8ef8ba5d91 /src/slalib/ecleq.f | |
download | calfuse-d54fe7c1f704a63824c5bfa0ece65245572e9b27.tar.gz |
Initial commit
Diffstat (limited to 'src/slalib/ecleq.f')
-rw-r--r-- | src/slalib/ecleq.f | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/slalib/ecleq.f b/src/slalib/ecleq.f new file mode 100644 index 0000000..5aa93c9 --- /dev/null +++ b/src/slalib/ecleq.f @@ -0,0 +1,55 @@ + SUBROUTINE sla_ECLEQ (DL, DB, DATE, DR, DD) +*+ +* - - - - - - +* E C L E Q +* - - - - - - +* +* Transformation from ecliptic coordinates to +* J2000.0 equatorial coordinates (double precision) +* +* Given: +* DL,DB dp ecliptic longitude and latitude +* (mean of date, IAU 1980 theory, radians) +* DATE dp TDB (loosely ET) as Modified Julian Date +* (JD-2400000.5) +* Returned: +* DR,DD dp J2000.0 mean RA,Dec (radians) +* +* Called: +* sla_DCS2C, sla_ECMAT, sla_DIMXV, sla_PREC, sla_EPJ, sla_DCC2S, +* sla_DRANRM, sla_DRANGE +* +* P.T.Wallace Starlink March 1986 +* +* Copyright (C) 1995 Rutherford Appleton Laboratory +*- + + IMPLICIT NONE + + DOUBLE PRECISION DL,DB,DATE,DR,DD + + DOUBLE PRECISION sla_EPJ,sla_DRANRM,sla_DRANGE + + DOUBLE PRECISION RMAT(3,3),V1(3),V2(3) + + + +* Spherical to Cartesian + CALL sla_DCS2C(DL,DB,V1) + +* Ecliptic to equatorial + CALL sla_ECMAT(DATE,RMAT) + CALL sla_DIMXV(RMAT,V1,V2) + +* Mean of date to J2000 + CALL sla_PREC(2000D0,sla_EPJ(DATE),RMAT) + CALL sla_DIMXV(RMAT,V2,V1) + +* Cartesian to spherical + CALL sla_DCC2S(V1,DR,DD) + +* Express in conventional ranges + DR=sla_DRANRM(DR) + DD=sla_DRANGE(DD) + + END |