mirror of
https://github.com/eddyem/BTA_lib.git
synced 2025-12-06 02:35:20 +03:00
60 lines
1.6 KiB
Fortran
60 lines
1.6 KiB
Fortran
SUBROUTINE sla_TP2S (XI, ETA, RAZ, DECZ, RA, DEC)
|
|
*+
|
|
* - - - - -
|
|
* T P 2 S
|
|
* - - - - -
|
|
*
|
|
* Transform tangent plane coordinates into spherical
|
|
* (single precision)
|
|
*
|
|
* Given:
|
|
* XI,ETA real tangent plane rectangular coordinates
|
|
* RAZ,DECZ real spherical coordinates of tangent point
|
|
*
|
|
* Returned:
|
|
* RA,DEC real spherical coordinates (0-2pi,+/-pi/2)
|
|
*
|
|
* Called: sla_RANORM
|
|
*
|
|
* P.T.Wallace Starlink 24 July 1995
|
|
*
|
|
* Copyright (C) 1995 Rutherford Appleton Laboratory
|
|
*
|
|
* License:
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program (see SLA_CONDITIONS); if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
|
|
* Boston, MA 02111-1307 USA
|
|
*
|
|
*-
|
|
|
|
IMPLICIT NONE
|
|
|
|
REAL XI,ETA,RAZ,DECZ,RA,DEC
|
|
|
|
REAL sla_RANORM
|
|
|
|
REAL SDECZ,CDECZ,DENOM
|
|
|
|
|
|
|
|
SDECZ=SIN(DECZ)
|
|
CDECZ=COS(DECZ)
|
|
|
|
DENOM=CDECZ-ETA*SDECZ
|
|
|
|
RA=sla_RANORM(ATAN2(XI,DENOM)+RAZ)
|
|
DEC=ATAN2(SDECZ+ETA*CDECZ,SQRT(XI*XI+DENOM*DENOM))
|
|
|
|
END
|