Last change
on this file since 11169 was 731, checked in by tbretz, 24 years ago |
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1 | #include "slalib.h"
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2 | #include "slamac.h"
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3 | void slaDtp2s ( double xi, double eta, double raz, double decz,
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4 | double *ra, double *dec )
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5 | /*
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6 | ** - - - - - - - - -
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7 | ** s l a D t p 2 s
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8 | ** - - - - - - - - -
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9 | **
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10 | ** Transform tangent plane coordinates into spherical.
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11 | **
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12 | ** (double precision)
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13 | **
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14 | ** Given:
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15 | ** xi,eta double tangent plane rectangular coordinates
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16 | ** raz,decz double spherical coordinates of tangent point
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17 | **
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18 | ** Returned:
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19 | ** *ra,*dec double spherical coordinates (0-2pi,+/-pi/2)
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20 | **
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21 | ** Called: slaDranrm
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22 | **
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23 | ** Last revision: 3 June 1995
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24 | **
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25 | ** Copyright P.T.Wallace. All rights reserved.
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26 | */
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27 | {
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28 | double sdecz, cdecz, denom;
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29 |
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30 | sdecz = sin ( decz );
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31 | cdecz = cos ( decz );
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32 | denom = cdecz - eta * sdecz;
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33 | *ra = slaDranrm ( atan2 ( xi, denom ) + raz );
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34 | *dec = atan2 ( sdecz + eta * cdecz, sqrt ( xi * xi + denom * denom ) );
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35 | }
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