Last change
on this file since 9223 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 slaDs2c6 ( double a, double b, double r, double ad,
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4 | double bd, double rd, double v[6] )
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5 | /*
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6 | ** - - - - - - - - -
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7 | ** s l a D s 2 c 6
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8 | ** - - - - - - - - -
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9 | **
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10 | ** Conversion of position & velocity in spherical coordinates
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11 | ** to Cartesian coordinates.
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12 | **
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13 | ** (double precision)
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14 | **
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15 | ** Given:
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16 | ** a double longitude (radians)
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17 | ** b double latitude (radians)
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18 | ** r double radial coordinate
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19 | ** ad double longitude derivative (radians per unit time)
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20 | ** bd double latitude derivative (radians per unit time)
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21 | ** rd double radial derivative
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22 | **
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23 | ** Returned:
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24 | ** v double[6] Cartesian position & velocity vector
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25 | **
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26 | ** Last revision: 16 November 1993
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27 | **
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28 | ** Copyright P.T.Wallace. All rights reserved.
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29 | */
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30 | {
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31 | double sa, ca, sb, cb, rcb, x, y, rbd, w;
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32 |
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33 | /* Useful functions */
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34 | sa = sin ( a );
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35 | ca = cos ( a );
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36 | sb = sin ( b );
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37 | cb = cos ( b );
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38 | rcb = r * cb;
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39 | x = rcb * ca;
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40 | y = rcb * sa;
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41 | rbd = r * bd;
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42 | w = rbd * sb - cb * rd;
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43 |
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44 | /* Position */
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45 | v[0] = x;
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46 | v[1] = y;
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47 | v[2] = r * sb;
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48 |
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49 | /* Velocity */
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50 | v[3] = -y * ad - w * ca;
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51 | v[4] = x * ad - w * sa;
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52 | v[5] = rbd * cb + sb * rd;
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53 | }
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