| 1 | #include "erfa.h" | 
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| 2 |  | 
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| 3 | void eraEpb2jd(double epb, double *djm0, double *djm) | 
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| 4 | /* | 
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| 5 | **  - - - - - - - - - - | 
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| 6 | **   e r a E p b 2 j d | 
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| 7 | **  - - - - - - - - - - | 
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| 8 | ** | 
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| 9 | **  Besselian Epoch to Julian Date. | 
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| 10 | ** | 
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| 11 | **  Given: | 
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| 12 | **     epb      double    Besselian Epoch (e.g. 1957.3) | 
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| 13 | ** | 
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| 14 | **  Returned: | 
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| 15 | **     djm0     double    MJD zero-point: always 2400000.5 | 
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| 16 | **     djm      double    Modified Julian Date | 
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| 17 | ** | 
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| 18 | **  Note: | 
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| 19 | ** | 
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| 20 | **     The Julian Date is returned in two pieces, in the usual ERFA | 
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| 21 | **     manner, which is designed to preserve time resolution.  The | 
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| 22 | **     Julian Date is available as a single number by adding djm0 and | 
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| 23 | **     djm. | 
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| 24 | ** | 
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| 25 | **  Reference: | 
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| 26 | ** | 
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| 27 | **     Lieske, J.H., 1979, Astron.Astrophys. 73, 282. | 
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| 28 | ** | 
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| 29 | **  Copyright (C) 2013-2017, NumFOCUS Foundation. | 
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| 30 | **  Derived, with permission, from the SOFA library.  See notes at end of file. | 
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| 31 | */ | 
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| 32 | { | 
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| 33 | *djm0 = ERFA_DJM0; | 
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| 34 | *djm  =   15019.81352 + (epb - 1900.0) * ERFA_DTY; | 
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| 35 |  | 
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| 36 | return; | 
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| 37 |  | 
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| 38 | } | 
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| 39 | /*---------------------------------------------------------------------- | 
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| 40 | ** | 
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| 41 | ** | 
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| 42 | **  Copyright (C) 2013-2017, NumFOCUS Foundation. | 
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| 43 | **  All rights reserved. | 
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| 44 | ** | 
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| 45 | **  This library is derived, with permission, from the International | 
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| 46 | **  Astronomical Union's "Standards of Fundamental Astronomy" library, | 
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| 47 | **  available from http://www.iausofa.org. | 
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| 48 | ** | 
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| 49 | **  The ERFA version is intended to retain identical functionality to | 
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| 50 | **  the SOFA library, but made distinct through different function and | 
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| 51 | **  file names, as set out in the SOFA license conditions.  The SOFA | 
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| 52 | **  original has a role as a reference standard for the IAU and IERS, | 
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| 53 | **  and consequently redistribution is permitted only in its unaltered | 
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| 54 | **  state.  The ERFA version is not subject to this restriction and | 
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| 55 | **  therefore can be included in distributions which do not support the | 
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| 56 | **  concept of "read only" software. | 
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| 57 | ** | 
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| 58 | **  Although the intent is to replicate the SOFA API (other than | 
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| 59 | **  replacement of prefix names) and results (with the exception of | 
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| 60 | **  bugs;  any that are discovered will be fixed), SOFA is not | 
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| 61 | **  responsible for any errors found in this version of the library. | 
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| 62 | ** | 
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| 63 | **  If you wish to acknowledge the SOFA heritage, please acknowledge | 
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| 64 | **  that you are using a library derived from SOFA, rather than SOFA | 
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| 65 | **  itself. | 
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| 66 | ** | 
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| 67 | ** | 
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| 68 | **  TERMS AND CONDITIONS | 
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| 69 | ** | 
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| 70 | **  Redistribution and use in source and binary forms, with or without | 
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| 71 | **  modification, are permitted provided that the following conditions | 
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| 72 | **  are met: | 
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| 73 | ** | 
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| 74 | **  1 Redistributions of source code must retain the above copyright | 
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| 75 | **    notice, this list of conditions and the following disclaimer. | 
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| 76 | ** | 
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| 77 | **  2 Redistributions in binary form must reproduce the above copyright | 
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| 78 | **    notice, this list of conditions and the following disclaimer in | 
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| 79 | **    the documentation and/or other materials provided with the | 
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| 80 | **    distribution. | 
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| 81 | ** | 
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| 82 | **  3 Neither the name of the Standards Of Fundamental Astronomy Board, | 
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| 83 | **    the International Astronomical Union nor the names of its | 
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| 84 | **    contributors may be used to endorse or promote products derived | 
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| 85 | **    from this software without specific prior written permission. | 
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| 86 | ** | 
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| 87 | **  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | 
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| 88 | **  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | 
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| 89 | **  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | 
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| 90 | **  FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE | 
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| 91 | **  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | 
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| 92 | **  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | 
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| 93 | **  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 
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| 94 | **  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | 
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| 95 | **  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | 
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| 96 | **  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | 
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| 97 | **  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | 
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| 98 | **  POSSIBILITY OF SUCH DAMAGE. | 
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| 99 | ** | 
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| 100 | */ | 
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