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| author | William Joye <wjoye@cfa.harvard.edu> | 2018-09-21 17:04:03 (GMT) |
|---|---|---|
| committer | William Joye <wjoye@cfa.harvard.edu> | 2018-09-21 17:04:03 (GMT) |
| commit | 28518ab5eb4726fe91ee0c916b2322f8c47eb3ad (patch) | |
| tree | 2653f0ce7e9c70973f27fe6c0c38ec31e21ce5cf /ast/erfa/seps.c | |
| parent | bd7d67f66c53df36bb50e3423bfc91eae8618201 (diff) | |
| download | blt-28518ab5eb4726fe91ee0c916b2322f8c47eb3ad.zip blt-28518ab5eb4726fe91ee0c916b2322f8c47eb3ad.tar.gz blt-28518ab5eb4726fe91ee0c916b2322f8c47eb3ad.tar.bz2 | |
update ast 8.6.3
Diffstat (limited to 'ast/erfa/seps.c')
| -rw-r--r-- | ast/erfa/seps.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/ast/erfa/seps.c b/ast/erfa/seps.c new file mode 100644 index 0000000..f97fc58 --- /dev/null +++ b/ast/erfa/seps.c @@ -0,0 +1,102 @@ +#include "erfa.h" + +double eraSeps(double al, double ap, double bl, double bp) +/* +** - - - - - - - - +** e r a S e p s +** - - - - - - - - +** +** Angular separation between two sets of spherical coordinates. +** +** Given: +** al double first longitude (radians) +** ap double first latitude (radians) +** bl double second longitude (radians) +** bp double second latitude (radians) +** +** Returned (function value): +** double angular separation (radians) +** +** Called: +** eraS2c spherical coordinates to unit vector +** eraSepp angular separation between two p-vectors +** +** Copyright (C) 2013-2016, NumFOCUS Foundation. +** Derived, with permission, from the SOFA library. See notes at end of file. +*/ +{ + double ac[3], bc[3], s; + + +/* Spherical to Cartesian. */ + eraS2c(al, ap, ac); + eraS2c(bl, bp, bc); + +/* Angle between the vectors. */ + s = eraSepp(ac, bc); + + return s; + +} +/*---------------------------------------------------------------------- +** +** +** Copyright (C) 2013-2016, NumFOCUS Foundation. +** All rights reserved. +** +** This library is derived, with permission, from the International +** Astronomical Union's "Standards of Fundamental Astronomy" library, +** available from http://www.iausofa.org. +** +** The ERFA version is intended to retain identical functionality to +** the SOFA library, but made distinct through different function and +** file names, as set out in the SOFA license conditions. The SOFA +** original has a role as a reference standard for the IAU and IERS, +** and consequently redistribution is permitted only in its unaltered +** state. The ERFA version is not subject to this restriction and +** therefore can be included in distributions which do not support the +** concept of "read only" software. +** +** Although the intent is to replicate the SOFA API (other than +** replacement of prefix names) and results (with the exception of +** bugs; any that are discovered will be fixed), SOFA is not +** responsible for any errors found in this version of the library. +** +** If you wish to acknowledge the SOFA heritage, please acknowledge +** that you are using a library derived from SOFA, rather than SOFA +** itself. +** +** +** TERMS AND CONDITIONS +** +** Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions +** are met: +** +** 1 Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** +** 2 Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** +** 3 Neither the name of the Standards Of Fundamental Astronomy Board, +** the International Astronomical Union nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS +** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, +** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +** POSSIBILITY OF SUCH DAMAGE. +** +*/ |