54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
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/*
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* sunpos.h
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* kirk johnson
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* july 1993
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*
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* code for calculating the position on the earth's surface for which
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* the sun is directly overhead (adapted from _practical astronomy
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* with your calculator, third edition_, peter duffett-smith,
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* cambridge university press, 1988.)
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*
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* RCS $Id$
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*
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* Copyright (C) 1989, 1990, 1993, 1994, 1995 Kirk Lauritz Johnson
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*
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* Parts of the source code (as marked) are:
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* Copyright (C) 1989, 1990, 1991 by Jim Frost
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* Copyright (C) 1992 by Jamie Zawinski <jwz@lucid.com>
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*
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* Permission to use, copy, modify and freely distribute xearth for
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* non-commercial and not-for-profit purposes is hereby granted
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* without fee, provided that both the above copyright notice and this
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* permission notice appear in all copies and in supporting
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* documentation.
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*
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* The author makes no representations about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*
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* THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT
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* OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef SUNPOS_H
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#define SUNPOS_H
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#include <sys/time.h>
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/* given a particular time (expressed in seconds since the unix
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* epoch), compute position on the earth (lat, lon) such that sun is
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* directly overhead. (lat, lon are reported in radians */
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void fgSunPosition(time_t ssue, double *lon, double *lat);
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#endif /* SUNPOS_H */
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