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