78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
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/*
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* sunsolver.hxx - given a location on earth and a time of day/date,
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* find the number of seconds to various sun positions.
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*
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* Written by Curtis Olson, started September 2003.
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*
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* Copyright (C) 2003 Curtis L. Olson - curt@flightgear.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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#ifndef _SUNSOLVER_HXX
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#define _SUNSOLVER_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <simgear/compiler.h>
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#ifdef SG_HAVE_STD_INCLUDES
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# include <ctime>
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#else
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# include <time.h>
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#endif
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/**
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* Given the current unix time in seconds, calculate seconds to
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* highest sun angle.
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*/
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time_t fgTimeSecondsUntilNoon( time_t cur_time,
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double lon_rad,
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double lat_rad );
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/**
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* Given the current unix time in seconds, calculate seconds to lowest
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* sun angle.
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*/
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time_t fgTimeSecondsUntilMidnight( time_t cur_time,
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double lon_rad,
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double lat_rad );
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/**
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* Given the current unix time in seconds, calculate seconds to dusk
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*/
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time_t fgTimeSecondsUntilDusk( time_t cur_time,
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double lon_rad,
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double lat_rad );
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/**
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* Given the current unix time in seconds, calculate seconds to dawn
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*/
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time_t fgTimeSecondsUntilDawn( time_t cur_time,
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double lon_rad,
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double lat_rad );
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#endif /* _SUNSOLVER_HXX */
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