/* * bodysolver.hxx - given a location on earth and a time of day/date, * find the number of seconds to various solar system body * positions. * * Written by Curtis Olson, started September 2003. * * Copyright (C) 2003 Curtis L. Olson - http://www.flightgear.org/~curt * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * $Id$ */ #ifndef _BODYSOLVER_HXX #define _BODYSOLVER_HXX #ifndef __cplusplus # error This library requires C++ #endif #include <simgear/compiler.h> #include <ctime> class SGGeod; /** * Given the current unix time in seconds, calculate seconds to the * specified solar system body angle (relative to straight up.) Also * specify if we want the angle while the body is ascending or descending. * For instance noon is when the sun angle is 0 (or the closest it can * get.) Dusk is when the sun angle is 90 and descending. Dawn is * when the sun angle is 90 and ascending. */ time_t fgTimeSecondsUntilBodyAngle( time_t cur_time, const SGGeod& loc, double target_angle_deg, bool ascending, const char *body ); /** * given a particular time expressed in side real time at prime * meridian (GST), compute position on the earth (lat, lon) such that * solar system body is directly overhead. (lat, lon are reported in * radians) */ void fgBodyPositionGST(double gst, double *lon, double *lat, const char *body); #endif /* _BODYSOLVER_HXX */