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Copyright (C) 2000 Liam Girdwood <liam@nova-ioe.org>
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Copyright (C) 2003 Fabien Ch�reau
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# define J2000 2451545.0
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// General Calendar Functions
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// Human readable (easy printf) date format
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int years; /*!< Years. All values are valid */
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int months; /*!< Months. Valid values : 1 (January) - 12 (December) */
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int days; /*!< Days. Valid values 1 - 28,29,30,31 Depends on month.*/
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int hours; /*!< Hours. Valid values 0 - 23. */
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int minutes; /*!< Minutes. Valid values 0 - 59. */
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double seconds; /*!< Seconds. Valid values 0 - 59.99999.... */
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/* Calculate the julian day from date.*/
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double get_julian_day(const ln_date * date);
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/* Calculate the date from the julian day. */
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void get_date(double JD, ln_date * date);
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/* Calculate day of the week. 0 = Sunday .. 6 = Saturday */
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unsigned int get_day_of_week (const ln_date *date);
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/* Calculate julian day from system time. */
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double get_julian_from_sys();
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/* Calculate gmt date from system date */
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void get_ln_date_from_sys(ln_date * date);
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// Obtains a ln_date from 2 strings s1 and s2 for date and time
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// with the form dd/mm/yyyy for s1 and hh:mm:ss.s for s2.
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// Returns NULL if s1 or s2 is not valid.
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// Uses the current date if s1 is "today" and current time if s2 is "now"
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const ln_date * str_to_date(const char * s1, const char * s2);
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// Calculate tm struct from julian day
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void get_tm_from_julian(double JD, struct tm * tm_time);
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// Calculate time_t from julian day
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time_t get_time_t_from_julian(double JD);
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// Return the number of hours to add to gmt time to get the local time
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// taking the parameters from system. This takes into account the daylight saving
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int get_gmt_shift_from_system(void);
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/* puts a large angle in the correct range 0 - 360 degrees */
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double range_degrees (double angle);
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/* puts a large angle in the correct range 0 - 2PI radians */
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double range_radians (double angle);
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/* Calculate mean sidereal time from date. */
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double get_mean_sidereal_time (double JD);
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/* Calculate apparent sidereal time from date.*/
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double get_apparent_sidereal_time (double JD);
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/* Input t is time in julian days.
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* Valid range is the years -8000 to +12000 (t = -100 to 100).
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* return mean obliquity (epsilon sub 0) in degrees.*/
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double get_mean_obliquity( double t );
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/* Calculate Earth globe centre distance. */
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void get_earth_centre_dist (float height, double latitude, double * p_sin_o, double * p_cos_o);
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/* Calculate the adjustment in altitude of a body due to atmospheric refraction. */
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double get_refraction_adj (double altitude, double atm_pres, double temp);
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#endif /* _STELLASTRO_H */
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src/stellastro/stellastro.h
