Move source and headers to src dir.

1 files changed, 0 insertions, 318 deletions

diff --git a/solar.c b/solar.c
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index 2d66fff..0000000
--- a/solar.c
+++ /dev/null
@@ -1,318 +0,0 @@
-/* solar.c -- Solar position source
-   This file is part of Redshift.
-
-   Redshift 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 3 of the License, or
-   (at your option) any later version.
-
-   Redshift 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 Redshift.  If not, see <http://www.gnu.org/licenses/>.
-
-   Copyright (c) 2009  Jon Lund Steffensen <jonlst@gmail.com>
-*/
-
-/* Ported from javascript code by U.S. Department of Commerce,
-   National Oceanic & Atmospheric Administration:
-   http://www.srrb.noaa.gov/highlights/sunrise/calcdetails.html
-   It is based on equations from "Astronomical Algorithms" by
-   Jean Meeus. */
-
-#include <math.h>
-#include <time.h>
-
-#include "solar.h"
-
-#define RAD(x)  ((x)*(M_PI/180))
-#define DEG(x)  ((x)*(180/M_PI))
-
-
-/* Angels of various times of day. */
-static const double time_angle[] = {
-	[SOLAR_TIME_ASTRO_DAWN] = RAD(-90.0 + SOLAR_ASTRO_TWILIGHT_ELEV),
-	[SOLAR_TIME_NAUT_DAWN] = RAD(-90.0 + SOLAR_NAUT_TWILIGHT_ELEV),
-	[SOLAR_TIME_CIVIL_DAWN] = RAD(-90.0 + SOLAR_CIVIL_TWILIGHT_ELEV),
-	[SOLAR_TIME_SUNRISE] = RAD(-90.0 + SOLAR_DAYTIME_ELEV),
-	[SOLAR_TIME_NOON] = RAD(0.0),
-	[SOLAR_TIME_SUNSET] = RAD(90.0 - SOLAR_DAYTIME_ELEV),
-	[SOLAR_TIME_CIVIL_DUSK] = RAD(90.0 - SOLAR_CIVIL_TWILIGHT_ELEV),
-	[SOLAR_TIME_NAUT_DUSK] = RAD(90.0 - SOLAR_NAUT_TWILIGHT_ELEV),
-	[SOLAR_TIME_ASTRO_DUSK] = RAD(90.0 - SOLAR_ASTRO_TWILIGHT_ELEV)
-};
-
-
-/* Unix time from Julian day */
-static time_t
-unix_time_from_jd(double jd)
-{
-	return 86400.0*(jd - 2440587.5);
-}
-
-/* Julian day from unix time */
-static double
-jd_from_unix_time(time_t t)
-{
-	return (t / 86400.0) + 2440587.5;
-}
-
-/* Julian centuries since J2000.0 from Julian day */
-static double
-jcent_from_jd(double jd)
-{
-	return (jd - 2451545.0) / 36525.0;
-}
-
-/* Julian day from Julian centuries since J2000.0 */
-static double
-jd_from_jcent(double t)
-{
-	return 36525.0*t + 2451545.0;
-}
-
-/* Geometric mean longitude of the sun.
-   t: Julian centuries since J2000.0
-   Return: Geometric mean logitude in radians. */
-static double
-sun_geom_mean_lon(double t)
-{
-	/* FIXME returned value should always be positive */
-	return RAD(fmod(280.46646 + t*(36000.76983 + t*0.0003032), 360));
-}
-
-/* Geometric mean anomaly of the sun.
-   t: Julian centuries since J2000.0
-   Return: Geometric mean anomaly in radians. */
-static double
-sun_geom_mean_anomaly(double t)
-{
-	return RAD(357.52911 + t*(35999.05029 - t*0.0001537));
-}
-
-/* Eccentricity of earth orbit.
-   t: Julian centuries since J2000.0
-   Return: Eccentricity (unitless). */
-static double
-earth_orbit_eccentricity(double t)
-{
-	return 0.016708634 - t*(0.000042037 + t*0.0000001267);
-}
-
-/* Equation of center of the sun.
-   t: Julian centuries since J2000.0
-   Return: Center(?) in radians */
-static double
-sun_equation_of_center(double t)
-{
-	/* Use the first three terms of the equation. */
-	double m = sun_geom_mean_anomaly(t);
-	double c = sin(m)*(1.914602 - t*(0.004817 + 0.000014*t)) +
-		sin(2*m)*(0.019993 - 0.000101*t) +
-		sin(3*m)*0.000289;
-	return RAD(c);
-}
-
-/* True longitude of the sun.
-   t: Julian centuries since J2000.0
-   Return: True longitude in radians */
-static double
-sun_true_lon(double t)
-{
-	double l_0 = sun_geom_mean_lon(t);
-	double c = sun_equation_of_center(t);
-	return l_0 + c;
-}
-
-/* Apparent longitude of the sun. (Right ascension).
-   t: Julian centuries since J2000.0
-   Return: Apparent longitude in radians */
-static double
-sun_apparent_lon(double t)
-{
-	double o = sun_true_lon(t);
-	return RAD(DEG(o) - 0.00569 - 0.00478*sin(RAD(125.04 - 1934.136*t)));
-}
-
-/* Mean obliquity of the ecliptic
-   t: Julian centuries since J2000.0
-   Return: Mean obliquity in radians */
-static double
-mean_ecliptic_obliquity(double t)
-{
-	double sec = 21.448 - t*(46.815 + t*(0.00059 - t*0.001813));
-	return RAD(23.0 + (26.0 + (sec/60.0))/60.0);
-}
-
-/* Corrected obliquity of the ecliptic.
-   t: Julian centuries since J2000.0
-   Return: Currected obliquity in radians */
-static double
-obliquity_corr(double t)
-{
-	double e_0 = mean_ecliptic_obliquity(t);
-	double omega = 125.04 - t*1934.136;
-	return RAD(DEG(e_0) + 0.00256*cos(RAD(omega)));
-}
-
-/* Declination of the sun.
-   t: Julian centuries since J2000.0
-   Return: Declination in radians */
-static double
-solar_declination(double t)
-{
-	double e = obliquity_corr(t);
-	double lambda = sun_apparent_lon(t);
-	return asin(sin(e)*sin(lambda));
-}
-
-/* Difference between true solar time and mean solar time.
-   t: Julian centuries since J2000.0
-   Return: Difference in minutes */
-static double
-equation_of_time(double t)
-{
-	double epsilon = obliquity_corr(t);
-	double l_0 = sun_geom_mean_lon(t);
-	double e = earth_orbit_eccentricity(t);
-	double m = sun_geom_mean_anomaly(t);
-	double y = pow(tan(epsilon/2.0), 2.0);
-
-	double eq_time = y*sin(2*l_0) - 2*e*sin(m) +
-		4*e*y*sin(m)*cos(2*l_0) -
-		0.5*y*y*sin(4*l_0) -
-		1.25*e*e*sin(2*m);
-	return 4*DEG(eq_time);
-}
-
-/* Hour angle at the location for the given angular elevation.
-   lat: Latitude of location in degrees
-   decl: Declination in radians
-   elev: Angular elevation angle in radians
-   Return: Hour angle in radians */
-static double
-hour_angle_from_elevation(double lat, double decl, double elev)
-{
-	double omega = acos((cos(fabs(elev)) - sin(RAD(lat))*sin(decl))/
-			    (cos(RAD(lat))*cos(decl)));
-	return copysign(omega, -elev);
-}
-
-/* Angular elevation at the location for the given hour angle.
-   lat: Latitude of location in degrees
-   decl: Declination in radians
-   ha: Hour angle in radians
-   Return: Angular elevation in radians */
-static double
-elevation_from_hour_angle(double lat, double decl, double ha)
-{
-	return asin(cos(ha)*cos(RAD(lat))*cos(decl) +
-		    sin(RAD(lat))*sin(decl));
-}
-
-/* Time of apparent solar noon of location on earth.
-   t: Julian centuries since J2000.0
-   lon: Longitude of location in degrees
-   Return: Time difference from mean solar midnigth in minutes */
-static double
-time_of_solar_noon(double t, double lon)
-{
-	/* First pass uses approximate solar noon to
-	   calculate equation of time. */
-	double t_noon = jcent_from_jd(jd_from_jcent(t) - lon/360.0);
-	double eq_time = equation_of_time(t_noon);
-	double sol_noon = 720 - 4*lon - eq_time;
-
-	/* Recalculate using new solar noon. */
-	t_noon = jcent_from_jd(jd_from_jcent(t) - 0.5 + sol_noon/1440.0);
-	eq_time = equation_of_time(t_noon);
-	sol_noon = 720 - 4*lon - eq_time;
-
-	/* No need to do more iterations */
-	return sol_noon;
-}
-
-/* Time of given apparent solar angular elevation of location on earth.
-   t: Julian centuries since J2000.0
-   t_noon: Apparent solar noon in Julian centuries since J2000.0
-   lat: Latitude of location in degrees
-   lon: Longtitude of location in degrees
-   elev: Solar angular elevation in radians
-   Return: Time difference from mean solar midnight in minutes */
-static double
-time_of_solar_elevation(double t, double t_noon,
-			double lat, double lon, double elev)
-{
-	/* First pass uses approximate sunrise to
-	   calculate equation of time. */
-	double eq_time = equation_of_time(t_noon);
-	double sol_decl = solar_declination(t_noon);
-	double ha = hour_angle_from_elevation(lat, sol_decl, elev);
-	double sol_offset = 720 - 4*(lon + DEG(ha)) - eq_time;
-
-	/* Recalculate using new sunrise. */
-	double t_rise = jcent_from_jd(jd_from_jcent(t) + sol_offset/1440.0);
-	eq_time = equation_of_time(t_rise);
-	sol_decl = solar_declination(t_rise);
-	ha = hour_angle_from_elevation(lat, sol_decl, elev);
-	sol_offset = 720 - 4*(lon + DEG(ha)) - eq_time;
-
-	/* No need to do more iterations */
-	return sol_offset;
-}
-
-/* Solar angular elevation at the given location and time.
-   t: Julian centuries since J2000.0
-   lat: Latitude of location
-   lon: Longitude of location
-   Return: Solar angular elevation in radians */
-static double
-solar_elevation_from_time(double t, double lat, double lon)
-{
-	/* Minutes from midnight */
-	double jd = jd_from_jcent(t);
-	double offset = (jd - round(jd) - 0.5)*1440.0;
-
-	double eq_time = equation_of_time(t);
-	double ha = RAD((720 - offset - eq_time)/4 - lon);
-	double decl = solar_declination(t);
-	return elevation_from_hour_angle(lat, decl, ha);
-}
-
-double
-solar_elevation(time_t date, double lat, double lon)
-{
-	double jd = jd_from_unix_time(date);
-	return DEG(solar_elevation_from_time(jcent_from_jd(jd), lat, lon));
-}
-
-void
-solar_table_fill(time_t date, double lat, double lon, time_t *table)
-{
-	/* Calculate Julian day */
-	double jd = jd_from_unix_time(date);
-
-	/* Calculate Julian day number */
-	double jdn = round(jd);
-	double t = jcent_from_jd(jdn);
-
-	/* Calculate apparent solar noon */
-	double sol_noon = time_of_solar_noon(t, lon);
-	double j_noon = jdn - 0.5 + sol_noon/1440.0;
-	double t_noon = jcent_from_jd(j_noon);
-	table[SOLAR_TIME_NOON] = unix_time_from_jd(j_noon);
-
-	/* Calculate solar midnight */
-	table[SOLAR_TIME_MIDNIGHT] = unix_time_from_jd(j_noon + 0.5);
-
-	/* Calulate absoute time of other phenomena */
-	for (int i = 2; i < SOLAR_TIME_MAX; i++) {
-		double angle = time_angle[i];
-		double offset =
-			time_of_solar_elevation(t, t_noon, lat, lon, angle);
-		table[i] = unix_time_from_jd(jdn - 0.5 + offset/1440.0);
-	}
-}