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-rw-r--r--.gitignore23
-rw-r--r--COPYING674
-rw-r--r--src/10deg391
-rw-r--r--src/blackbody.c130
-rw-r--r--src/blackbody.h51
-rw-r--r--src/parse_10deg.c96
-rw-r--r--src/solar.c312
-rw-r--r--src/solar.h107
8 files changed, 1784 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
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index 0000000..892d3ac
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,23 @@
+_/
+/bin/
+/aux/
+/obj/
+\#*\#
+.*
+!.git*
+*~
+*.bak
+*.new
+*.swo
+*.swp
+*.out
+*.o
+*.su
+*.gch
+*.info
+*.pdf
+*.ps
+*.dvi
+/config.status
+/Makefile
+
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
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+ The licenses for most software and other practical works are designed
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors. You can apply it to
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/src/10deg b/src/10deg
new file mode 100644
index 0000000..d054a4c
--- /dev/null
+++ b/src/10deg
@@ -0,0 +1,391 @@
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diff --git a/src/blackbody.c b/src/blackbody.c
new file mode 100644
index 0000000..abe03a9
--- /dev/null
+++ b/src/blackbody.c
@@ -0,0 +1,130 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+#include "blackbody.h"
+#include "macros.h"
+#include <math.h>
+#include <errno.h>
+
+
+
+/**
+ * Convert from CIE xyY to [0, 1] sRGB.
+ *
+ * @param x The 'x' component.
+ * @param y The 'y' component.
+ * @param Y The 'Y' component.
+ * @param r Output parameter for the “red” value.
+ * (Seriously, sRGB red is orange, just look at it fullscreen.)
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ */
+static void
+ciexyy_to_srgb(double x, double y, double Y, double *r, double *g, double *b)
+{
+#define SRGB(C) (((C) <= 0.0031308) ? (12.92 * (C)) : ((1.0 + 0.055) * pow((C), 1.0 / 2.4) - 0.055))
+ double X, Z;
+
+ /* Convert CIE xyY to CIE XYZ. */
+ X = Y * (y == 0.0 ? 0.0 : (x / y));
+ Z = Y * (y == 0.0 ? 0.0 : ((1.0 - x - y) / y));
+
+ /* Convert CIE XYZ to [0, 1] linear RGB. (ciexyz_to_linear) */
+ *r = ( 3.240450 * X) + (-1.537140 * Y) + (-0.4985320 * Z);
+ *g = (-0.969266 * X) + ( 1.876010 * Y) + ( 0.0415561 * Z);
+ *b = (0.0556434 * X) + (-0.204026 * Y) + ( 1.0572300 * Z);
+
+ /* Convert [0, 1] linear RGB to [0, 1] sRGB. */
+ SRGB(*r), SRGB(*g), SRGB(*b);
+}
+
+
+/**
+ * Perform linear interpolation (considered very good)
+ * between the CIE xyY values for two colour temperatures
+ * and convert the result to sRGB. The two colours should
+ * be the closest below the desired colour temperature,
+ * and the closest above the desired colour temperature.
+ *
+ * @param x1 The 'x' component for the low colour.
+ * @param y1 The 'y' component for the low colour.
+ * @param x2 The 'x' component for the high colour.
+ * @param y2 The 'y' component for the high colour.
+ * @param temp The desired colour temperature.
+ * @param r Output parameter for the “red” value.
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ */
+static void
+interpolate(double x1, double y1, double x2, double y2, double temp, double *r, double *g, double *b)
+{
+ double weight = fmod(temp, (double)DELTA_TEMPERATURE) / (double)DELTA_TEMPERATURE;
+ double x = x1 * (1 - weight) + x2 * weight;
+ double y = y1 * (1 - weight) + y2 * weight;
+ ciexyy_to_srgb(x, y, 1.0, r, g, b);
+}
+
+
+/**
+ * Get the [0, 1] sRGB values of a colour temperature.
+ *
+ * @param fd File descriptor for the colour table.
+ * @param temp The desired colour temperature.
+ * @param r Output parameter for the “red” value.
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ * @return 0 on succeess, -1 on error.
+ *
+ * @throws 0 The file did not have the expected size.
+ * @throws EDOM The selected temperature is below 1000 K.
+ */
+int
+get_colour(int fd, long int temp, double *r, double *g, double *b)
+{
+ double values[10]; /* low:x,y,r,g,b + high:x,y,r,g,b */
+ off_t offset;
+ double max;
+
+ /* We do not have any values for above 40 000 K, but
+ * the differences will be unnoticeable, perhaps even
+ * unencodeable. */
+ if (temp > HIGHEST_TEMPERATURE) temp = HIGHEST_TEMPERATURE;
+ /* Things do not glow below 1000 K. Yes, fire is hot! */
+ if (temp < LOWEST_TEMPERATURE) t ((errno = EDOM));
+
+ /* Read table. */
+ offset = ((off_t)temp - LOWEST_TEMPERATURE) / DELTA_TEMPERATURE;
+ offset *= (off_t)(sizeof(values) / 2);
+ errno = 0; xpread(fd, values, sizeof(values), offset);
+
+ /* Get colour. */
+ if (temp % DELTA_TEMPERATURE)
+ interpolate(values[0], values[1], values[6], values[7], (double)temp, r, g, b);
+ else
+ *r = values[2], *g = values[3], *b = values[4];
+
+ /* Adjust colours for use. */
+ max = fmax(fmax(fabs(*r), fabs(*g)), fabs(*b));
+ if (max != 0) *r /= max, *g /= max, *b /= max;
+ *r = *r > 0.0 ? *r : 0.0;
+ *g = *g > 0.0 ? *g : 0.0;
+ *b = *b > 0.0 ? *b : 0.0;
+
+ return 0;
+fail:
+ return -1;
+}
+
diff --git a/src/blackbody.h b/src/blackbody.h
new file mode 100644
index 0000000..499e9b8
--- /dev/null
+++ b/src/blackbody.h
@@ -0,0 +1,51 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+
+
+/**
+ * The highest colour temperature in the table.
+ */
+#define LIBRED_HIGHEST_TEMPERATURE 40000
+
+/**
+ * The lowest colour temperature in the table.
+ */
+#define LIBRED_LOWEST_TEMPERATURE 1000
+
+/**
+ * The temperature difference between the colours in the table.
+ */
+#define LIBRED_DELTA_TEMPERATURE 100
+
+
+
+/**
+ * Get the [0, 1] sRGB values of a colour temperature.
+ *
+ * @param fd File descriptor for the colour table.
+ * @param temp The desired colour temperature.
+ * @param r Output parameter for the “red” value.
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ * @return 0 on succeess, -1 on error.
+ *
+ * @throws 0 The file did not have the expected size.
+ * @throws EDOM The selected temperature is below 1000 K.
+ */
+int libred_get_colour(int fd, long int temp, double *r, double *g, double *b);
+
diff --git a/src/parse_10deg.c b/src/parse_10deg.c
new file mode 100644
index 0000000..ef1c3d5
--- /dev/null
+++ b/src/parse_10deg.c
@@ -0,0 +1,96 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+#include "blackbody.h"
+#include "macros.h"
+#include <sys/stat.h>
+
+
+
+/**
+ * The number of measured temperatures.
+ */
+#define TEMPERATURES ((LIBRED_HIGHEST_TEMPERATURE - LIBRED_LOWEST_TEMPERATURE) / LIBRED_DELTA_TEMPERATURE + 1)
+
+
+
+/**
+ * Convert from CIE xyY to [0, 1] sRGB.
+ *
+ * This function is identical to that in 'blackbody.c'.
+ *
+ * @param x The 'x' component.
+ * @param y The 'y' component.
+ * @param Y The 'Y' component.
+ * @param r Output parameter for the “red” value.
+ * (Seriously, sRGB red is orange, just look at it fullscreen.)
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ */
+static void ciexyy_to_srgb(double x, double y, double Y, double *r, double *g, double *b)
+{
+#define SRGB(C) (((C) <= 0.0031308) ? (12.92 * (C)) : ((1.0 + 0.055) * pow((C), 1.0 / 2.4) - 0.055))
+ double X, Z;
+
+ /* Convert CIE xyY to CIE XYZ. */
+ X = Y * (y == 0.0 ? 0.0 : (x / y));
+ Z = Y * (y == 0.0 ? 0.0 : ((1.0 - x - y) / y));
+
+ /* Convert CIE XYZ to [0, 1] linear RGB. (ciexyz_to_linear) */
+ *r = ( 3.240450 * X) + (-1.537140 * Y) + (-0.4985320 * Z);
+ *g = (-0.969266 * X) + ( 1.876010 * Y) + ( 0.0415561 * Z);
+ *b = (0.0556434 * X) + (-0.204026 * Y) + ( 1.0572300 * Z);
+
+ /* Convert [0, 1] linear RGB to [0, 1] sRGB. */
+ SRGB(*r), SRGB(*g), SRGB(*b);
+}
+
+
+/**
+ * Create the lookup table of temperatures.
+ *
+ * Standard input should be the file '10deg',
+ * standard output should be the table file
+ * and must be a regular file.
+ *
+ * @param argc Should be 1.
+ * @param argv Should only contain the name of the process.
+ * @return 0 on success, 1 on error.
+ */
+int main(int argc, char *argv[])
+{
+#define x (xyrgb[0])
+#define y (xyrgb[1])
+#define r (xyrgb[2])
+#define g (xyrgb[3])
+#define b (xyrgb[4])
+
+ double xyrgb[5];
+ struct stat attr;
+ long int temp = LIBRED_LOWEST_TEMPERATURE;
+
+ for (; fscanf(stdin, "%lf %lf\n", &x, &y) == 2; temp += LIBRED_DELTA_TEMPERATURE)
+ {
+ (temp == 6500) ? (r = g = b = 1.0) : ciexyy_to_srgb(x, y, 1.0, &r, &g, &b);
+ xwrite(STDOUT_FILENO, xyrgb, sizeof(xyrgb));
+ }
+ xwrite(STDOUT_FILENO, xyrgb, sizeof(xyrgb)); /* sugar */
+ t (fstat(STDOUT_FILENO, &attr));
+ return ((size_t)(attr.st_size) != (TEMPERATURES + 1) * 5 * sizeof(double));
+ fail:
+ return perror(argc ? *argv : "parse_10deg"), 1;
+}
+
diff --git a/src/solar.c b/src/solar.c
new file mode 100644
index 0000000..8a57507
--- /dev/null
+++ b/src/solar.c
@@ -0,0 +1,312 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <math.h>
+#include <time.h>
+#include <errno.h>
+
+
+
+#if !defined(CLOCK_REALTIME_COARSE)
+# define CLOCK_REALTIME_COARSE CLOCK_REALTIME
+#endif
+
+
+
+/**
+ * Get current Julian Centuries time (100 Julian days since J2000.)
+ *
+ * @return The current Julian Centuries time.
+ *
+ * @throws 0 On success.
+ * @throws Any error specified for clock_gettime(3) on error.
+ */
+static double
+julian_centuries()
+{
+ struct timespec now;
+ double tm;
+ if (clock_gettime(CLOCK_REALTIME_COARSE, &now)) return 0.0;
+ tm = (double)(now.tv_nsec) / 1000000000.0 + (double)(now.tv_sec);
+ tm = (tm / 86400.0 + 2440587.5 - 2451545.0) / 36525.0;
+ return errno = 0, tm;
+}
+
+/**
+ * Convert a Julian Centuries timestamp to a Julian Day timestamp.
+ *
+ * @param tm The time in Julian Centuries
+ * @return The time in Julian Days
+ */
+static inline double
+julian_centuries_to_julian_day(double tm)
+{
+ return tm * 36525.0 + 2451545.0;
+}
+
+
+/**
+ * Convert an angle (or otherwise) from degrees to radians.
+ *
+ * @param deg The angle in degrees.
+ * @param The angle in radians.
+ */
+static inline double
+radians(double deg)
+{
+ return deg * (double)M_PI / 180.0;
+}
+
+/**
+ * Convert an angle (or otherwise) from radians to degrees.
+ *
+ * @param rad The angle in radians.
+ * @param The angle in degrees.
+ */
+static inline double
+degrees(double rad)
+{
+ return rad * 180.0 / (double)M_PI;
+}
+
+
+/**
+ * Calculates the Sun's elevation from the solar hour angle
+ *
+ * @param longitude The longitude in degrees eastwards.
+ * from Greenwich, negative for westwards.
+ * @param declination The declination, in radians.
+ * @param hour_angle The solar hour angle, in radians.
+ * @return The Sun's elevation, in radians.
+ */
+static inline double
+elevation_from_hour_angle(double latitude, double declination, double hour_angle)
+{
+ double rc = cos(radians(latitude));
+ rc *= cos(hour_angle) * cos(declination);
+ rc += sin(radians(latitude)) * sin(declination);
+ return asin(rc);
+}
+
+/**
+ * Calculates the Sun's geometric mean longitude.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Sun's geometric mean longitude in radians.
+ */
+static inline double
+sun_geometric_mean_longitude(double tm)
+{
+ double rc = fmod(pow(0.0003032 * tm, 2.0) + 36000.76983 * tm + 280.46646, 360.0);
+#if defined(TIMETRAVELLER)
+ rc = rc < 0.0 ? (rc + 360.0) : rc;
+#endif
+ return radians(rc);
+}
+
+/**
+ * Calculates the Sun's geometric mean anomaly.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Sun's geometric mean anomaly in radians.
+ */
+static inline double
+sun_geometric_mean_anomaly(double tm)
+{
+ return radians(pow(-0.0001537 * tm, 2.0) + 35999.05029 * tm + 357.52911);
+}
+
+/**
+ * Calculates the Earth's orbit eccentricity.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Earth's orbit eccentricity.
+ */
+static inline double
+earth_orbit_eccentricity(double tm)
+{
+ return pow(-0.0000001267 * tm, 2.0) - 0.000042037 * tm + 0.016708634;
+}
+
+/**
+ * Calculates the Sun's equation of the centre, the difference
+ * between the true anomaly and the mean anomaly.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Sun's equation of the centre, in radians.
+ */
+static inline double
+sun_equation_of_centre(double tm)
+{
+ double a = sun_geometric_mean_anomaly(tm), rc;
+ rc = sin(1.0 * a) * (pow(-0.000014 * tm, 2.0) - 0.004817 * tm + 1.914602);
+ rc += sin(2.0 * a) * (-0.000101 * tm + 0.019993);
+ rc += sin(3.0 * a) * 0.000289;
+ return radians(rc);
+}
+
+/**
+ * Calculates the Sun's real longitudinal position.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The longitude, in radians.
+ */
+static inline double
+sun_real_longitude(double tm)
+{
+ return sun_geometric_mean_longitude(tm) + sun_equation_of_centre(tm);
+}
+
+/**
+ * Calculates the Sun's apparent longitudinal position.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The longitude, in radians.
+ */
+static inline double
+sun_apparent_longitude(double tm)
+{
+ double rc = degrees(sun_real_longitude(tm)) - 0.00569;
+ return radians(rc - 0.00478 * sin(radians(-1934.136 * tm + 125.04)));
+}
+
+/**
+ * Calculates the mean ecliptic obliquity of the Sun's
+ * apparent motion without variation correction.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The uncorrected mean obliquity, in radians.
+ */
+static double
+mean_ecliptic_obliquity(double tm)
+{
+ double rc = pow(0.001813 * tm, 3.0) - pow(0.00059 * tm, 2.0) - 46.815 * tm + 21.448;
+ return radians(23.0 + (26.0 + rc / 60.0) / 60.0);
+}
+
+/**
+ * Calculates the mean ecliptic obliquity of the Sun's
+ * parent motion with variation correction.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The mean obliquity, in radians.
+ */
+static double
+corrected_mean_ecliptic_obliquity(double tm)
+{
+ double rc = 0.00256 * cos(radians(-1934.136 * tm + 125.04));
+ return radians(rc + degrees(mean_ecliptic_obliquity(tm)));
+}
+
+/**
+ * Calculates the Sun's declination.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Sun's declination, in radian.
+ */
+static inline double
+solar_declination(double tm)
+{
+ double rc = sin(corrected_mean_ecliptic_obliquity(tm));
+ return asin(rc * sin(sun_apparent_longitude(tm)));
+}
+
+/**
+ * Calculates the equation of time, the discrepancy
+ * between apparent and mean solar time.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The equation of time, in degrees.
+ */
+static inline double
+equation_of_time(double tm)
+{
+ double l = sun_geometric_mean_longitude(tm);
+ double e = earth_orbit_eccentricity(tm);
+ double m = sun_geometric_mean_anomaly(tm);
+ double y = pow(tan(corrected_mean_ecliptic_obliquity(tm) / 2.0), 2.0);
+ double rc = y * sin(2.0 * l);
+ rc += (4.0 * y * cos(2.0 * l) - 2.0) * e * sin(m);
+ rc -= pow(0.5 * y, 2.0) * sin(4.0 * l);
+ rc -= pow(1.25 * e, 2.0) * sin(2.0 * m);
+ return 4.0 * degrees(rc);
+}
+
+/**
+ * Calculates the Sun's elevation as apparent.
+ * from a geographical position.
+ *
+ * @param tm The time in Julian Centuries.
+ * @param latitude The latitude in degrees northwards from
+ * the equator, negative for southwards.
+ * @param longitude The longitude in degrees eastwards from
+ * Greenwich, negative for westwards.
+ * @return The Sun's apparent elevation at the specified time as seen
+ * from the specified position, measured in radians.
+ */
+static inline double
+solar_elevation_from_time(double tm, double latitude, double longitude)
+{
+ double rc = julian_centuries_to_julian_day(tm);
+ rc = (rc - round(rc) - 0.5) * 1440;
+ rc = 720.0 - rc - equation_of_time(tm);
+ rc = radians(rc / 4.0 - longitude);
+ return elevation_from_hour_angle(latitude, solar_declination(tm), rc);
+}
+
+
+/**
+ * Calculates the Sun's elevation as apparent.
+ * from a geographical position.
+ *
+ * @param latitude The latitude in degrees northwards from
+ * the equator, negative for southwards.
+ * @param longitude The longitude in degrees eastwards from
+ * Greenwich, negative for westwards.
+ * @return The Sun's apparent elevation as seen, right now,
+ * from the specified position, measured in degrees.
+ *
+ * @throws 0 On success.
+ * @throws Any error specified for clock_gettime(3) on error.
+ */
+double
+solar_elevation(double latitude, double longitude)
+{
+ double tm = julian_centuries();
+ return errno ? -1 : degrees(solar_elevation_from_time(tm, latitude, longitude));
+}
+
+
+/**
+ * Exit if time the is before year 0 in J2000.
+ *
+ * @return 0 on success, -1 on error.
+ */
+#if defined(TIMETRAVELLER)
+int
+check_timetravel(void)
+{
+ struct timespec now;
+ if (clock_gettime(CLOCK_REALTIME, &now)) return -1;
+ if (now.tv_nsec < (time_t)946728000L)
+ fprintf(stderr, "We have detected that you are a time-traveller"
+ "(or your clock is not configured correctly.)"
+ "Please recompile with -DTIMETRAVELLER"
+ "(or correct your clock.)"), exit(1);
+ return 0;
+}
+#endif
+
diff --git a/src/solar.h b/src/solar.h
new file mode 100644
index 0000000..8e94cf9
--- /dev/null
+++ b/src/solar.h
@@ -0,0 +1,107 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+
+/**
+ * Approximate apparent size of the Sun in degrees.
+ */
+#define LIBRED_SOLAR_APPARENT_RADIUS (32.0 / 60.0)
+
+
+/**
+ * The Sun's elevation at sunset and sunrise, measured in degrees.
+ */
+#define LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE (0.0)
+
+/**
+ * The Sun's elevation at civil dusk and civil dawn, measured in degrees.
+ */
+#define LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN (-6.0)
+
+/**
+ * The Sun's elevation at nautical dusk and nautical dawn, measured in degrees.
+ */
+#define LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN (-12.0)
+
+/**
+ * The Sun's elevation at astronomical dusk and astronomical dawn, measured in degrees.
+ */
+#define LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN (-18.0)
+
+
+/**
+ * Test whether it is twilight.
+ *
+ * @param ELEV:double The current elevation.
+ * @return 1 if is twilight, 0 otherwise.
+ */
+#define LIBRED_IS_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= 0.0))
+
+/**
+ * Test whether it is civil twilight.
+ *
+ * @param ELEV:double The current elevation.
+ * @return 1 if is civil twilight, 0 otherwise.
+ */
+#define LIBRED_IS_CIVIL_TWILIGHT(ELEV) ((-6.0 <= (ELEV)) && ((ELEV) <= 0.0))
+
+/**
+ * Test whether it is nautical twilight.
+ *
+ * @param ELEV:double The current elevation.
+ * @return 1 if is nautical twilight, 0 otherwise.
+ */
+#define LIBRED_IS_NAUTICAL_TWILIGHT(ELEV) ((-12.0 <= (ELEV)) && ((ELEV) <= -6.0))
+
+/**
+ * Test whether it is astronomical twilight.
+ *
+ * @param ELEV:double The current elevation.
+ * @return 1 if is astronomical twilight, 0 otherwise.
+ */
+#define LIBRED_IS_ASTRONOMICAL_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -12.0))
+
+
+
+/**
+ * Calculates the Sun's elevation as apparent.
+ * from a geographical position.
+ *
+ * @param latitude The latitude in degrees northwards from
+ * the equator, negative for southwards.
+ * @param longitude The longitude in degrees eastwards from
+ * Greenwich, negative for westwards.
+ * @return The Sun's apparent elevation as seen, right now,
+ * from the specified position, measured in degrees.
+ *
+ * @throws 0 On success.
+ * @throws Any error specified for clock_gettime(3) on error.
+ */
+double libred_solar_elevation(double latitude, double longitude);
+
+
+/**
+ * Exit if time the is before year 0 in J2000.
+ *
+ * @return 0 on success, -1 on error.
+ */
+#if defined(TIMETRAVELLER)
+int libred_check_timetravel(void);
+#else
+# define libred_check_timetravel() 0
+#endif
+
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