diff options
Diffstat (limited to 'src/libred.h')
| -rw-r--r-- | src/libred.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/libred.h b/src/libred.h index 81066a3..3cc2c86 100644 --- a/src/libred.h +++ b/src/libred.h @@ -50,6 +50,26 @@ */ #define LIBRED_SOLAR_ELEVATION_AMATEUR_ASTRONOMICAL_DUSK_DAWN (-15.0) +/** + * The Sun's lowest elevation during the golden hour, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_GOLDEN_HOUR_LOW (-4.0) + +/** + * The Sun's highest elevation during the golden hour, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_GOLDEN_HOUR_HIGH (6.0) + +/** + * The Sun's lowest elevation during the blue hour, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_BLUE_HOUR_LOW (-6.0) + +/** + * The Sun's highest elevation during the blue hour, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_BLUE_HOUR_HIGH (-4.0) + /** * Test whether it is twilight. @@ -107,6 +127,22 @@ */ #define LIBRED_IS_DAYTIME(ELEV) ((ELEV) > -32.0 / 60.0) +/** + * Test whether it is the golden hour. + * + * @param ELEV:double The current elevation. + * @return 1 if is golden hour, 0 otherwise. + */ +#define LIBRED_IS_GOLDEN_HOUR(ELEV) ((-4.0 <= (ELEV)) && ((ELEV) <= 6.0)) + +/** + * Test whether it is the blue hour. + * + * @param ELEV:double The current elevation. + * @return 1 if is blue hour, 0 otherwise. + */ +#define LIBRED_IS_BLUE_HOUR(ELEV) ((-6.0 <= (ELEV)) && ((ELEV) <= -4.0)) + /** * Calculates the Sun's elevation as apparent |