diff options
| -rw-r--r-- | src/libred.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/src/libred.h b/src/libred.h index 0bccd84..81066a3 100644 --- a/src/libred.h +++ b/src/libred.h @@ -87,10 +87,26 @@ * Test whether it is amateur astronomical twilight. * * @param ELEV:double The current elevation. - * @return 1 if is astronomical twilight, 0 otherwise. + * @return 1 if is amatuer astronomical twilight, 0 otherwise. */ #define LIBRED_IS_AMATEUR_ASTRONOMICAL_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -15.0)) +/** + * Test whether it is nighttime. + * + * @param ELEV:double The current elevation. + * @return 1 if is nighttime, 0 otherwise. + */ +#define LIBRED_IS_NIGHTTIME(ELEV) ((ELEV) < -18.0) + +/** + * Test whether it is daytime. + * + * @param ELEV:double The current elevation. + * @return 1 if is daytime, 0 otherwise. + */ +#define LIBRED_IS_DAYTIME(ELEV) ((ELEV) > -32.0 / 60.0) + /** * Calculates the Sun's elevation as apparent |