From 3716996e47d32ad89c13fbd9c268da33df011c38 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Thu, 7 Jul 2016 09:47:07 +0200 Subject: Add amateur astronomical twilight MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/libred.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/src/libred.h b/src/libred.h index d04ffb6..0bccd84 100644 --- a/src/libred.h +++ b/src/libred.h @@ -45,6 +45,11 @@ */ #define LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN (-18.0) +/** + * The Sun's elevation at amateur astronomical dusk and amateur astronomical dawn, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_AMATEUR_ASTRONOMICAL_DUSK_DAWN (-15.0) + /** * Test whether it is twilight. @@ -78,6 +83,14 @@ */ #define LIBRED_IS_ASTRONOMICAL_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -32.0 / 60.0)) +/** + * Test whether it is amateur astronomical twilight. + * + * @param ELEV:double The current elevation. + * @return 1 if is astronomical twilight, 0 otherwise. + */ +#define LIBRED_IS_AMATEUR_ASTRONOMICAL_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -15.0)) + /** * Calculates the Sun's elevation as apparent -- cgit v1.2.3-70-g09d2