autresphere / CelestialUtil

ObjC library to calculate declination/azimuth/altitude of the Sun and Moon using location and time.

CelestialUtil

Sample sources to calculate positions of the Sun and Moon using location and time.

The approximation formulas are taken from: ISBN=4805206349 日の出・日の入りの計算 : 天体の出没時刻の求め方 / 長沢工著, 東京 : 地人書館, 1999.12

Usage

You can get azimuth angle at specific date and location using:

-(double)azimuthAngleAtDate:(NSDate*)date inLocation:(CLLocationCoordinate2D)coordinte TimeZone:(NSTimeZone*)zone;

e.g.

[[[CMMoon instance] azimuthAngleAtDate:[NSDate date] inLocation:location TimeZone:[NSTimeZone defaultTimeZone]]

You can get declination as well:

-(double)declinationAtDate:(NSDate*)date inLocation:(CLLocationCoordinate2D)coordinte TimeZone:(NSTimeZone*)zone;

e.g.

[[[CMSun instance] declinationAtDate:[NSDate date] inLocation:location TimeZone:[NSTimeZone defaultTimeZone]]

Licensed under the MIT license.