CelestialUtil

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

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

Azimuth

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

-(double)azimuthAngleAtDate:(NSDate*)date inLocation:(CLLocationCoordinate2D)location;

e.g.

[[CMMoon new] azimuthAngleAtDate:date inLocation:location]

Declination

You can get declination angle at specific date using:

-(double)declinationAtDate:(NSDate*)date;

e.g.

[[CMSun new] declinationAtDate:date]

Elevation

You can get elevation (i.e. altitude) angle at specific date and location using:

-(double)elevationAtDate:(NSDate*)date inLocation:(CLLocationCoordinate2D)location;

e.g.

[[CMSun new] elevationAtDate:date inLocation:location]

Geocentric Distance

You can get geocentric distance at specific date using:

-(double)geocentricDistanceAtDate:(NSDate*)date;

e.g.

[[CMSun new] geocentricDistanceAtDate:date]

ARC

CelestialUtil needs ARC.

License

Licensed under the MIT license.