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