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Convert Azimuth and Elevation to Right Ascension and Declination

29 Jun 2009 (Updated 28 Jan 2010)

Code covered by the BSD License

Algorithm will convert Az/El angles to RA /DEC using a topocentric coordinate frame

File Information
Description	Function Description: AzEl2RaDec will take the Azimuth and Elevation in the local horizon reference frame, site latitude and longitude as well as a time in GMT and output the Right Ascension and Declination in the topocentric coordinate frame. List of Inputs: Local Azimuth Angle (degrees) Local Elevation Angle (degrees) Lat (Site Latitude in degrees -90:90 -> S(-) N(+)) Lon (Site Longitude in degrees -180:180 W(-) E(+)) UTC (Coordinated Universal Time YYYY/MM/DD hh:mm:ss) List of Outputs: Topocentric Right Ascension (Degrees) Topocentric Declination Angle (Degrees) Sample Function Call: [RA DEC] = AzEl2RaDec(210.8250667,23.8595052,39.007,-104.883,'1994/05/14 13:11:20.59856')
MATLAB release	MATLAB 7.7 (R2008b)
Zip File Content
Other Files	AzEl2RaDec.m, license.txt

Tags for This File
Everyone's Tags	az, azimuth, dec, declination, el, elevation, julian day, ra, raan, right ascension, right ascension of the ascending node, sidereal
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Comments and Ratings (1)
13 Jul 2009	Olli	Hi, I would like to know what are the local coordinate frame zero points and turning directions. I'm not even sure what are the official ones...

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Updates
23 Jan 2010	- Updated quadrant check with atan2 - Vectorized for speed
28 Jan 2010	Corrected terminology

Tag Activity for this File
Tag	Applied By	Date/Time
raan	Darin Koblick	29 Jun 2009 12:14:28
ra	Darin Koblick	29 Jun 2009 12:14:28
dec	Darin Koblick	29 Jun 2009 12:14:28
az	Darin Koblick	29 Jun 2009 12:14:28
el	Darin Koblick	29 Jun 2009 12:14:28
azimuth	Darin Koblick	29 Jun 2009 12:14:28
elevation	Darin Koblick	29 Jun 2009 12:14:28
sidereal	Darin Koblick	29 Jun 2009 12:14:28
julian day	Darin Koblick	29 Jun 2009 12:14:28
right ascension	Darin Koblick	29 Jun 2009 12:14:28
right ascension of the ascending node	Darin Koblick	29 Jun 2009 12:14:28
declination	Darin Koblick	29 Jun 2009 12:14:28

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