Usage of angularSeparationRadians

Return to directory of Todd's CASA extensions

Computes the great circle angle between two celestial coordinates. using the Vincenty formula which is correct for all angles.

See also angularSeparationOfStrings, angularSeparationOfFields, angularSeparationOfPlanets, angularSeparation, and angularSeparationRadiansTuples.


au.angularSeparationRadians(ra0, dec0, ra1, dec1, returnComponents=False)

ra,dec must be given in radians as is the output. It also works for the az,el coordinate system. If returnComponents is True, it also returns the separation along the two coordinate system components via the following array: [separation, separationRA, separationDec, separationRA*cosine(Dec)]


CASA <4>: au.angularSeparationRadians(0,1,2,3)
  Out[4]: 1.222450611061632
CASA <3>: au.angularSeparationRadians(0,1,2,3,True)
  Out[3]: array([ 1.22245061, -2.        , -2.        ,  0.83229367])
-- ToddHunter - 2013-01-25

This topic: ALMA > TWikiUsers > ToddHunter > CasaExtensions > AngularSeparationRadians
Topic revision: 2013-02-28, ToddHunter
This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding NRAO Public Wiki? Send feedback