Ang_Distance¶

cosmo_utils.utils.geometry.
Ang_Distance
(ra1, ra2, dec1, dec2, unit='deg', method='haversine')[source] [edit on github]¶ Calculates angular separation between two sets of points with given right ascensions and declinations.
Taken from: https://en.wikipedia.org/wiki/Haversine_formula
Parameters: ra1, ra2 : float
Right Ascension of the 1st and 2nd points. Units in
degrees
by default.dec1, dec2 : float
Declination of the 1st and 2nd points. Units in
degrees
by default.unit : {‘dec’,’rad’} str, optional
Unit of
ra1
,ra2
,dec1
, anddec2
. This will also determine the final unit that outputs this function.method : {‘haversine’, ‘astropy’} str, optional
Method to use in order to calculate angular separation. This variable is to by default to the
haversine
method. Ifastropy
, it will use the astropy framework to determine the angular separation.Returns: ang_sep : float
Angular separation between 1st and 2nd point. In units of
degrees
.Notes
A = 90. 
dec2
B = 90. dec1
D =ra1
ra2
c = Angle between two points