angSep {astroFns} | R Documentation |
Angular separation of two sky positions
Description
angSep
calculates the angular separation of two sky positions
using spherical trigonometry.
Usage
angSep(ra1, dec1, ra2, dec2)
Arguments
ra1 |
Right ascention (string) of the first position. |
dec1 |
Declination of (string) the first position. |
ra2 |
Right ascention (string) the second position. |
dec2 |
Declination of (string) the second position. |
Details
Enter positions as text strings with fields separated by characters d, h, m, s, a colon, or a comma, e.g. '17, 42, 28', '-28h43m03s', or '- 28 :43 : 3'. Spaces are removed in input conversion. This is a spherical trigonometry calculation, valid for small and large distances.
Value
Returns angluar separation in decimal degrees.
Author(s)
Andrew Harris
See Also
See dms2rad
, hms2rad
for input conversions.
Examples
angSep('1, 59, 03', '-3, 40, 44', '2, 30', '5, 40, 03')
angSep('1h59m03s', '-3d40m44s', '2h30', '5h40m03')
angSep('1', '0', '2', '0')
angSep(' 1, 40, 4', ' - 5, 6', '3', '1')
[Package astroFns version 4.2-1 Index]