Tools Astrocalculator Angular Distance module The Angular Distance calculator module Angular Distance The Angular Distance tool is used to measure the angle between any two points on the sky. You simply specify the Equatorial coordinates of the desired pair of points, and then obtain the angle between the two points. There is also a Batch mode for this module. In batch mode, you specify an input filename which contains a number of parameters (up to four) on each line: the initial right ascension (RA), initial declination (Dec), final right ascension and final declination. By default, each line should contain four numbers signifying the RA and Dec values for pairs of points. Alternatively, you can specify a single value for any of these four coordinates in the calculator panel (the corresponding values in the input file should be skipped if they are specified in the calculator). Once you have specified the input filename and an output filename, simply press the Run button to generate the output file.