Homework Help: Angular Separation Between Two Stars

1. Sep 23, 2005

ps2983

I aim trying to do a problem where I have 2 Equatorial Coordinates, and I need to find the angular distance in between this two points. Thanks in advance.

2. Sep 23, 2005

lightgrav

Do you mean RA and dec?

If the stars are close to one another you can use Pythagoras.
declination is already in actual degrees;
Right Ascension must be converted from hours to degrees,
(15 deg/hr) cos(dec) , to compensate for meeting at the pole.

If the stars are far apart, you'll have to make a great circle
that passes through them both.