Wally,

Read OTN's method of determine the Azimuth. You can't get a accurate
instant sight due to the speed of the earths rotation, Now, that leaves
the question; how accurate do you want to be? Your choice. There are
many way to get close but it's for you to decide. I like to use a shadow
facing true north & time but OTN's way is the exact way, if your using
your Sextant

Ole Thom