I'll resurrect this thread for a comment.
Checking your notes, for exposure times, checking your equipment, hoping clouds don't roll in, or a plane passing through the shot. Get your guide star in the cross hairs. Shield your lens, or scope. Flop up the mirror. Open the shutter. Count to 10. Hold your breath. Remove your shield. Then patiently keep your guide star in the cross hairs for the next 45 minutes. Then, cover the lens, close the shutter and breathe.
The the anticipation of the shot is killing you. Do you take another? You're freezing, your neck is killing you. You got to get this little hunk of plastic to the dark room, or to the film lab.
At this point " Wanting is better than Having ".
Oh well, better luck next time. Or better yet " Bulls eye !!! "
Kinda' like when we used to have to kick-start a motorcycle, " This next kick for sure"