I would be interested in any spherical trigonometry if anyone knows more about it. I would assume polar alignment was already completed but not accurate and looking at this to possible calculate differences. Possible alternative to drift alignment. Collecting the data or manipulating the mount isn't a problem.
The real alternative to drift is either a PoleMaster or Sharcap Pro. They use platesolving (behind the scenes) to polar align very fast, easy and accurately. Just one of the many things a computer can do better than you can. <smile>
I've never been able to do a drift alignment any better than the PoleMaster. In any event, it's "good enough" to avoid any issues imaging.
After you use any method, you can easily check the accuracy by running guiding assistant in PhD2.
Edited by bobzeq25, 14 September 2019 - 12:54 AM.