I've done Polaris at 42?ø latitude, but it's a neck bender to get the chin out of the way.?ÿ I'd hate to try it any further north without a right-angle eyepiece.
@bill93 That is why using a DKM3 (or Wild T4) is so nice, you are always looking directly into the eyepiece on the side of the instrument rather than at a steep vertical angle. Unfortunately I have neither.?ÿ
I believe polaris was used almost exclusively in the past (at least in northern latitudes) due to the fact that time was not as important especially at elongation, and it was easily found. As Larry Scott said, with accurate time and accurate ephemerides you can pretty much use any star, although you would want to avoid stars low on the horizon. BUT, I believe using a technique similar to Blacks Azimuth would be better than using a single star.?ÿ
Black's Azimuth Empire Survey Review October 1951
Dave Lehman had developed an online program to process these types of observations, but he passed away suddenly in February of 2017 and his work is no longer online.?ÿ
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