A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2021 Jul 22, 08:07 -0700
Even if you wished to navigate near the North Pole using Polaris, you would still need to know how to plot your position line from your assumed position at the North Pole. Now correct me if I’m wrong, but to find your ‘pseudo azimuth’ (for want of a better term) you would start from the Greenwich Meridian on your polar azimuthal chart and go clockwise by GHA Aries to find the direction of Aries. Then you would carry on clockwise by SHA Polaris to find Polaris, so mark your ‘pseudo azimuth along this meridian.
Now if we were exactly at the Pole Hc Polaris, if we can see it (unlikely unless we’re in a nuclear submarine, because who wants to be outside at the North Pole in the middle of winter) would be dec Polaris = 89 15.8’ (last figures available to me). Now we have a problem, because if Ho was greater than this we might be in a bracket 44nm either side of Polaris’ sub stellar point. If Ho was less than this, we would be outside this bracket, but which side.
If there was sufficient darkness, we might be able to resolve this problem over a period of time, but we can leave that to another question. Otherwise, if we could see a more distant body, Mirfak for example, we could confirm which side of Polaris from that. DaveP