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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Great Circle Initial Course Boston to Wellington?
From: David Pike
Date: 2017 Dec 3, 06:21 -0800
From: David Pike
Date: 2017 Dec 3, 06:21 -0800
If in doubt, use a tape measure. Distance around equator of globe 880mm. Distance Boston to Wellington 316mm. Great circle distance Boston to Wellington 316x21600/880=7756nm which is about 98% of the correct value. By inspection, the initial bearing is about 250 (although it looks more like the correct value in the photograph below). A proper floating ball could be swivelled to give some surprisingly close values as it undoubtedly was in the past. DaveP
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