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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Practical Haversine Use
From: David Pike
Date: 2021 Nov 12, 13:06 -0800
From: David Pike
Date: 2021 Nov 12, 13:06 -0800
Here’s another little haversine problem ‘Little Ship Astro-Navigation' has got me thinking about. The After adding up log cos lat + log cos dec + Log hav LHA the author says “The sum is a log haversine and will contain two figures before the decimal point and five after it. Discard the first of the two figures (mathematicians will know why; others need not worry why!).”
I’m not a mathematician, but I would like to know why. I can only assume he’s making a poor job of explaining the ‘bar’s and ‘9s’ alternatives in the log haversine/haversine combined tables. DaveP
