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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Manual calculation of compass variation
From: Lisa Fiene
Date: 2004 Oct 16, 09:22 +1000
From: Lisa Fiene
Date: 2004 Oct 16, 09:22 +1000
Can someone explain to me how James Cook did the following: "Found the Variation of the Compass by the Even'g and Morning Amplitudes and by 2 Azths to be West 20? 59'" I've just been reading through some of his log entries, and don't really understand this one. Now we know by the compass roses on our charts what the relevant compass variation is, so have never really thought of how this is actually calculated. Thanks, Lisa
