NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: longitude by lunar distance
From: Doug Rynda
Date: 2012 May 11, 14:36 -0700
From: Doug Rynda
Date: 2012 May 11, 14:36 -0700
Paul
It is confusing because, prior to the Twentieth century, navigators usually thought of Longitude in terms of time rather than angle. That’s why Slocum says that to find your Longitude you compare your local time with GMT. Nowadays we would say to add or subtract the Local Hour Angle of a body from the body’s Greenwich Hour Angle. It amounts to exactly the same thing.
Doug Rynda
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