NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Tim Ingham
Date: 2022 Jul 15, 20:52 -0700
Can anyone clarify what changes are required to be applied to the originally quoted latitude and longitude of a point which was based on when “Greenwich Meridian” was the zero Meridian and now, when Lat and Long are quoted in terms of WGS 84 and the zero meridian is about 5.3” east of the “Greenwich Meridian”.
The query is prompted by a check on some data quoted in Lecky’s Wrinkles in navigation (1884) which claimed 2 locations, St. Paul’s rocks and Cape Agulhas Lighthouse to be “Both of these are very accurately observed positions”. The other locations are taken from his List of Time Signals.
Also, I appreciate the need for caution when quoting “Mr Wikipedia”, but what information is there on the accuracy of Google Earth’s Lat and Long positions?
