NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Halley's lunars, back in 1698-1700 (corrected)
From: George Huxtable
Date: 2004 May 5, 19:34 +0100
From: George Huxtable
Date: 2004 May 5, 19:34 +0100
Sorry to say that I've detected a couple of careless errors in my posting about Halley's lunars earlier today. So I had better correct them before someone else does. There may of course by further errors, as yet undiscovered. In the first paragraph was a mention of- "his two voyages around the Atlantic, in the British Navy 89-ton pink "Paramore", as early as 1698-69 and 1699-70." The date of the first voyage should, of course, have been 1698-99, not 1698-69. After quoting a passage from Halley's log, I added- "Note that Halley makes a step-change in his presumed long. at noon, from his DR value of W 31deg 13' to a new value, based on his lunar, of W 36deg 35', a change of 5deg 20' or nearly 500 miles! That change in longitude should have been 5deg 22', not 5deg 20', which corresponds to 300 miles, not "nearly 500 miles". Sorry about that, George. ================================================================ contact George Huxtable by email at george@huxtable.u-net.com, by phone at 01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. ================================================================
