NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Help with Lunar distance.
From: George Huxtable
Date: 2010 May 11, 10:11 +0100
From: George Huxtable
Date: 2010 May 11, 10:11 +0100
Paul Jackson wrote, on 9 May- "I took a Lunar distance in position - 36 48.0 S - 174 46.0 E @ 9 Days 18 hours 15 min 52 sec on the 9th of may 2010. Calculated Alt moon 20 33.9 Calculated Alt Jupiter 22 02.6 Distance near limb moon & Jupiter = 7 20.8 My Navigator software gives me a lunar time of 2:57:42 GMT how can this be, can you guys at Nav List Help." He added an attachment, which seemed irrelevant. We have agreed that his calculated altitudes for both Moon and Jupiter from that place at that time are seriously in error. Paul seems prepared to dismiss that result and go on to take another lunar. But that won't answer the question of what was going wrong. Where, I ask Paul, did those altitudes that he quoted come from? Did he calculate them himself? If so, how? Or did he take them from some "Navigator software" that he refers to, which he hasn't yet identified to us? In which case, what, exactly, were the numbers that he fed into that program? If he feeds in those same numbers again, does he get the same results? If Paul wishes to ask Navlist for help, which is willingly available, he should be prepared to supply backup information so that we can get our teeth into his problem. Something has gone seriously wrong, and unless, between us, we can identify what it is, the error won't go away. George. contact George Huxtable, at george@hux.me.uk or at +44 1865 820222 (from UK, 01865 820222) or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.