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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Fw: Chichester
From: Gary LaPook
Date: 2008 Dec 12, 03:57 -0800
From: Gary LaPook
Date: 2008 Dec 12, 03:57 -0800
Ah yes, I see the problem. I have been using the sine-cosine formulas with a calculator that uses natural trig functions of no problem with using logarithms of negative values of the trig functions. You can work around the problem caused by contrary names of latitude and declination by subtracting the second term instead of adding it. However you can't do this with LHA between 90� and 270� which result in negative values of cosine which would then result in the problem you identified, trying to determine a log of a negative number.Thanks. gl waldendand@YAHOO.COM wrote: > sine-cosine works ok when sine and cosine are postitive. > > logs of negative values are trouble. > > > > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
