NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Fw: need another formula
From: Frank Reed CT
Date: 2006 Jul 9, 21:56 -0500
Guy, you asked:
"Can someone share with me the formula to obtain the values that appear on
the Table "Correction to Tabulated alititude for minutes of declination?"
e.g.
d= 48
minutes = 45
answer from chart = 36"
Well, let's see... d is the rate of change in the spherical triangle
solution per degree of declination change. So if we convert 45 minutes to degrees by
dividing by 60 and then multiply by d... yep, I get 36. So the formula would
be
correction = (minutes/60)*d.
I don't have any sight reduction tables here to check against. Try a few
other examples, and let me know if it works.
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
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From: Frank Reed CT
Date: 2006 Jul 9, 21:56 -0500
Guy, you asked:
"Can someone share with me the formula to obtain the values that appear on
the Table "Correction to Tabulated alititude for minutes of declination?"
e.g.
d= 48
minutes = 45
answer from chart = 36"
Well, let's see... d is the rate of change in the spherical triangle
solution per degree of declination change. So if we convert 45 minutes to degrees by
dividing by 60 and then multiply by d... yep, I get 36. So the formula would
be
correction = (minutes/60)*d.
I don't have any sight reduction tables here to check against. Try a few
other examples, and let me know if it works.
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
