NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Index Card for Trig/Log Table
From: Andr�s Ruiz
Date: 2009 Sep 10, 07:47 +0200
From: Andr�s Ruiz
Date: 2009 Sep 10, 07:47 +0200
For Lat = 34�10'=34.1667� LOG(COS(RAD(Lat))) = -0.0823 And table vlue is: 100000*LOG(10*COS(RAD(Lat))) = 91771.9422 = 91772 Where LOG is the logarithm to base 10 Andr�s Ruiz Navigational Algorithms http://sites.google.com/site/navigationalalgorithms/ -----Mensaje original----- De: navlist@fer3.com [mailto:navlist@fer3.com] En nombre de Greg Rudzinski Enviado el: jueves, 10 de septiembre de 2009 2:47 Para: NavList Asunto: [NavList 9691] Re: Index Card for Trig/Log Table Hewitt, I'm using a U.S. Naval Institute 1959 edition hard cover table that contains a great set of easy reading tables. Ebay has some for under $10. My traveling trig/log table is a paperback Earl Milton Bigsbee 1977 edition that fits in the sextant box nicely but is a little bit hard to read due to the small print size. Greg On Sep 9, 2:12�pm, Hewitt Schlerethwrote: > Really interesting, Greg. What log/trig tables are you using? �-Hewitt > > On 9/8/09, Greg Rudzinski wrote: > > > An index card is handy when performing sight reduction with a trig/log table. I set my card up with pre computed entries that are good for a few hours of Sun celestial. The highlighted portions of the attached index card photos show what can be pre calculated before an observation is performed. The remaining computations can be performed at a leisurely pace in less than four minutes. The result is accurate to four places even when the the SIN product is calculated by slide rule. I like the trig/log tables because they are compact enough to fit into my sextant case along with a K&E 4070-3 slide rule . --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---