NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: FW: Re: Chronometer Suggestions
From: Nicolàs de Hilster
Date: 2009 Jan 15, 09:17 +0100
From: Nicolàs de Hilster
Date: 2009 Jan 15, 09:17 +0100
On NavList 7052 Irv Haworth wrote: > "I think it's well known that 1' of arc varies in length as a function > (cos) > of the latitude." > > On which Gary LaPook replied in NavList 7053: > That is true for one minute of longitude because parallels of latitude are small circles. > This is not true for one minute latitude of for any > other great circle. (Technically these also vary slightly due to the > oblateness of the earth but these small variations are ignored for > celestial navigation purposes.) > For those who want to know how much exactly that variation is I posted attached graph of it in NavList 4750 on 24/03/2008. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
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