NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Basics of computing sunrise/sunset
From: John Huth
Date: 2009 Jun 17, 16:51 -0400
From: John Huth
Date: 2009 Jun 17, 16:51 -0400
16 minutes is the half diameter of the sun?
--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
On Wed, Jun 17, 2009 at 4:41 PM, Christian Scheele <scheele@telkomsa.net> wrote:
I'm trying to solve the following sunrise/sunset astronomical triangle and
am encountering unexpected pitfalls.
cos(LHA) = [sin (a) - sin (lat) sin(dec)]/ cos(lat)cos(dec)
where I am assuming a = -0.83 degrees
It is of course something very basic and I'm almost embarassed to say that
although I keep rechecking what I'm doing, I remain with an error of about
15 minutes by the time I get to the final result in mean zone time. Before I
drag everybody into it, could somebody please tell me whether there are any
snags that I should look out for?
--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---