NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Nav Exercise #4- Amplitude of the Sun
From: Bill B
Date: 2008 May 25, 00:52 -0400
From: Bill B
Date: 2008 May 25, 00:52 -0400
> From: Anabasis75@aol.com > > "To observe the altitude close to zero, the Sun should be observed when the > lower limb lies about a semi-diameter above the horizon, and the Moon when the > upper limb touches the horizon - at the time of appearing and disappearing" > I openly and freely admit to not having delved into "amplitude." On the other hand, I proposed using sunrise and set, without a sextant but rather with binoculars, to derive a LOP long ago. I may well be, as is often the case, off track. The scholarly replies dissuaded me from attempting that, other than in lifeboat conditions, as refraction may be a a wild card (fuzzy variable) at those times. Feedback, or a layman's explanation of "amplitude." Bill B. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
