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: James N Wilson
Date: 2009 Jun 18, 20:37 -0700
From: James N Wilson
Date: 2009 Jun 18, 20:37 -0700
Frank: Having viewed the last six total solar eclipses, I can now worry about the conditions immediately preceding totality. We use either eclipse glasses or a hand held shade to shield our eyes until totality, but never worried about the transition. It's so abrupt that it's breathtaking. The idea of dropping the shades before totality never occurred to me. Actually, for the last two I kept them up too long, wondering why everything was suddenly so dark. We were always advised to never look at the pre-eclipse sun through binoculars, even with shades. But during totality, they're indispensable, allowing us to see local sun activity like sunspots and solar flares. I find that 10x20 are perfect, where the sun fills the field. Of course, your same warning applies at the end of the eclipse, when the full sun reappears, again dramatically. Jim Wilson ____________________________________________________________ Get your dream car or truck. Click here. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
