NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lunar distance accuracy
From: Frank Reed
Date: 2007 Oct 27, 22:45 -0400
From: Frank Reed
Date: 2007 Oct 27, 22:45 -0400
And I see Michael Daly has already posted this much more detailed reply: "A larger pupil exposes more of the cornea/lens to the light and allows more opportunity for astigmatism to come into the image. If you have generally good vision but off-axis astigmatism, it is not noticeable until the pupil is large. Larger pupils can also reveal early cataracts (they tend to start from the outside of the lens) that can mess up the image. These kinds of things start to show up in daylight for some folks who start using various eye medications that cause pupil dilation (like some glaucoma meds)." Very glad you joined the group, Mike! BTW, in case you hadn't guessed, I was the one who posted that anonymous invitation on the Discussion page for the Wikipedia lunar distance article. -FER http://www.HistoricalAtlas.com/lunars --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
