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, 22:42 -0400
From: Frank Reed
Date: 2007 Oct 27, 22:42 -0400
Alex wrote: "One alternative explanation offered was that the eye pupil becomes larger in the darkness:-)" And Greg, you asked: "Agreed - which would reduce the depth-of-field, but how exactly would that improve the eye's resolution?" It wouldn't. The idea is that the enlarged pupil uses a much bigger portion of the lense+cornea and these are very imperfect optically, so as your eyes dark-adapt, stars which should be point-like become flared. You can see fainter stars when you've dark-adapted, but tht eye's resolution generally falls. -FER --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
