NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Longitude by Sunset
From: Alexandre Eremenko
Date: 2012 May 7, 12:24 -0400
From: Alexandre Eremenko
Date: 2012 May 7, 12:24 -0400
Greg, > I use this Bris with a digital camera. I understood. When I was contemplating this Mun/Moon rise/set method, I had one application in my mind, besides the pure theoretic interest: a lifeboat equipment:-) I was thinking of something like a map, magnetic compass, reduced almanac on plastic sheets, and a plastic sextant/quadrant. It is highly probable that at least one person in a lifeboat will have her wristwatch:-) Of course, no problem with adding a graduated "Bris sextant". But to equip a lifeboat with a digital camera and a computer... and batteries... :-) But of course a digital camera is OK for a preliminary research:-) Alex. P.S. About 5-6 years ago I bought a 10 EU watch in an airport when my own watch stopped because I swam with it. I came home and put this 10 EU watch to a drawer. Today I was searching something in this drawer, and discovered that watch. It is 5 min ahead of time:-) So equipping a lifeboat with emergency watch is a good idea, but probably not with a chronometer:-) A. The reflected image isn't as bright as direct sunlight. At extremely low altitudes near sunset no sunglasses are need when the Sun is an orange ball. At higher altitudes with a different Bris then sun filters need to be added to the device. On the camera there is some flexibility with the exposure settings and in the electronic dark room. > > Greg Rudzinski > ---------------------------------------------------------------- > NavList message boards and member settings: www.fer3.com/NavList > Members may optionally receive posts by email. > To cancel email delivery, send a message to NoMail[at]fer3.com > ---------------------------------------------------------------- > > > > > : http://fer3.com/arc/m2.aspx?i=119443 > > >