When I was a deck cadet my chief officer told me the rule to calculate tha approximate time of sunset: When the the sun is near the orizon take you arm extended so your fingers be parallel to the horizon. Each finger is ten minutes to sunset. F.Martinelli ---------------------------------**----------------------------------- Istituto Tecnico Nautico Statale "ARTIGLIO" Viareggio (LU) [EMAIL PROTECTED] http://www.nauticoartiglio.lu.it -----------------------------------------**-------------------------- -----Messaggio originale----- Da: Steve Lelievre <[EMAIL PROTECTED]> A: Sundial mailing list <[email protected]> Data: lunedÏ 24 gennaio 2000 3.23 Oggetto: Rules of thumb
>I'm relatively new to dialing, and indeed this is my first post to the >mailing list (but I've lurked here for a few months). I'm also a great >enthusiast for using "rules of thumb" in everyday life, but so far I've not >found many cases where I can put the two together. I'm hoping that this >posting will lead to a discussion about rules of thumb which bear on >sundials / sun naviagation / sky navigation. > >Here are a few examples of the kind of thing I mean: > >- Point the hour hand of your watch in the direction of the sun. Divide the >angle between the hour hand and the 12 o'clock position. This shows you >where North/South are. > >- Put a stick in the ground. Use a pebble to mark where the tip of the >shadow is. Wait a few minutes, now make a line from the pebble to the new >position of the shadow tip. This is an East-West line. > >Of course, these two are not accurate - rules of thumb often aren't - but >I'm hoping a few gems will turn up. Anybody got any, good or bad? Especially >ones for telling the time. > >Steve > > > > >
