Hi Donald, The sundial I created with the help of Tony Moss in Longyearbyen, Norway, can be read by moonlight - if you want to see an explanation please go to www.longyearbyen.net/sun Hope you find what you're after! Louise Rigozzi
Phone: 00447792550052 From: patrick_pow...@compuserve.com To: sundial@uni-koeln.de Subject: Re: sundial read from moonlight Date: Sun, 31 Jul 2011 07:59:36 +0100 Hi Donald I cannot help you with an article on that specific topic but there is a dial at Queens’ College Cambridge which has at its bottom a table of corrections to be used to tell time by the moon. An article published by the University (courtesy Drs Robin Walker and Frank King) is at http://www.queens.cam.ac.uk/page-241 It describes the dial and includes mention of the table and how it should be used. These corrections apply to all dials, not just to that at Queens’. I hope it helps; but I have to say that when even when you do make the requested corrections the resulting time may still be quite inaccurate! The moon’s motion is much more complicated than can be described by a few simple integers. Patrick From: Donald Christensen Sent: Sunday, July 31, 2011 1:14 AM To: f.w.m...@rug.nl Cc: sundial@uni-koeln.de Subject: Re: sundial read from moonlight Sorry I wasn't very clear with my question. I'd like to know how to read a horizontal sundial in the moonlight. I wish I could find the artical that I read on it. I'm going by memory so this is probably wrong but it went something like this: On a full moon, a horizontal dial reads correct. For each day after a full moon, 43 minutes must be addet to the time. Likewise, for each day before a full moon, 43 minutes must be subtracted to the time. On 7/31/11, Frans W. Maes <f.w.m...@rug.nl> wrote: > Dear Donald, > > One can use the moon's shadow as long as it is distinguishable at night, > say, one week either side of full moon. For an example, see: > http://www.fransmaes.nl/genk/welcome-e.htm, choose menu item 7 and > scroll down in the right-hand frame to "The moon dial". > > Best regards, > Frans Maes > > On 30-7-2011 10:23, Donald Christensen wrote: >> I heard that a sundial will read the correct time with the shadow on >> the moon on a certain day. (full moon?) >> > -- Cheers Donald 0423 102 090 This e-mail is privileged and confidential. If you are not the intended recipient please delete the message and notify the sender. Un-authorized use of this email is subject to penalty of law. So there! --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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