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Re: Lunar longitudes, not by lunar distance.
From: Hanno Ix
Date: 2009 Aug 8, 10:15 -0700
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From: Hanno Ix
Date: 2009 Aug 8, 10:15 -0700
Gentlemen: Thanks for agreeing so graciously. Would you, too, like to proceed to more technical issues? 1. The transit. Searching for a suitable instrument I found an old invention on the net. Would you please take the effort of loading down from Google Patent the US patent 239,315. It carries the title: Altitude Instrument, and was issued to S.C.Chandler of Boston on March 29, 1881. The instrument is of simple construction, and it is not out of he question for a hobbyist to reconstruct it .The drawings show an instrument a microscope.resembling in size and shape and are clear enough to understand its mechanics and optics. BTW: Who was S. C. Chandler? J. Palisa, at that time Director of the Observatory in Vienna, Austria, reported on its practical use. Thanks to the present officers there, I have now in hand two reports by Palisa on his experiments - one in German, the other in French. I have yet to find out the exact citations. According to the reports, Palisa made experimental observations in 1888 at Vienna. The instrument he used had been built by Hartmann & Braun. According to Wikipedia, the Co existed independently from 1882 until 1999.It was located around Frankfurt, Germany. It's records are said to be kept at the Historical Institute of the City of Frankfurt Palisa says the actual implemetation included several improvements suggested by his Institute. Palisa refers to the instrument as a Chronodeik. I am still studying the reports. Perhaps you can assist in locating reports about the Chronodeik in the English language? I am eager to find out what accuracy he might have achieved. Would it be sufficient for a practical test of our concept? If you have other idea re: a suitable astonomicals transit taht van be taken along please inform us. 2. The sight reduction. I am a novice. So, if you kow how meridian transits is properly reduced please let me know, too. Palisa gave some hints. 3. DT. I reckon, Chauvette's methods are too cumbersome today when my PC can calculate accurate epherimides. I assume there are fancy programs on the market that could calculate ephemerides. However, I have MATLAB, a rather complete technical system, and would love to calculate and tabulate DT myself. Best regards, and a happy weekend! H --- On Sat, 8/8/09, George Huxtable <george@hux.me.uk> wrote:
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