NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2010 Mar 1, 20:55 -0800
Antoine, you wrote:
"Well, ... when I compare my results with Frank's On Line Computer results, I am getting differences up to ... 0.2' for distances and 5.1' for Longitudes in the case of the Emersions. It is true that I cannot fully check my numbers against Frank's ones since I cannot enter tenths of seconds of time on his On Line Computer, and I am also restricted to tenths of arc minutes. This constraint certainly may have a significant, but quite limited effect here, but ..."
Just so you know, you can enter with finer precision by setting values in the URL after you get to the results page. If you know a bit of HTML and have access to a simple site, you can also very easily write your own input page to access the same calculating page on my site. Let me know if you have any questions on either of these approaches.
You also wrote:
"... Given the fact that for "conventional" Lunars, I always get within 0.3' of FER's results for Longitude differences, which always equate to 0.0' in Distances, I am just surprised that for occultations, our differences are so (relatively) important.
Such differences would almost amount to being quite frightening !!! :-)))"
You may also want to investigate the software tools developed by the IOTA folks. They calculate occultations to a fraction of a second AND they include the lunar limb profiles.
-FER
PS: You also wrote:
"Thank you also Frank for your very valuable insights in Navlist # 11804 "
Well, you're welcome. But could I ask you please NOT to reference posts by message number or at least not ONLY by a message number? This really defeats intelligibility. Couldn't you have just as easily said something like "thank you for your comments on the lunar limb and libration"? I really didn't know what you were referring to and had to go dig this up in the archive. Please consider the message numbers, not as a substitute for meaningful references, but as a backup in case you can find no other way to describe the point(s) you're referring to. Thanks! :-)
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