A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2017 Dec 26, 07:45 -0800
Thank you for publihing your first Moon-Star Lunar.
Although I am not familiar with the method you are using - definitely a simple one - nor with your subscripts (see also a pending post named "Publishing heights" ), I might have found a typo in your published data, which gave me a good headache to solve.
Now, I am convinced that "Ho's" refers to geocentric heights.
Regarding such typo, please have a look immediately below :
Dec 24th, 2017 GMT 00:05:54 Moon's age was 5.7 days, a waxing crescent.
Using Reed's algorithm in my HP calculator ...
Ho 37deg 50.1'
Ho 36deg 10.7'
LDa 95deg 3.8' far should it not rather be “95deg 53.8’far ?”
LDpc 95deg 38.7' … especially since LDpc + SD+Aug =95deg 53.8’ ???
From my own software, with the [corrected typo] data you have published, I am finding that your clock error is below 2 seconds of time, which is also fully confirmed by Frank's Computer.
Here are my "backward engineered" height values, which are to be construed as "Sextant values with Height of Eye = 0 and instrument error = 0 " . Hence Refraction, ( 50°F, and 29.92"), [augmented] SD and parallax corrections remain to be computed. Here are my "raw data" which you can directly feed into Frank's Computer :
24 Dec 2017, UT = 00h05m54.0s (TT-UT = +69.5 s, not necessary here actually since Frank's has his own value which should be close enough from this one) . I am just hoping now that temperature has not gone above 50° F .
Observed Sextant Distance : 95°53'8 (far Limb), Aldebaran height : 36°12'0 , and Moon LL height = 36°52.3' or Moon UL height = 37°22'6
If you feed Frank's computer with these "backwards engineered" raw data, you will get an exceptional result : Error in Lunar 0.0' with Approximate Error in Longitude 1.0'
Additionally, and from your published data, once your typo is corrected, I am locating you at : N28°41'1 W082°17'9 , central Florida, yes ... not far from its West Coast.
What was your actual position then ?
Best Friendly Regards,