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Re: Lunar distance method of Chauvenet
From: Roger W. Sinnott
Date: 2020 May 26, 11:37 +0000

Paul,

Thanks for posting these worked examples from Chauvenet, which will help me debug my own lunar-distance program. But I'm curious why you are setting delta-T (or, ET - UT) equal to +10 seconds. According to the 2020 Astronomical Almanac, delta-T was +7.6s at 1855.0 and +7.7s at 1856.0.

Roger

-----Original Message-----

>  1855-09-07 08:07 UT1 (correct time)
>  +10 s delta T
>  35.5° N 30° W (correct position)
>  zero height of eye
>  75 F (24 C), air pressure 29.1 inches Hg (985 mb)
>
>  
>  1856-03-10 03:12:49 UT1 (correct time)
>  +10 s delta T
>  34°56.6' N 149°39.8' W
>  zero height of eye

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