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> *From: *Antoine Couëtte
> *Date: *2024 Apr 11, 06:42 -0700
>
> Interestingly, for N46°36'24" / W 057°36'49" / 0 m above WGS 84
> Ellipsoid (/confirmed by EGM08
> /) , 
and for Aug 08th, 1776 (TT-UT = + 15.6s) :
>
> Starting Eclipse at UT = 16h42m30.7s

The above date is wrong. I could not get an eclipse until I found the
correct date in the first message of the thread.

The small UT1 discrepancy in my data is an artifact of the output
formatting in Lunar. It does not affect UT1 in the computation.

If "computed Moon to Sun" angle is negative, the limbs overlap. In
parentheses is the angle computed with Kermit's value of TT-UT1. In each
case there's only 2" difference.


1766-08-05 16:42:30.73 UT1
1766-08-05 16:42:51.33 TT

  -57°36'49" +46°36'24"  east lon, north lat
0.0 meters (0 feet) above ellipsoid

topocentric apparent Moon to Sun angle
   0°31'14" center to center, unrefracted
      0'01" refraction
   0°31'13" center to center, refracted
    -14'54" Moon near limb refracted SD
    -15'46" Sun near limb refracted SD
   0°00'33" computed Moon to Sun (35")


> Ending Eclipse at UT = 19h35m04.0 s

   0°29'46" center to center, unrefracted
      0'01" refraction
   0°29'46" center to center, refracted
    -14'50" Moon near limb refracted SD
    -15'46" Sun near limb refracted SD
  -0°00'51" computed Moon to Sun (-53")

--
Paul Hirose
sofajpl.com

   

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