From: Frank Reed
Date: 2017 Apr 6, 10:47 -0700
Peter Hakel, you wrote:
"Latitude: S 66° 39.9' Longitude: E 80° 01.7' "
Could you double-check that? That seems to be a long way off, and I wonder if maybe there's some substantial error... like using the wrong year?
For what it's worth, by plotting the altitudes on graph paper, folding in half for axis of symmetry, I get a time of 6:39:58 UT. Then there's about 17 seconds correction since the Sun is approaching us at 0.7 knots. The equation of time is about 5:51. Adding those onto 12:00:00 gives a local mean time of 12:06:17. Subtracting UT from that yields a longitude of about 81° 35' E. Obviously the latitude is easy, too (using a "noon" altitude of 7° 9.4'), but as others have noted, there's some ambiguity regarding the nature of the 'sights' so I won't work out an actual value for the latitude.