I'd say postcode ends with 78, based on: Latitude: 43º42, after adding solar declination (90º-47º53'+1º35') Longitude: at 5:15, you see at the Nautical Almanac, 'Meridian passage at Greenwich' at 11:54:03. You recorded local noon at 17:33 GMT, therefore you are 5h 39 m = 5.65 h behind the meridian of Greenwich. Otherwise, I could have seen that the equation of time for 18/09/2021 (notice date in European notation 😉), 5' 55'', consistent with the read Greenwich noon time. That would mean latitude = (5.65/24)*360 = 84º45' West. I have a slight doubt if I should have used sidereal day instead of 24 hours day, but I think not, sidereal is primarily for stars. I'm not familiarized with the US postal codes, but I'm afraid something is wrong, this is possibly a bit South for 'Northern' Michigan.
Also, notice the low solar declination, consistent with a date close to the equinox.
I'd say postcode ends with 78, based on:
Latitude: 43º42, after adding solar declination (90º-47º53'+1º35')
Longitude: at 5:15, you see at the Nautical Almanac, 'Meridian passage at Greenwich' at 11:54:03. You recorded local noon at 17:33 GMT, therefore you are 5h 39 m = 5.65 h behind the meridian of Greenwich. Otherwise, I could have seen that the equation of time for 18/09/2021 (notice date in European notation 😉), 5' 55'', consistent with the read Greenwich noon time. That would mean latitude = (5.65/24)*360 = 84º45' West. I have a slight doubt if I should have used sidereal day instead of 24 hours day, but I think not, sidereal is primarily for stars.
I'm not familiarized with the US postal codes, but I'm afraid something is wrong, this is possibly a bit South for 'Northern' Michigan.
Well done Beta, you are 7.5 nautical miles off. Nearly what I got. WELL DONE!!!! You are off on the postal code but correct for your estimate
nice explanation, Bob. 7,2nm is way better than my last reading. But what about the hump in the water? ;) Keep the world turning.
17
Well done