NavList:

Frank,

I got LAT = 34.83°N and LON = 67.13°W. Lat was from the Polaris sight. I made the assumption that one could average the Venus sights since the time intervals either side of 00:35:00 UT were nearly identical (10:05 vs 10:08). This gave Hs = 21.24° after correcting for IC, dip and refraction. I then added 0.2 for parallax that I got from the USNO web app clone, giving me an Ho of 21.25°. GHA and Dec equaled 142.47° and 16.62°. Running the A,B, C equations gave me a LON = 67.13° W.

thanks,
Roger

I'm approaching Bermuda from the northwest. It's June 25, 2023 (local date). I have a nice new Astra IIIB sextant with a 7x scope (*). I shoot Venus in early twilight. Height of eye is 25 feet. Sextant index correction is -1'. My estimated position a few minutes before taking sights is 35.00° N, 67.15° W. I'm sailing on course 150°T at 6 knots.

At 00:24:55 UT (so the Greenwich date has rolled over to June 26), I shoot Venus, nearly due West. I get Hs 23°28.5'.
Can't see Polaris quite yet in my sextant, though it's visible naked-eye...

Darker and darker...
At 00:35:00 UT I shoot Polaris. The raw sextant altitude, Hs, is 34°28'.

At 00:45:08 UT I decide to shoot Venus again. I get Hs 19°18'.

So what is my 0035 fix?