NavList:

Roger Errington, you wrote:
"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."

Hmm. I would suggest running the latitude by Polaris again. It doesn't seem quite right. Did you first do the dip and refraction correction? And then follow that by the Q correction? Could your share your values for GHA Aries etc.? Your ideas on the Venus sights sound spot on! In particular you noticed that there's a parallax correction for Venus which, though small, might not be dismissed as insignificant. I think I would normally ignore 0.2' for an altitude sight, but in a few more weeks that Venus parallax will double. :)

Thanks for adding your analysis here.

Frank Reed