NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2015 Apr 15, 11:18 -0700
Francis,
Thanks Greg. So was the Hs/Hc correct?
Your Hs for the Sun's lower limb 49° 5.3' should read 49°51.3' which is I'm sure what you had intended for Hs and is what I get based on USNO data. This puts Venus 5.2' above the lower limb of the Sun at LAN with an azimuth of 000°/360° for both the Sun and Venus.
But they used sextants for time sights
Time sights would have been done on Capt. Cook's second voyage with K1. Lunars would have been done on his first voyage which had the mission of observing the transit of Venus from Tahati.
Greg Rudzinski
From: Francis Upchurch
Date: 2015 Apr 14, 23:30 -0700Dave,
re.Cook and Hc/Hs. Yes, I think they did not use these pre-Sumner and St Hilaire, did they? But they used sextants for time sights and to get LAN to corrrect their accurate astronomical pendulum clocks I think? They also did lots of lunars.
All good fun anyway. Enjoy your pint! I've already had my "short pint"! Thanks Greg. So was the Hs/Hc correct?
Francis
