NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Answers to Leg 84
From: Dan Hogan
Date: 2002 Oct 6, 09:44 -0700
From: Dan Hogan
Date: 2002 Oct 6, 09:44 -0700
On 4 Oct 2002, at 18:29, Arthur Pearson wrote: > 1) ZT = 16:27 on 20/7/02 Uhh..recheck this. ALL you need is time of Sunrise at Hilo + the elapsed time to the departure FIX. > 2) Using Mercator calculations in CelestNav, total distance of all legs > is 303. Off a little. I have found CelestNav to be "tricky" because of what it wants in info. The problem is just a DR traverse from point-to-point. > 3) 303/9.3 = 32.6 hrs = 32 hrs and 36 min. Close > 4) Sight directly overhead is very difficult, hard to know where to > bring it down. That said, declination on this day = 20d 31' which is > therefore our approximate latitude, which corrects or DR latitude by 7 > miles) Right > 5) Solving the sights in Celestnav and plotting them yields 26d 00'N and > 157d 00' W. CelestNav fix calculation yields the same position exactly. OK > 6) Mercator calculations in CelestNav give TC = 102, D = 4.8nm. Current > has negligible effect on course to steer, corrections of Var. and Dev. > give CC = 90.5 (anyone who can steer within 0.5 degrees, please email me > with instructions) OK > 7. Speed adjusted for current = 9.1. Divided into distance yields T = 32 > minutes. Look over the bow and you won't need the compass. OK [Sniped original message] Dan Hogan dhhogan1@earthlink.net