NavList:
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Re: Silicon Sea: Leg 82 results
From: Brian Whatcott
Date: 2001 Dec 16, 9:15 AM
From: Brian Whatcott
Date: 2001 Dec 16, 9:15 AM
At 01:07 AM 12/16/01, Paul Hirose's working began: >Silicon Sea Leg 82 answers. Solution by 10-inch slide rule and >mid-latitude sailing. For the Sun lines I used the U.S. Naval >Observatory Web page, not having a current almanac. However, I >interpolated the coordinates between exact hours to simulate the >almanac as closely as possible. > >Compute course to landfall at Hawaii: > >19 30 N destination lat. >11 30 N fix 2001 July 11 0340 >----- > 8 00 DLat (lat. diff.) = 480 min > >154 45 W dest. lon. >132 30 W fix 2001 Jul 11 0340 >------ > 22 15 DLo = 1335 min > >15.5 Lm (mid lat) = mean of dest. & fix lats > >1289 p (departure) = DLo cos Lm > > 290 C (course) = 360 - arctan(p / DLat) > -11 correction for variation & deviation >---- > 279 CC (compass course) > >1368 nm Distance = p / (sin C) >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I found this note was an exceptionally helpful hand-up for a beginner. Thanks Brian W Brian Whatcott Altus OK Eureka!
