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Re: Silicon Sea: Leg 82 results

Subject: Re: Silicon Sea: Leg 82 results
From: Brian Whatcott (inet@XXX.XXX)
Date: Sun Dec 16 2001 - 11:14:58 EST

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!



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