# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Question Re: Position by Calculation
From: Rick Gay
Date: 2014 Jan 15, 21:39 -0500
Whenever I can!  Which turns out to be about once every three months…

On Jan 14, 2014, at 2:48 PM, Hanno Ix <hannoix@gmail.com> wrote:

I am elated!

Finally, I there is one other one who does
CelNav arithmetics by hand!

I wonder if there are more who can muster
the challenge.

Thank you, Bruce.

H

On Fri, Jan 10, 2014 at 8:08 PM, Bruce J. Pennino wrote:

Hello:

I have not done one of these problems in a while and my brain is a bit (or more than a bit) rusty.  All of my values are close except for Dubhe, and I can't find error. Since I don't have HO 249 volume 2, I solve  HC and Cos A equations.   Could someone post their specific final sight reduction for Dubhe or check my values below?

I now see the quick beauty of Weems for all latitudes, I usually use HO 249, volume 3 or do hand calculator solution . I recently  purchased Weems 4 th edition LOP book.  I can mostly make sense out of it, but the wording is so brief that I really can't visualize the trig solutions. Would appreciate someone sending in a reference that I could study.  For the 1/5/2014 problem Dubhe:

Time: 12:05:42; AP lat 37* 00N; dec N 61* 40.1; GHA Aries = 286* 26.1' ; SHA= 193* 51.0'; GHA 120* 17.1; AP Long 76* 17;  LHA = 44*; HO = 53* 31.2'; HC 53* 21.4' ; int = 9.8 ' A;  ZN = 326.5* END

Many thanks.

Bruce

----- Original Message -----
Sent: Wednesday, January 08, 2014 6:18 PM
Subject: [NavList] Re: Question Re: Position by Calculation

Attached is the VEGA Hc sight reduction done for both Weems and Dreisonstok on one side of an index card. No form needed.
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rjg

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