# 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: Gary LaPook
Date: 2014 Jan 13, 11:01 -0800
Weems computation using the Rust diagram

http://fer3.com/arc/m2.aspx/Fw-Chichesters-Calculations-SineCosinemethod-LaPook-dec-2008-g6745

Weems computation of azimuth using the B table.

http://fer3.com/arc/m2.aspx/Fw-Chichesters-Calculations-SineCosinemethod-LaPook-dec-2008-g6785

gl

From: Gary LaPook <garylapook@pacbell.net>
To: garylapook@pacbell.net
Sent: Monday, January 13, 2014 10:52 AM
Subject: [NavList] Re: Question Re: Position by Calculation

Here is a Dreisonstok solution:

http://www.fer3.com/arc/m2.aspx?i=106744&y=200812

And Weems:

http://www.fer3.com/arc/m2.aspx?i=106745&y=200812

gl

From: Bruce J. Pennino <bpennino.ce---.net>
To: garylapook---.net
Sent: Monday, January 13, 2014 10:07 AM
Subject: [NavList] Re: Question Re: Position by Calculation

﻿
Hello:

After seeing Greg's quick solution for Hc with Weems (1927) and Dreisonstok H.O. 208 I did a little checking into alternative methods for my use. Mixter's Primer of Navigation provides a brief review of "new" methods starting with Line of Position Book, Weems (1927). Weems is pretty easy to use but obtaining Z by "rules" is not so easy to follow.  But if you just make a sketch the quadrant is available and the extracted value allows getting Zn.

Instead of H.O. 249, I'm looking for an alternative short non-calculator method. Is Dreisonstok 1928 H.O. 208 an improvement over Weems, or is Ageton (1942) A.A.A. method in Manual of Celestial Navigation a far superior option??

It seems that Ageton's Manual is readily available  for relatively low cost (\$ 7.95 U.S. Amazon).  I'm probably going to try a bunch more problems with Weems, no matter what , since I "invested" \$ 7.00 for Line of Position Book.....big spender......

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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