# NavList:

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

Message:αβγ
Message:abc
 Add Images & Files Posting Code: Name: Email:
Re: Question Re: Position by Calculation
From: Bruce J. Pennino
Date: 2014 Jan 11, 13:14 -0500
﻿
Greg:

Many thanks! It is the obvious mistakes that one overlooks.  All three intercepts plotted in the wrong direction and my triangle was sort of "flipped over". I wondered about that, but did not think it through!  I probably won't make this mistake again!.

Best regards.

Bruce

----- Original Message -----
Sent: Saturday, January 11, 2014 12:48 AM
Subject: [NavList] Re: Question Re: Position by Calculation

Bruce,

Your intercept should be 9.8' toward since Ho is larger than Hc.

Greg Rudzinski

Re: Question Re: Position by Calculation
From: Bruce J. Pennino
Date: 2014 Jan 10, 23:04 -0500
﻿
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

----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------

View and reply to this message: http://fer3.com/arc/m2.aspx?i=126286

Browse Files

Drop Files

### Join NavList

 Name: (please, no nicknames or handles) Email:
 Do you want to receive all group messages by email? Yes No
You can also join by posting. Your first on-topic post automatically makes you a member.

### Posting Code

Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
 Email:

### Email Settings

 Posting Code:

### Custom Index

 Subject: Author: Start date: (yyyymm dd) End date: (yyyymm dd)