NavList:

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

HOME

Re: Scale of Intercept
From: David C
Date: 2020 Feb 1, 19:16 -0800

To recap...... I did not know where I was. By various means I concluded that I was somewhere in the southern ocean near New Zealand:

I determined the approximate time of noon and estimated that my long was about 174°E.

I took a sight when the sun was on the prime vertical which gave a long of about 176°E.

By various means I concluded that my lat was somewhere between 22°S and 52°S.

I selected 52S 174W (not a typo) as my AP. Why W I do cannot remember. I wanted an extreme AP but I think I may have made an arithmetical mistake.

I worked the long by chron as an intercept. I then took a sight with my AH when Ho was < 60° and calculated the intercept. I plotted the intercepts on google-earth and selected 43°S 176°E as a new AP. I chose in integral number of degrees so I could work the sights with 214.

I have not yet used the new AP but from the diagram I can confidently conclude that the solution is converging.

File:

What is NavList?

NavList is a community devoted to the preservation and practice of celestial navigation and other methods of traditional position-finding. We're a group of navigators, navigation enthusiasts and hobbyists, mathematicians and physicists, and historians interested in all aspects of navigation but primarily those techniques which are non-electronic.

To post a message, if you are already signed up as a NavList member, start a new discussion or reply to any posted message and use your posting code (this is a simple low-security password assigned when you join). You may also join by posting. Your first on-topic messsage automatically makes you a member, and a posting code will be assigned and emailed to you for future posts.

Uniquely, the NavList message boards also permit full interaction entirely by email. You can optionally receive individual posts or daily digests by email, and any member can post messages by email (bypassing the web site) by sending to our posting address which is "NavList@NavList.net". This functionality is similar to a traditional Internet mailing list: post by email, read by email, reply by email. Most members will prefer the web interface here for posting and replying to messages.

NavList is more than an online community... more about that another day.

© Copyright notice: please note that the rights to all messages and posts in this discussion group are held by their respective authors. No messages or text or images extracted from messages may be reproduced without the explicit consent of the message author. Email me, Frank Reed, if you have any questions.

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

NavList:

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

Compose Your Message

NavList

What is NavList?

Join / Get NavList ID Code

Retrieve a NavList ID Code

Email Settings

Custom Index

Add Images & Files
Name or NavList Code:	Email:

Name:
	(please, no nicknames or handles)
Email:

NavList ID Code: