NavList:

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

HOME

Re: A page from my log
From: Paul Hirose
Date: 2024 Feb 16, 11:19 -0800

On 2/10/2024 7:06 AM, NavList Community wrote: > Plotting two lat/lon points (calculated by > calculator) and drawing a line between them is IMHO much easier than > plotting a point, measuring an angle, drawing and measuring a line and > then drawing a second line at right angles. This is a variation on the > time sight method except that the result is a position line rather than > a longitude that is dependant on an (in)accurate latitude. Also not > having to calcuate azimuth eliminates the NSEW to 360 degree confusion. It's not necessary to calculate azimuth and draw a line toward the body. You can work directly with azimuth angle Z and omit the azimuth line. Begin by orienting the edge of the protractor east - west. Suppose the body is west of the meridian and you're in the northern hemisphere. Turn protractor counterclockwise by the azimuth angle. Move it to the assumed position, then shift it toward or away according to your calculated intercept. Now draw the LOP. This is simple with a square protractor, though it may not be possible with other drawing instruments. -- Paul Hirose sofajpl.com

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: