Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Corrections for latitude when taking sights
    From: David Pike
    Date: 2019 Mar 13, 01:29 -0700

    The watch time of sunrise/sunset, at a place 90° different in latitude from your own, gives the time when the Sun is due east or west of you at your own latitude.  Prime Vertical, the best time to do time sights for longitude by chronometer, and reduce and simplify the wretched mathematics involved.  Brian Walton

    PS.  I don't see how this could possibly work in the winter Brian, because when the Sun is rising in your opposite hemishere, it's still dark in your own.  Similarly, when the Sun's setting in your opposite hemisphere, it has already set in your own. I'm fighting the urge to test this with 'Navigator'.  Otherwise I'll never get this Appleyard Computer finished. DaveP

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    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)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site