Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Re: Jack Aubrey's fixing of longitude
    From: Michael Dorl
    Date: 2011 Jun 20, 10:20 -0500

    In O'Brian's book, HMS Surprise, Aubrey fixes the position of an island thus:
    "...Jack had set up his instruments and where he and his officers were gazing up at the pale moon, with Venus clear above her......  The instruments stood on a carefully levelled patch of sand, and as the great moment approached, the tension could be felt.....  A deadly hush fell over the group, broken only by Jack's voice reading off figures to his clerk.
    "Two seven four," he said, straightening his back at last.

    Assuming an occultation, doesn't the fact that Venus was above the moon before the event mean that the event took place in the West as they were both descending?
    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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