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: Nautical astronomy was different
    From: Bruce Stark
    Date: 2004 Oct 22, 13:14 EDT
    Jared,

    You said: "
    So what Bowditch said translates into modern Ynglitch as:

    'The accuracy of a lunar depends upon the proper maintenance [control,
    upkeep, performance monitoring and adjustment] of the chronometer.' "

    That's probably as good a guess as we can make from our present perspective. But, in this instance, we don't have to guess. In his next paragraph, Bowditch tell us what he means.

         "The best method of regulating a chronometer at sea, is by taking an altitude of the sun when rising or falling quickly, or when bearing nearly east or west, the altitude being sufficiently great to avoid the irregular refraction near the horizon, and noting the time by the chronometer. With this altitude, the latitude of the place, and the sun's declination, find the mean time of the observation by either of the preceding methods: the difference between this time and that shown by the chronometer will show how much it is too fast or slow."

    The "preceding methods" he refers to are under the title: "To Find the Time at Sea, and Regulate the Watch, by the Sun's Altitude." They are two ways of working a time sight.

    Time sights were called "observations for the time" back then. Apparently the term "sight" hadn't wasn't used until later.

    Bruce
       
    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)