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
    Port Time
    From: Don Seltzer
    Date: 2014 Mar 2, 14:24 -0500
    The discussion of Railroad time has me wondering about Maritime time.  In the early 19th century, most major ports provided a time service, in the form of a 1 o'clock gun or time ball, for the use of mariners to set or check their timekeepers.

    Did these local keepers of the time announce local time, requiring the mariners to make the necessary correction to Greenwich (or some other standard)?

    And how were these local time signals determined?  Observation of the sun's meridian passage by set north-south reference marks, or by use of a high quality chronometer with occasional celestial checks?

    Don Seltzer

    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