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: Frank Worsley's Sextant: the certificate
    From: Greg Rudzinski
    Date: 2014 May 23, 16:57 -0700

    Good catch Orjan.

    There must be a typo of some kind. At the equator 4 seconds of time equals 1' ( 1 nautical mile). For Worsley's the chronometer error seconds has to be multiplied by the cosine of the latitude then divided by four. That's about 0.6' per 4 seconds of time as I see it. I don't think there was much of a chronometer problem as long as the 11 minutes and 55 seconds was applied to the chronometer. Worsley would have surely done this.

    Greg Rudzinski


    Re: Frank Worsley's Sextant: the certificate
    From: Örjan Sandström
    Date: 2014 May 23, 16:10 -0700
    Uhm. 5 seconds of time is closer to 1' then the 20' given in the document, but that is me speaking. as far ad i know the rule of thumb is 4 seconds to 1' so things seem switched around there.

    -
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    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