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: Navigation News article on leap seconds.
    From: George Huxtable
    Date: 2005 Oct 10, 00:03 +0100

    Jared Sherman wrote-
    >But if a billion Chinese each picked up a rock and threw it eastward, once
    >a day
    >every day, the Earth would accordingly spin faster.
    >It is left as a trivial calculation to the reader to determine the
    >required mass
    >of the rocks to offset the typical slowing of the earth.
    Sorry, Jared, no.
    Throwing a rock Eastward would, for a moment, give an impulse to the Earth,
    but that would be in a Westward direction, which would tend to reduce the
    speed of the Earth (which spins Eastwards). But as soon as the rock came to
    a stop as it hit the ground, it would give an equal impulse back to the
    Earth in the opposite direction. So only a transient effect. Not really a
    feasible project, not even for a billion Chinese.
    Contact George at george@huxtable.u-net.com ,or by phone +44 1865 820222,
    or from within UK 01865 820222.
    Or by post- George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13
    5HX, UK.

    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