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

    Jared Sherman wrote-
    
    >slowing.>
    >
    >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.
    
    George.
    
    
    ===============================================================
    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.
    
    
    

       
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