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    Re: At the centre of time
    From: Douglas Denny
    Date: 2009 Oct 21, 12:29 -0700

    Further to the Greenwich Meridian and the Airey Transit instrument:
    
    I have just had a conversation with Gilbert Satterthwaite  MSc. DIC. FRAS.  
    (Hayes, Kent. England)  to ask him when it was last used, as he was the last 
    person to use it on a regular basis.
    
    He mentioned that this month is the 150th anniversary of the Washington 
    Conference when the Greenwich Meridian (Airey) was adopted by the 
    international community as the Prime Meridian.
    
    Here are a few interesting facts which might be of interest:-
    
    The Airey Transit instrument was first used on 4th Jan 1851  and provided 
    published observations annually up to 30 March 1954 i.e for a period of 103 
    years 3 months.
    
    The Sun; Moon; planets out to Neptune; and the four brightest minor planets, 
    Ceres, Pallas, Juno, and Vesta were included with the star catalogue.
    
    On the last day of observations,  30 March 1954,  Gilbert observed Jupiter, 
    Venus Juno and the last observation to be catalogued with the Airey 
    instrument was Pallas at about 21-00 in the evening.
    
    Gilbert has written a paper on the Airey instrument published with his paper 
    on Airey and Positional Astronomy, and another on Airey's zenith telescopes.
    
    He is the chairman of the Astronomical History and Heritage Group which 
    publishes a journal on Heritage astronomical instruments and related items of 
    interest.
    
    Douglas Denny.
    Chichester. England.
    
    
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