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    Re: Aligning a transit telescope to the meridian
    From: Geoffrey Kolbe
    Date: 2008 Apr 22, 07:26 +0100

    Hello Bill
    
    Thanks for your suggestion.
    
    I guess the site could be surveyed first, using a transit theodolite, which
    has an accurately calibrated horizontal circle, standing precisely where
    the telescope is going to sit. Once an azimuth of 180 degrees is
    determined, I could send my coachman to walk out in a Southerly direction
    with a marker and plant it a mile or so away directly on the meridian
    azimuth. Getting him in exactly the right place at that distance would be a
    bit of a problem, but if I strung my gardeners out in a line, I could pass
    messages down the line to go left a bit or right a bit. ;-)
    
    I have a small wood to the South East which would tend to block my view of
    bodies rising in that quarter, but my forester will make short work of that.
    
    The telescope could then be set in its mounts, levelled off and aligned to
    point at the distant marker.
    
    Thanks again,
    
    Geoffrey Kolbe
    
    At 23:34 21/04/2008, you wrote:
    >
    >
    >Measure the azimuth of a bright near-equatorial star at, say, 15
    >degrees altitude in the east, and again 15 degrees altitude in the
    >west.  (Mark these out on the ground, using local landmarks, not with
    >a compass.)  Split the difference to get a north-south line.  You
    >might have to do the two measurements at different times of the year.
    >
    >Do the same with the sun, around a solstice, or else applying some
    >correction for its changing declination.
    
    
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