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    Re: ex-meridian sights
    From: Steven Wepster
    Date: 2001 Feb 12, 8:13 AM

    Your quote doesn't say that Table 24 gives the change per minute; it
    says that it gives the change _in one minute from the meridian_ . The
    change in altitude is not linear so that's why Table 25 was not
    calculated using Correction = a X t/60. Apparently a second-order
    extrapolation (ie, a formula involving the square of t) is considered
    sufficient (I didn't look int that in detail). It is quite natural
    that the correction formula does not contain a first order term (a
    factor times t) because that would spoil the symmetrical change in
    altitude before and after transit.
    
    Regards, _Steven Wepster.
    

       
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