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    Re: Longhand Sight Reduction
    From: Greg Rudzinski
    Date: 2014 Nov 8, 18:25 -0800

    Francis,

    Here is an example from this afternoon for you.

    L= Latitude

    d= Declination

    LHA= Local Hour Angle or Meridian Angle

    P= Product

    hv= Haversine

    hv(-1)= Arc Haversine

    ZD= Zenith Distance

    Hc= Calculated Altitude= (90°-ZD)

     

    Reduction sequence for latitude and declination contrary in name:

    Column A: hv(L+d) + hv(L-d)= sum.   (1-sum) x hv(LHA)= P

    Column B: hv(L+d) + P = sum.   Arc hv(sum)= ZD.   90°-ZD= Hc

     

    Greg Rudzinski



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