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    Re: Star-to-Star Distances and Stellarium
    From: Andrés Ruiz
    Date: 2014 Aug 24, 10:26 +0200
    Using my free software: 

    Imágenes integradas 1

    output:
    24/08/2014
    01:38:37 UT1
    Geocentric equatorial coordinates
    Vega
    GHA = 77.554537 º =  77º 33.3'
    Dec = 38.804477 º =  38º 48.3'
    Deneb
    GHA = 46.426383 º =  46º 25.6'
    Dec = 45.338146 º =  45º 20.3'

    Sextant Error by a Star-Star Distance

    Input data:
    Star 1: Dec = 38.804477 GHA = 77.554537
    Star 2: Dec = 45.338146 GHA = 46.426383
    Star-star distance - sextant: DSSs = 23.846667 =  23º 50.8'
    Position of the observer:
    B = 43.316667 =  43º 19.0'
    L = -2.000000 =  -2º  0.0'
    hEye = 1.830000
    Atmospheric parameters:
    P = 1010.000000
    T = 10.000000

    Calculated altitudes:
    Hc1 = 34.844499
    Z1 = 293.144546
    Hc2 = 58.559968
    Z2 = 289.383789
    Refraction:
    R1 = 0.023250
    R2 = 0.009900
    Apparent altitudes:
    Ha1 = 34.867749
    Ha2 = 58.569868

    Star-star distance: Calculated and Observed
    DSSc = 23.846449 =  23º 50.8'
    DSSo = 23.860022 =  23º 51.6'

    Sextant error = Index Error + Instrumental Error:
    Arc error = -0.013573º = -0.814375'

    best regards,

    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/

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