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    Re: A navigation exercise
    From: Andrés Ruiz
    Date: 2010 Mar 29, 11:25 +0200

    This exercise serves me to introduce my new Lunar Distance program, available at my web site in April, (I shall notify this to NavList).

    • Time an position by lunars and latitude by double altitudes
    • Nautical Almanac for Lunar Distances
    • Fix by two Lunar Distances

     

     

    Lunar, supposing a near-near Lunar:

     

     

     

     

     

     

     

    24/03/2010

    10:00:00 UT1

    Geocentric equatorial coordinates

    Moon:

    GHA = 224.377133 º = 224º 22.6'

    Dec = 22.637093 º =  22º 38.2'

    Phase: 61% (+)

    Sun:

    GHA = 328.417981 º = 328º 25.1'

    Dec = 1.454475 º =   1º 27.3'

    Geocentric lunar distance

    LD = 102.361628 º = +102º 21' 41.9"

     

    DR:

    B = -6.280000 =  -6º 16.8'

    L = 72.080000 =  72º  4.8'

     

    IE = -0.800000 '

    air T = 34.4 ºC

    air P = 1007.0 hPa

    h Eye = 32.31 m

    Dip = 0.166733

     

    Time by lunar distances

    Moon:

    Hs = 23.977500 =  23º 58.6'

    Limb = -1

    SD = 16.114819 '

    HP = 59.141120 '

    R  = 0.033714 º

    OB = -0.000173 º

    PA = 0.901700 º

    AG = 0.001877 º

    SDag = 16.227459 '

    Sun:

    Hs = 44.838333 =  44º 50.3'

    Limb = 1

    SD = 16.042574 '

    HP = 0.147013 '

    R  = 0.015046 º

    OB = -0.000000 º

    PA = 0.001743 º

    AG = 0.000008 º

    SDag = 16.043057 '

    Lunar observation:

    LDs = 102.743333 = 102º 44.6'

    Moon Limb = 1

    body Limb = 1

    Clearing Lunar Distance:

    m = 23.526976  =  23º 31.6'

    M = 24.396839556840341  =  24º 23.8'

    s = 44.925651  =  44º 55.5'

    S = 44.912339334431678  =  44º 54.7'

    d = 103.267842  = 103º 16.1'

     

    T1 = 9.000000 LD1 = 101.818323

    Tc = 10.255502      LDo = 102.500775

    T2 = 11.000000      LD2 = 102.905461

     

    Error:

    Ta = 10:00:00 LDc = 102º 21.7'

    Tc = 10:15:20 LDo = 102º 30.0'

    Tc = 10:15:20 LDc = 102º 30.0'

    |LDo-LDc(Ta)| = 0.139147º = 8.348825'

    |LDo-LDc(Tc)| = 0.000247º = 0.014800'

    |Ta-Tc| = 15.330137 min = 919.808235 s

     

    Latitude by simultaneous double altitudes

    Bv = -7.091604 =  -7º  5.5'

     

    Longitude by time sight

    Lv = 72.116517 =  72º  7.0'

     

    Error in position:

    |Be-B| = 0.811604º = 48.696214'

    |Le-L| = 0.036517º = 2.191039'

     

     

     

     

     

    The latitude at LAN is: B = dec –(90º-Ho) for Z = N

     

     

    Latitud por altura meridiana

    Paso por el meridiano superior del lugar

    24/03/2010  07:18:00

    Sol

    Dec = 1.410186 =   1º 24.6'

    Hs = 81.578333 =  81º 34.7'

    Ho = 81.663766 =  81º 39.8'

    Culminacion = N

    B mediodia = -6.926048 =  -6º 55.6'

     

     

    The rough longitude at LAN (LHA=0) is:

     

     

    Longitud al mediodia

    24/03/2010  07:18:00

    GHA = 287.909495

    EoT = -6.361814

    L = 72.090454

    L = 72.090505 =  72º  5.4'

    Be = -6.926048

    LHA = 359.999949

    Z = 0.000354

    Hc = 81.663766

     

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