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    Re: Navy MK 5 Octant Using Natural Horizon
    From: Greg Rudzinski
    Date: 2012 May 1, 11:38 -0700

    Alex,

    Here is a sample of ten observations using the preset method. By presetting I am on an exact moa of the micrometer drum so the measurement precision will be about 0.2' moa . When I don't preset then I am doing a visual interpolation which is at best within 0.5' moa. For the data (Hs) is the actual altitude reading taken from the octant micrometer drum.

    I.C. = +6.0' moa (add to each Hs value)
    H.E. = 8.5 ft.
    Sun at lower limb
    Assumed Latitude 34* 10.2' N
    Assumed Longitude 119* 14.0' W

    Date 4/29/2012 UT

    UT 21:21:39 Hs 62* 2' intercept 0.5' away
    21:23:32 Hs 61* 44' intercept 0.3' away
    21:24:58 Hs 61* 30' intercept 0.3' away
    21:26:15 Hs 61* 18' intercept 0.3' toward
    21:27:36 Hs 61* 4' intercept 0.3' away
    21:28:49 Hs 60* 52' intercept 0.2' away
    21:30:58 Hs 60* 30' intercept 0.7' away
    21:34:08 Hs 59* 58' intercept 0.5' away
    21:35:47 Hs 59* 42' intercept 0.4' toward
    21:37:08 Hs 59* 28' intercept 0.3' toward

    Sight reductions were performed by Pilot Navigator Software Version 6.9

    Greg Rudzinski

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