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    Sextant certificate with a graph
    From: Frank Reed
    Date: 2020 Aug 16, 08:55 -0700

    Saw this interesting sextant certificate today. I have not seen a graph for arc errors before. Notice that the values were probably measured every 15° since they then fall right on the graph's primary lines, ignoring some drawing "bumps", in the entire range from 0° to 120° except at 105°. The graphic visually implies what most of us imagine to be true anyway: that we can interpolate linearly between values in a certification table. Is that true? Hard to say. I should add that the value at 0° usually has no significance and should always be zero since index error is separate from arc error.

    Frank Reed

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