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    A distinction between constant and systematic error
    From: Peter Fogg
    Date: 2007 Apr 25, 18:29 +1000

    During recent postings on this topic I failed to make a distinction
    between constant and systematic error.
    Some error is constant. Error in time is an example, as could be a
    consistent error in measuring or recording altitude.
    Other error can be systematic although its effect is not constant. An
    error in applying a measurement of temperature or air-pressure is an
    example of error that is systematic although the effect on calculated
    refraction will vary, according to altitude.
    Similarly, if the pivotal point of the sextant arm is not exactly
    central this will generate error according to the sine of the angle of
    rotation - again; it is systematic although not constant.
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