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When doing a sight reduction, it is a correction to the declination that accounts for its change during the minutes part of the sight time.

The same term is used for another correction done during the sight reduction to correct the tabulated value of the calculated height (Hc) for the minutes part of the declination. See Sight Reduction, Sight Reduction Tables, and d-Value.

Note that in using Pub 249 to find the d-correction to Hc it is best to interpolate the d-correction as explanined on page A9 of the Answers section of the Course Book. Search Student Locker for "d-correction" to find related discussion.

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