It was a good many years ago that I wrote this one. - - Dan Fitz.

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The North Star or Polaris is not exactly at the pivot point, but was one degree from it (1966) and in the seventeenth century was slightly over two degrees from the same point.

This error was almost entirely eliminated by taking the readings of the North Star when certain constellations were directly above or below the star, and then respectively adding or subtracting the two degrees from the observed angle measurement.