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Polaris Corrections (a0, a1, a2) Corrections given at the back of the Nautical Almanac used to find latitude from Polaris, a technique that is similar to finding latitude from the sun at local apparent noon. The largest correction (a0) accounts for the position of Polaris on its circle about the pole, the other two account for the shape of the earth and slight motions of the polar axis and Polaris. See Polaris and Latitude by Polaris.

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