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From The Collaborative International Dictionary of English v.0.48:
Northing \North"ing\, n. 1. (Surv. & Navigation) Distance northward from any point of departure or of reckoning, measured on a meridian; -- opposed to southing. [1913 Webster] 2. (Astron.) The distance of any heavenly body from the equator northward; north declination. [1913 Webster]