north·ing /ˈnɔrθɪŋ, ðɪŋ/
  北距,北進,北航
  North·ing, n.
  1. Surv. & Navigation Distance northward from any point of departure or of reckoning, measured on a meridian; -- opposed to southing.
  2. Astron. The distance of any heavenly body from the equator northward; north declination.
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