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co-latitude

co-ˈlatitude Astron.
  [see co- 4.]
  The complement of the latitude, i.e. the difference between it and 90 degrees.

1790 Roy Trigon. Operation in Phil. Trans. LXXX. 208 Its latitude will be 51° 6{p} 52{pp} 8; and hence PR the co-latitude will be 38° 53{p} 7{pp}.2. 1878 Lockyer Stargazing 329 The altitude of the star in this case is its declination plus the co-latitude of the place.

Oxford English Dictionary

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