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′ 52″ 8; and hence PR the co-latitude will be 38° 53′ 7″. 2.
1878. Lockyer, Stargazing, 329, note. The altitude of the star in this case is its declination plus the co-latitude of the place.
