co-declinationn.

1661 J. Brown Descr. & Use Joynt-rule xix. 123 Make the lateral secant of the latitude, a parallel sine in the codeclination, then take the distance from the Suns Meridian altitude, to his present altitude.

1705 W. Jones New Epitomy Whole Art Pract. Navigation (ed. 2) xi. 75 Add the Complements of your Data together, and find the Difference between their half Sum and the Co-Declination.

1812 R. Woodhouse Elem. Treat. Astron. i. 8 Its co-declination, or, which is now the more usual term, its North polar distance.

1904 Bull. Amer. Geogr. Soc. 36 300 An astronomical triangle will be formed in which the known parts are respectively the co-latitude and co-declination.

2007 J. H. Karl Celestial Navigation GPS Age ii. 20 By varying this third parameter and keeping the co-declination and co-altitude constant, we can trace out the latitude and longitude coordinates.