co-altitude--prophetes.ai

co-altitude

co-ˈaltitude Astron.
[f. co- 4 + altitude.]
The complement of the altitude.

1833 Herschel Astron. i. 62 The co-altitude of the pole. 1867–77 G. Chambers Astron. vii. vi. 699 The coaltitude is the mean of their N.P.D.'s [North Polar Distances].

Oxford English Dictionary