a. Astr. [CIRCUM- 2.] Situated about or near the meridian; applied to observations of a heavenly body when near the meridian. Also (badly) Circum-meridional a.
1852. Th. Ross, trans. Humboldt’s Trav., Introd. 14. Circum-meridian altitudes of the moon.
1876. Davis, Polaris Exp., vi. 168. Circum-meridian observations of Jupiter were made.
1875. Bedford, Sailor’s Pock. Bk., v. (ed. 2), 194. To obtain latitudes from sun and stars, *circum-meridional altitudes are generally used.
