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prime meridian

(Encyclopedia)prime meridian, meridian that is designated zero degree (0°) longitude, from which all other longitudes are measured. By international convention, it passes through the site of the Royal Observatory ...

Greenwich meridian

(Encyclopedia)Greenwich meridian: see prime meridian. ...

Meridian

(Encyclopedia)Meridian mərĭdˈēən [key], city (1990 pop. 41,036), seat of Lauderdale co., E Miss., near the Ala. line; settled 1831, inc. 1860. It is an important rail and highway point and the trade and shippi...

meridian circle

(Encyclopedia)meridian circle: see transit instrument. ...

celestial meridian

(Encyclopedia)celestial meridian, vertical circle passing through the north celestial pole and an observer's zenith. It is an axis in the altazimuth coordinate system. ...

meridian of longitude

(Encyclopedia)meridian of longitude: see longitude. ...

prime minister

(Encyclopedia)prime minister or premier, chief member of the cabinet in a parliamentary system of government. The prime minister is head of the government, in contrast with the head of state, who may be a constitut...

prime number

(Encyclopedia)prime number: see number theory. ...

prime mover

(Encyclopedia)prime mover: see energy, sources of. ...

Prime, Samuel Irenaeus

(Encyclopedia)Prime, Samuel Irenaeus, 1812–85, American Presbyterian clergyman and editor, b. Ballston Spa, N.Y. After holding pastorates at Ballston Spa and Matteawan, N.Y., he became assistant editor (1840–49...