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Coudé focus

(Encyclopedia)Coudé focus: see telescope.

equatorial mounting

(Encyclopedia)equatorial mounting: see telescope. ...

Newtonian focus

(Encyclopedia)Newtonian focus: see telescope.

Cassegrain focus

(Encyclopedia)Cassegrain focus: see telescope. ...

resolving power

(Encyclopedia)resolving power: see telescope.

Pulkovo

(Encyclopedia)Pulkovo po͞olˈkəvə [key], astronomical observatory, S of St. Petersburg, NW Russia. Pulkovo was built (1834–39) under a commission headed by F. G. W. von Struve. In 1839 its 15-in. (38-cm) refra...

transit instrument

(Encyclopedia)transit instrument or transit, telescope devised to observe stars as they cross the meridian and used for determining time. Its viewing tube swings on a rigid horizontal axis restricting its movements...

Palomar Mountain

(Encyclopedia)Palomar Mountain pălˈōmär [key], peak, 6,126 ft (1,867 m) high, S Calif., NE of San Diego, in Cleveland National Forest. It is the site of the Palomar Observatory, operated by the California Insti...

planetary system

(Encyclopedia)planetary system, a star and all the celestial bodies bound to it by gravity, especially planets and their natural satellites. Until the last decade of the 20th cent., the only planetary system known ...

sextant

(Encyclopedia)CE5 Sextant sextant, instrument for measuring the altitude of the sun or another celestial body; such measurements can then be used to determine the observer's geographical position or for other n...