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Michael I, Byzantine emperor

(Encyclopedia)Michael I (Michael Rangabe), d. c.845, Byzantine emperor (811–13), son-in-law of Nicephorus I. He supported orthodoxy against iconoclasm and recalled Theodore of Studium from exile. He recognized (8...

Medici, Piero de', 1471–1503, Italian merchant prince

(Encyclopedia)Medici, Piero de', 1471–1503, Italian merchant prince. He succeeded his father, Lorenzo de' Medici (Lorenzo il Magnifico), as head of the Medici family and as leader of the Florentine state. In 1494...

Al-Battani

(Encyclopedia)Al-Battani ălˌbətēˈnēəs [key], b. before 858, d. 929, Arab astronomer and mathematician. He is best known in astronomy for his improvements and corrections of the Ptolemaic tradition. His Kitab...

occultation

(Encyclopedia)occultation ŏkˌəltāˈshən [key], in astronomy, eclipse of one celestial body by another, e.g., when the moon lies between a star and the earth. Occultations of stars by the moon are important in ...

Schism of East and West

(Encyclopedia)Schism of East and West, division between the Orthodox Eastern Church and the Roman Catholic Church. See Christianity; Ferrara-Florence, Council of; Leo IX, Saint; Lyons, Second Council of; papacy; Ph...

astrophysics

(Encyclopedia)astrophysics, application of the theories and methods of physics to the study of stellar structure, stellar evolution, the origin of the solar system, and related problems of cosmology. The distinctio...

Flammarion, Camille

(Encyclopedia)Flammarion, Camille kämēˈyə flämäryôNˈ [key], 1842–1925, French astronomer and author. He served for some years at the Paris Observatory and the Bureau of Longitudes, and in 1883 he set up a...

granule

(Encyclopedia)granule, in astronomy: see photosphere. ...

eccentricity

(Encyclopedia)eccentricity, in astronomy: see orbit. ...

filament

(Encyclopedia)filament, in astronomy: see chromosphere. ...