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Regiomontanus

(Encyclopedia)Regiomontanus rēˌjēōmŏnˌtāˈnəs [key] [Lat.,=belonging to the royal mountain, i.e., to Königsberg], 1436–76, German astronomer and mathematician, b. Königsberg. His original name was Johan...

Harmodius and Aristogiton

(Encyclopedia)Harmodius and Aristogiton härmōˈdēəs, ârˌĭstōjīˈtən [key], d. c.514 b.c., Athenian tyrannicides. Provoked by a personal quarrel, the two friends planned to assassinate Hipparchus and his b...

Titan , in Greek religion and mythology

(Encyclopedia)Titan, in Greek religion and mythology, one of 12 primeval deities. The female Titan is also called Titaness. The Titans—six sons and six daughters—were the children of Uranus and Gaea. They were ...

Hermes, in Greek religion and mythology

(Encyclopedia)Hermes, in Greek religion and mythology, son of Zeus and Maia. His functions were many, but he was primarily the messenger of the gods, particularly of Zeus, and conductor of souls to Hades. He was go...

astrolabe

(Encyclopedia)astrolabe ăsˈtrəlāb [key], instrument probably used originally for measuring the altitudes of heavenly bodies and for determining their positions and movements. Although its origin is ancient and ...

Eratosthenes

(Encyclopedia)Eratosthenes ĕrətŏsˈthənēz [key], c.275–c.195 b.c., Greek scholar, b. Cyrene. A pupil of Callimachus in Athens, he became (c.240 b.c.) head of the library at Alexandria. Known for his versatil...

Longinus, fl. 1st cent.? a.d., Greek literary critic

(Encyclopedia)Longinus lŏnjīˈnəs [key], fl. 1st cent.? a.d., Greek literary critic; writer of the famous treatise On the Sublime. Nothing is known of his life, and for a long time his work was attributed to Cas...

Callimachus, fl. c.280–45 b.c., Hellenistic Greek poet and critic

(Encyclopedia)Callimachus, fl. c.280–45 b.c., Hellenistic Greek poet and critic, b. Cyrene. Educated at Athens, he taught before obtaining work in the Alexandrian library. There he drew up a catalog, with such co...

Thales

(Encyclopedia)Thales thāˈlēz [key], c.636–c.546 b.c., pre-Socratic Greek philosopher of Miletus and reputed founder of the Milesian school of philosophy. He is the first recorded Western philosopher. Thales ta...

Praesepe

(Encyclopedia)Praesepe prēsēˈpē [key] [Lat.,=manger], open star cluster in the constellation Cancer; cataloged as M44 or NGC 2632. It was first recorded by Hipparchus (c.150 b.c.). The cluster is often called t...