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zodiac

(Encyclopedia) CE5 Signs of the zodiac CEE zodiaczodiaczōˈdēăk [key] [Gr. zoion=animal], in astronomy, zone of the sky that includes about 8° on either side of the ecliptic. The apparent paths…

Callisto, in Greek mythology

(Encyclopedia) CallistoCallistokəlĭsˈtō [key], in Greek mythology, an attendant of Artemis. Because she forsook her chastity and bore a son, Arcas, to Zeus, she was transformed into a bear by Artemis…

Gemini

(Encyclopedia) GeminiGeminijĕmˈənī, –nē [key] [Lat.,=the twins], northern constellation lying on the ecliptic (the sun's apparent path through the heavens) between Taurus and Cancer, N of Canis Minor…

Lagoon Nebula

(Encyclopedia) Lagoon Nebula, bright, diffuse nebula in the southern constellation Sagittarius; cataloged as M8 or NGC 6526. It is visible to the naked eye and has an angular area larger than that of…

Praesepe

(Encyclopedia) PraesepePraesepeprēsēˈpē [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…

Albumazar

(Encyclopedia) AlbumazarAlbumazarälˌb&oomacr;mäˈzər [key], 805?–885, Arab astronomer, more fully Abu-Mashar Jafar ibn Muhammad. In his De magnis conjunctionibus he claimed that the world had been…

Horsehead Nebula

(Encyclopedia) Horsehead Nebula, dark nebula located in the constellation Orion; designated IC 434 or B 33. It consists of a cloud of nonluminous interstellar matter resembling the outline of a horse…

Aquila, in astronomy

(Encyclopedia) Aquila [Lat.,=the eagle], equatorial constellation located N of Sagittarius and Capricornus, lying partly in the Milky Way. It is sometimes depicted as an eagle. It contains the bright…

ecliptic coordinate system

(Encyclopedia) ecliptic coordinate system, an astronomical coordinate system in which the principal coordinate axis is the ecliptic, the apparent path of the sun through the heavens. The ecliptic…