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Copernican system

(Encyclopedia)Copernican system, first modern European theory of planetary motion that was heliocentric, i.e., that placed the sun motionless at the center of the solar system with all the planets, including the ea...

Copán

(Encyclopedia)Copán kōpänˈ [key], ruined city of the Maya, W Honduras, in a small river valley of the same name. Copán is noted for its fine sculptured stele and majestic architecture. The ruins were the site ...

europium

(Encyclopedia)europium yo͝orōˈpēəm [key] [from Europe], metallic chemical element; symbol Eu; at. no. 63; at. wt. 151.964; m.p. about 820℃; b.p. about 1,600℃; sp. gr. 5.25 at 25℃; valence +2 or +3. Europ...

international date line

(Encyclopedia)international date line, imaginary line on the earth's surface, generally following the 180° meridian of longitude, where, by international agreement, travelers change dates. Traveling eastward acros...

Hyades, in astronomy

(Encyclopedia)Hyades hīˈədēz [key], in astronomy, open star cluster in the constellation Taurus, located immediately to the right of the bright star Aldebaran. The cluster is about 130 light-years from the eart...

Hidatsa

(Encyclopedia)Hidatsa hēdätˈsä [key], Native North Americans, also known as the Minitari and the Gros Ventre. Their language belongs to the Siouan branch of the Hokan-Siouan linguistic stock (see Native America...

Gemini

(Encyclopedia)Gemini jĕmˈənī, –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; it is one of...

Joshua, book of the Bible

(Encyclopedia)Joshua jŏshˈo͞oə [key], book of the Bible. It is the first book of the Deuteronomic history (Joshua–2 Kings), in which the theological outlook of the Book of Deuteronomy is used to explain the f...

Multan

(Encyclopedia)Multan mo͝oltänˈ [key], city (1998 pop. 1,182,441), E central Pakistan, in the Punjab, near the Chenab River. It is an important road and rail junction, an agricultural center, and a market for tex...

N. Scott Momaday

(Encyclopedia)N. Scott Momaday (Navarre Scott Momaday), 1934–2024, American writer whose works are reflective of his Kiowa culture, b. Lawton, Okla., B.A. Univ. of ...