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color

(Encyclopedia)color, effect produced on the eye and its associated nerves by light waves of different wavelength or frequency. Light transmitted from an object to the eye stimulates the different color cones of the...

Chinese Dynasties (table)

(Encyclopedia)Chinese Dynasties

clock

(Encyclopedia)CE5 A pendulum clock: Weight-driven clock mechanism clock, instrument for measuring and indicating time. Predecessors of the clock were the sundial, the hourglass, and the clepsydra. See also watc...

Maya, indigenous people of Mexico and Central America

(Encyclopedia)Maya mīˈə, Span. mäˈyä [key], indigenous people of S Mexico and Central America, occupying an area comprising the Yucatán peninsula and much of the present state of Chiapas in Mexico, Guatemala...

Caesar, Julius

(Encyclopedia)Caesar, Julius (Caius Julius Caesar), 100? b.c.–44 b.c., Roman statesman and general. Caesar has always been one of the most controversial characters of history. His admirers have seen in him the ...

astronomy

(Encyclopedia)astronomy, branch of science that studies the motions and natures of celestial bodies, such as planets, stars, and galaxies; more generally, the study of matter and energy in the universe at large. ...

Muhammad, prophet of Islam

(Encyclopedia)Muhammad məhămˈəd [key] [Arab.,=praised], 570?–632, the name of the Prophet of Islam, one of the great figures of history, b. Mecca. The traditions concerning Muhammad's life, deeds, and sa...

observatory

(Encyclopedia)observatory, scientific facility especially equipped to detect and record naturally occurring scientific phenomena. Although geological and meteorological observatories exist, the term is generally ap...

Roman religion

(Encyclopedia)Roman religion, the religious beliefs and practices of the people of ancient Rome. The spirits were held in awe and were placated with offerings and prayers. In the earliest period of Roman state r...

Paul, Saint

(Encyclopedia)Paul, Saint, d. a.d. 64? or 67?, the apostle to the Gentiles, b. Tarsus, Asia Minor. He was a Jew. His father was a Roman citizen, probably of some means, and Paul was a tentmaker by trade. His Jewish...