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Mercury, in astronomy

(Encyclopedia)Mercury, in astronomy, nearest planet to the sun, at a mean distance of 36 million mi (58 million km); its period of revolution is 88 days. Mercury passes through phases similar to those of the moon a...

Nike

(Encyclopedia)Nike nīˈkē [key], in Greek religion and mythology, goddess of victory, daughter of Pallas and Styx. Often an attendant of Zeus or Athena, she also presided over all contests, athletic as well as mi...

abacus, in architecture

(Encyclopedia)abacus ăbˈəkəs [key], in architecture, flat slab forming the top member of a capital. In classical orders it varies from a square form having unmolded sides in the Greek Doric, to thinner proporti...

Mass, in Christianity

(Encyclopedia)Mass, religious service of the Roman Catholic Church, which has as its central act the performance of the sacrament of the Eucharist. It is based on the ancient Latin liturgy of the city of Rome, now ...

Chaos

(Encyclopedia)Chaos kāˈōs [key], in Greek religion and mythology, vacant, unfathomable space. From it arose all things, earthly and divine. There are various legends explaining it. In one version, Eurynome rose ...

Uranus , in astronomy

(Encyclopedia)Uranus yo͝orāˈnəs, yo͝orˈə– [key], in astronomy, 7th planet from the sun, at a mean distance of 1.78 billion mi (2.87 billion km), with an orbit lying between those of Saturn and Neptune; its...

Cinna, d. 44 b.c., Roman tribune

(Encyclopedia)Cinna (Caius Helvius Cinna), d. 44 b.c., Roman tribune. At the funeral of Julius Caesar the mob mistook him for Lucius Cornelius Cinna and killed him. He was probably the minor poet Cinna, a friend of...

aerial and satellite photography

(Encyclopedia)aerial and satellite photography, technology and science of taking still or moving-picture photographs from a camera mounted on a balloon, airplane, satellite, rocket, or spacecraft. In the 19th cent....

Gaea

(Encyclopedia)Gaea jēˈə [key], in Greek religion and mythology, the earth, daughter of Chaos, both mother and wife of Uranus (the sky) and Pontus (the sea). Among Gaea's offspring by Uranus were the Cyclopes, th...

Muses

(Encyclopedia)Muses, in Greek religion and mythology, patron goddesses of the arts, daughters of Zeus and Mnemosyne. Originally only three, they were later considered as nine. Calliope was the Muse of epic poetry a...