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Aristarchus of Samos

(Encyclopedia) Aristarchus of SamosAristarchus of Samosărˌĭstärˈkəs, [key]Aristarchus of Samosărˌĭstärˈkəs, sāˈmŏs [key], fl. c.310 b.c.–c.230 b.c., Greek astronomer and mathematician of the…

center of mass

(Encyclopedia) center of mass, the point at which all the mass of a body may be considered to be concentrated in analyzing its motion. The center of mass of a sphere of uniform density coincides with…

Date of Easter

The Question: Why does Easter occur at different times each year? The Answer: Easter, for Western churches, is calculated as the first Sunday…

Tromp, Maarten Harpertszoon

(Encyclopedia) Tromp, Maarten HarpertszoonTromp, Maarten Harpertszoonmärˈtən härˈpərtsōn [key]Tromp, Maarten Harpertszoon trômp [key], 1597–1653, Dutch admiral. A sailor from childhood, he joined the…

DK Space: Neptune

WHAT IS NEPTUNE MADE OF? TRITONFIND OUT MORENeptune is 30 times farther from the Sun than Earth, and has the most powerful hurricanes of any planet in the Solar System. It is a gas giant with faint…

Endymion

(Encyclopedia) EndymionEndymionĕndĭmˈēən [key], in Greek mythology, young shepherd, loved by Selene (the moon). In one version of his legend, he asked Zeus for immortality and perpetual youth. Zeus…

Sin, in ancient Middle Eastern religions

(Encyclopedia) SinSinsĭn [key], moon god of Semitic origin, worshiped in ancient Middle Eastern religions. One of the principal deities in the Babylonian and Assyrian pantheons, he was lord of the…

Li Po Biography

Li BoChinese poetBorn: c. 700 Li Po is considered the greatest poet of the Tang Dynasty, China’s “middle period,” during which literature flourished. His poetry is often associated with the moon…