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Earth Day
(Encyclopedia)Earth Day, Apr. 22, a day to celebrate the environment. The first Earth Day was organized in 1970 to promote the ideas of ecology, encourage respect for life on earth, and highlight growing concern ov...Lady Day
(Encyclopedia)Lady Day or Annunciation: see Mary. ...Judgment Day
(Encyclopedia)Judgment Day or Doomsday, central point of early Christian, Jewish, and Islamic eschatology, sometimes called the Day of the Lord. References to it throughout the Bible are numerous. The Christian bel...John Day
(Encyclopedia)John Day, river, 281 mi (452 km) long, rising in several branches in the Strawberry Mts., NE Oreg., and flowing W, then N to the Columbia River. Unnavigable, the river is used to irrigate vegetable fa...Armistice Day
(Encyclopedia)Armistice Day: see Veterans' Day.Flag Day
(Encyclopedia)Flag Day, anniversary of the adoption of the American flag in 1777. It is celebrated on June 14 but is not a legal holiday.Valentine's Day
(Encyclopedia)Valentine's Day: see Saint Valentine's Day. ...Veterans' Day
(Encyclopedia)Veterans' Day, holiday formerly observed in the United States as Armistice Day in commemoration of the signing of the Armistice ending World War I. Nov. 11 officially became Veterans' Day on May 24, 1...Thanksgiving Day
(Encyclopedia)Thanksgiving Day, national holiday in the United States commemorating the Pilgrims' celebration of the harvest reaped by the Plymouth Colony in 1621, after a winter of great starvation and privation. ...sidereal day
(Encyclopedia)sidereal day: see sidereal time. ...Browse by Subject
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