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Hershey, Alfred Day

(Encyclopedia)Hershey, Alfred Day, 1908–1997, American microbiologist, b. Owosso, Mich., Ph.D., Michigan State College (now Michigan State Univ.), 1934. Hershey was a professor at the Washington Univ. School of M...

Julian Day calendar

(Encyclopedia)Julian Day calendar, system of astronomical dating that allows the difference between two dates to be calculated more easily than conventional civil calendars with their uneven months. It was devised ...

April Fool's Day

(Encyclopedia)April Fool's Day or All Fool's Day, holiday of uncertain origin, known for practical joking and celebrated on the first of April. Prior to the adoption of the Gregorian calendar in 1564, the date was ...

John Day Dam

(Encyclopedia)John Day Dam, 219 ft (67 m) high and 5,640 ft (1,719 m) long, on the Columbia River between Oregon and Wash.; built between 1959 and 1968 by the U.S. Army Corps of Engineers. It is an extremely large ...

Atonement, Day of

(Encyclopedia)Atonement, Day of: see Yom Kippur. ...

New Year's Day

(Encyclopedia)New Year's Day, among ancient peoples the first day of the year frequently corresponded to the vernal or autumnal equinox, or to the summer or winter solstice. In the Middle Ages it was celebrated amo...

Lewis, Cecil Day

(Encyclopedia)Lewis, Cecil Day: see Day Lewis, Cecil. ...

Ben Day process

(Encyclopedia)Ben Day, or Benday, process: see printing. ...

Saint Valentine's Day

(Encyclopedia)Saint Valentine's Day, Western European Christian holiday, originally the Roman feast of Lupercalia. It was christianized in memory of the martyrdom of St. Valentine in a.d. 270, who, in medieval time...

Seventh-day Adventists

(Encyclopedia)Seventh-day Adventists: see Adventists. ...