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sidereal day
(Encyclopedia) sidereal day: see sidereal time.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…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.Columbus Day
(Encyclopedia) Columbus Day, holiday commemorating Christopher Columbus's discovery of America. It has been traditionally celebrated on Oct. 12 throughout most of the United States, parts of Canada,…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'…Canada Day
(Encyclopedia) Canada Day, formerly Dominion Day, Canadian national holiday, celebrated July 1. It is the anniversary of the uniting in 1867 of Upper and Lower Canada, New Brunswick, and Nova Scotia…holiday
(Encyclopedia) holiday [altered from holy day], day set aside for the commemoration of an important event. Holidays are often accompanied by public ceremonies, such as parades and carnivals, and by…week
(Encyclopedia) week, period of time shorter than the month, commonly seven days. The ancient Egyptians used a 10-day period, as did the French under the short-lived French Revolutionary calendar. In…Earth Day by the Numbers
April 22, 2019, marks the 49th anniversary of Earth Day—a day intended to inspire awareness and appreciation for the Earth's natural environment. Organizers started Earth Day in response to a…Trending
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