magnacycle

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Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Hemp (Cannabis sativa).

9 Mind-Altering Plants

The National Congress of Brazil in Brasilia City capital of Brazil. Brazilian National Congress designed by Oscar Niemeyer a Brazilian architect specializing in international modern architecture.

11 Iconic Buildings in Brazil

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

magnacycle

geology

Learn about this topic in these articles:

cyclothems

In cyclothem
…have been referred to as magnacycles. These larger units are of doubtful validity and restricted utility.
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