On the Heavens

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VAN, TURKEY - OCTOBER 25: A building and car ruined during the earthquake of Van-Ercis on October 25, 2011 in Van, Turkey. It is 604 killed and 4152 injured in Van-Ercis Earthquake.

What Is an Aftershock?

solar eclipse, sun, moon, astronomy, space

How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?

Still from the film Deliverance, 1919. The story of Helen Keller and Anne Sullivan. View shows Keller in the cockpit/front seat of an airplane.

How Did Helen Keller Fly a Plane?

Black widow spider

9 of the World’s Deadliest Spiders

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

Vietnam War. U.S. President Lyndon B. Johnson awards the Distinguished Service Cross to First Lieutenant Marty A. Hammer, during a visit to military personnel, Cam Ranh Bay, South Vietnam, October 26, 1966. President Johnson

Vietnam War Timeline

Adolf Hitler (Nazi, nazism, German leader).

9 Things You Might Not Know About Adolf Hitler

On the Heavens

work by Aristotle

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discussed in biography

In Aristotle: Physics and metaphysics of Aristotle
…On Generation and Corruption and On the Heavens, he presented a world-picture that included many features inherited from his pre-Socratic predecessors. From Empedocles (c. 490–430 bce) he adopted the view that the universe is ultimately composed of different combinations of the four fundamental elements of earth, water, air, and fire.…
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history of astronomy

In astronomy: Applying geometry
…support the claim is Aristotle’s On the Heavens (c. 350 bce), but this knowledge likely went back several generations earlier. Aristotle mentioned that Earth’s shadow as seen on the Moon during a lunar eclipse is circular. He also mentioned the changes that occur in the stars that are visible as…
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