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Does moonlight ever produce rainbows?

June 8, 2017 | Author: | Posted in Geography

Rainbows by moonlight, known as moonbows, are unusual but not rare phenomena. Aristotle referred to lunar bows about twenty-two hundred years ago, and they are well known to scientists, although they are not often observed, chiefly because of the faintness of the light at night. Only under exceptional conditions can the colors of a moonbow be seen. Lunar rainbows …

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Who discovered that the earth is a sphere?

February 27, 2017 | Author: | Posted in Geography

That the earth is a sphere was one of the discoveries made by Pythag­oras, a Greek philosopher who lived in the sixth century B.C. The researches of Anaximander had prepared the way for the discovery, and the doctrine of the spherical form of the earth was taught by Parmeni­dies, who was associated with the Pythagoreans. …