23 July
On 23 July every year, the Perseid meteor shower begins.The shower begins when Earth enters the edge of a cloud of debris from Comet Swift-Tuttle. Dust-sized particles hit the atmosphere ...
27 FÉVR. 2004
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1853: On 24 July 1853, Henri-Alexandre Deslandres was born.
Deslandres was a French astrophysicist who invented a spectroheliograph to photograph the Sun in monochromatic light and made extensive studies of the solar chromosphere and solar activity.
His investigation of molecular spectra produced empirical laws anticipating those of quantum mechanics. He observed spectra of planets and stars and measured their radial velocities, and he determined the rotation rates of Uranus, Jupiter and Saturn.
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22 July
1994: On 22 July 1994, the last of the large fragments of Comet P/Shoemaker-Levy (fragment W) hit Jupiter.Starting on 16 July 1994, Comet P/Shoemaker-Levy's impact with Jupiter was the first ...
21 July
1620: On 21 July 1620, Jean Picard was born.Picard is regarded as the founder of modern astronomy in France. He introduced new methods, improved the old instruments and added new ...
20 July
1969: On 20 July 1969, US astronaut Neil A. Armstrong became the first human to set foot on the Moon.As Commander of the Apollo 11 mission, he stepped from the ...
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