Template:Selected anniversaries/October 13: Difference between revisions
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File:Geminiano Montanari.jpg|link=Geminiano Montanari (nonfiction)|1687: Astronomer, lens-maker, and academic [[Geminiano Montanari (nonfiction)|Geminiano Montanari]] dies. He made the observation that Algol in the constellation of Perseus varies in brightness. | File:Geminiano Montanari.jpg|link=Geminiano Montanari (nonfiction)|1687: Astronomer, lens-maker, and academic [[Geminiano Montanari (nonfiction)|Geminiano Montanari]] dies. He made the observation that Algol in the constellation of Perseus varies in brightness. | ||
||1773 | File:Charles Messier.jpg|link=Charles Messier (nonfiction)|1773: The Whirlpool Galaxy is discovered by [[Charles Messier (nonfiction)|Charles Messier]]. | ||
||1820 – John William Dawson, Canadian geologist and academic (d. 1899) | ||1820 – John William Dawson, Canadian geologist and academic (d. 1899) | ||
Revision as of 16:56, 9 August 2017
1687: Astronomer, lens-maker, and academic Geminiano Montanari dies. He made the observation that Algol in the constellation of Perseus varies in brightness.
1773: The Whirlpool Galaxy is discovered by Charles Messier.
1990: Lorenz system develops self-awareness, experiences irrational fear of the number thirteen.