Template:Selected anniversaries/December 9: Difference between revisions

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||1830 – Heinrich Christian Friedrich Schumacher, Danish surgeon, botanist, and academic (b. 1757)
||1830 – Heinrich Christian Friedrich Schumacher, Danish surgeon, botanist, and academic (b. 1757)
||Karl Nikolaus Adalbert Krueger (b. 9 December 1832) was a German astronomer. Born in Marienburg, Prussia (now Malbork, Poland), he was editor of Astronomische Nachrichten from 1881 until his death.


File:LED Traffic Light.jpg|link=Traffic light (nonfiction)|1868: The first [[Traffic light (nonfiction)|traffic lights]] are installed, outside the Palace of Westminster in London. Resembling railway signals, they use semaphore arms and are illuminated at night by red and green gas lamps.
File:LED Traffic Light.jpg|link=Traffic light (nonfiction)|1868: The first [[Traffic light (nonfiction)|traffic lights]] are installed, outside the Palace of Westminster in London. Resembling railway signals, they use semaphore arms and are illuminated at night by red and green gas lamps.

Revision as of 08:04, 28 November 2017