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February 23, 2011 / jmeuropeana

earthquake, Heisenberg, supernova

On the 23rd of February –

Our thoughts go out to the victims of the earthquake in Christchurh, New Zealand. The beautiful and friendly city was hit twice in short succession.
On the 23rd of February in 1887 the French Riviera is hit by a large aerthquake, killing 2.000 people and leaving many homeless:

In 1927 Werner Heisenberg formulates his uncertainty principle for the first time – or did he?
Bildnis Werner Heisenberg (1901 - 1976)
Most people know this uncertainty principle from the paradox of Schödinger’s Cat, which gives me an excellent reason to show some cats on this blog – as if I needed a reason.
Un chat écrivant au pinceau la date 1831
Frise avec deux chats noirs et deux chats blancs
Chat noir couché en boule sur un divan

Supernova 1987a is spotted in Cassiopeia, in 1987 of course. Here is an earlier one, discovered by Tych Brahe. Imagine his surprise to suddenly find a new star:
[Illustration de Astronomiae instauratae progymnasmata... Uraniburgi Daniae, absoluta] / [Non identifié] ; Tycho Brahe, aut. de texte

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