1572
The remains of the star that Tycho saw, photographed in X-rays by NASA’s Chandra observatory.Image: Smithsonian Institution from United States · Public domainscience · Europe
Tycho Brahe sees a new star
On the evening of 11 November 1572 (Julian calendar) the young Danish astronomer Tycho Brahe noticed a brilliant star in the constellation Cassiopeia where none had been before. At its brightest it outshone Jupiter and could be seen in daylight. Others had spotted it a few days earlier, but Tycho measured it with great care. He found that it did not move against the other stars, so it could not be close to Earth, like a comet. The heavens beyond the Moon, thought to be unchanging, had changed. Tycho’s book De Nova Stella made his name, and astronomers now know that the star was a supernova, the explosion of a white dwarf.
Source: Encyclopaedia Britannica: Tycho’s Nova ↗
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