On this day in 1604 – German astronomer Johannes Kepler began observations of an exceptionally bright object, now known as Kepler's Supernova, which had suddenly appeared in the constellation Ophiuchus earlier in the month. 
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On this day in 1604 – German astronomer Johannes Kepler began observations of an exceptionally bright object, now known as Kepler's Supernova, which had suddenly appeared in the constellation Ophiuchus earlier in the month. 
