425th anniversary: German astronomer Johannes Kepler began observations of an exceptionally bright...
History · Anniversaries · Wed, October 17, 2029
1604: German astronomer Johannes Kepler began observations of an exceptionally bright object, now known as Kepler's Supernova, that had appeared in the constellation Ophiuchus.
Source, method and history
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- Wikipedia
- How we know
- Wikipedia "On this day" selected anniversary, 425 years (1604 to 2029).
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- 2026-09-25: added to 2029-10-17