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1 gen 1922 anni - Annie Jump Cannon [May 9th, 1922] Annie Jump Cannon’s Classification System is inherited by the International Astronomical Union. This system is formally used in today’s society with a few minor changes.
Aggiunto al nastro di tempo:
14 nov 2017
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Timeline
Data:
1 gen 1922 anni
Adesso
~ 102 years ago