15 fev 1564 ano - Galileo Galilei's birthday
Descrição:
Galileo discovered four of Jupiter’s moons: Europa, Ganymede, Callisto, and Io. He also discovered that Venus has phases. This helped people understand that, if moons can orbit a planet, then a planet can orbit a sun. Plus, Venus wouldn't have phases if it were orbiting Earth, as sunlight wouldn't be able to reach Venus.
(He also discovered Saturn's rings, but that's not very significant.)
Adicionado na linha do tempo:
Astronomer Timeline
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