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What time did Galileo Galilei discover Jupiters four largest satellites?

April 26, 2017discover galileo galilei Jupiter largest satellites time

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What time did Galileo Galilei discover Jupiters four largest satellites?

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in March 1610, in which he details his observations of the four large Jovian moons. Therefore the observations he made would have occurred some time earlier in 1610, or perhaps late in 1609. My best guess is that his discovery occurred some time between 8:00 pm and 11:00 pm in the evening.