Galileo has observed Jupiter's moons for two weeks

400 years ago tonight marks the first two weeks of Galileo's observations of Jupiter's four moons. By now he has seen the moons play hide and seek many times -- going into and emerging from eclipse by the giant planet Jupiter. He is absolutely convinced that the moons are part of Jupiter's system. However, in his observing notes he is not yet speculating about what his observations indicate. He's demonstrating great restraint. His notes show excellent observation of the application of the scientific method: observe, acquire data of the highest quality, write it all down

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