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    Default Important Astronomical anniversary today

    Here is a notice I received from my local club reminding of an important astronomical anniversary on this date:

    March 12, 1610: Day Galileo revealed all his secrets

    March 12, 1610, marks the date that Galileo Galilei published his famous book, The Starry Messenger, in which he recounted the discoveries he'd made with his newly built telescope. (He hadn't built the first one, but he did significantly improve on the original.)

    Among the book's most notable revelations: The discovery of Jupiter's four largest satellites, which provided evidence that not all objects in the heavens orbited the Earth. Because of this, Galileo's book later proved to be one of Newton's best friends.

    Galileo's data allowed Newton to confirm that Kepler's laws of planetary motion also applied to the moons orbiting Jupiter, thus demonstrating that the force that produced these orbits was the same force that kept the planets orbiting the Sun and the Moon orbiting the Earth. In other words, it put Newton's Universal Law of Gravity on firm empirical footing.
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