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Chichen Itza, a Mayan proto-observatory was constructed in mid-eastern Mexico at this point. Its' use as a proto-observatory is mostly speculational, as documentary evidence of its existence was not around at that point.
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Copernicus created his model on this date
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Tycho Brahe observed a supernova in this year.
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That's what happened today.
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On the 19th of March, 1906, astronomers projected the first known pictures of Pluto ever to be taken
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On the 12 of April, 1961, Russian Yuri Gagarin became the first man in space, as well as the first man to complete a full orbit of the Earth.
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Apollo 11 sets down on the moon. A day later, Neil Armstrong became the first man to set foot on the moon.
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The Soviet Lunokhod 1 unmanned rover touched down on the surface of the moon on this date, becoming the first one ever on the surface.
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On this day, Pluto was officially no longer considered a planet by common astronomy.
