May 15
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1618 – Johannes Kepler confirms his previously rejected discovery of the third law of planetary motion.
1836 – Francis Baily observes and coins "Baily's beads" (also known as the "diamond ring effect") during an annular eclipse.
1958 – The Soviet Union launches Sputnik 3.
1960 – The Soviet Union launches Sputnik 4.
1963 – The launch of the final Mercury mission, Mercury-Atlas 9.
