Template:Selected anniversaries/May 15

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  • 1618: Johannes Kepler confirms his previously rejected discovery of the third law of planetary motion (he first discovered it on March 8 but soon rejected the idea after some initial calculations were made).

    1618: Johannes Kepler confirms his previously rejected discovery of the third law of planetary motion (he first discovered it on March 8 but soon rejected the idea after some initial calculations were made).

  • 1801: Mathematician Joseph Ludwig Raabe born. He will discover Raabe's ratio test, which determines the convergence or divergence of an infinite series, in some cases.

    1801: Mathematician Joseph Ludwig Raabe born. He will discover Raabe's ratio test, which determines the convergence or divergence of an infinite series, in some cases.

  • 1836: Astronomer Francis Baily observes "Baily's beads" during an annular eclipse.

    1836: Astronomer Francis Baily observes "Baily's beads" during an annular eclipse.

  • 1864: Asclepius Myrmidon Prepares for Emergency Field Surgery incorporated into army medical manuals on both sides of the American Civil War.

    1864: Asclepius Myrmidon Prepares for Emergency Field Surgery incorporated into army medical manuals on both sides of the American Civil War.

  • 1973: Cryptologist Laurance Safford born. Safford established the Naval cryptologic organization after World War I, and headed the effort more or less constantly until shortly after the Japanese attack on Pearl Harbor.

    1973: Cryptologist Laurance Safford born. Safford established the Naval cryptologic organization after World War I, and headed the effort more or less constantly until shortly after the Japanese attack on Pearl Harbor.

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