15th MAY ~ HiSTORY ON THiS DAY

1600s / 17th century history on the 15th of May

1618 : Johannes Kepler confirmed his discovery of the third law of planetary motion, which he first discovered 2 months earlier on the 8th of March but originally rejected the idea.

Kepler’s Third Law of Motion – Astronomy (Socratica YouTube channel video)
1800s / 19th century history on the 15th of May

1817 : The 1st private mental health hospital was opened in the United States, in Philadelphia, Pennsylvania. The Asylum for the Relief of Persons Deprived of the Use of Their Reason is now known as the Friends Hospital.

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