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Today is Christiaan Huygens' Birthday!
Happy Birthday
Huygens!

Born:  April 14, 1629
in The Hague, Netherlands

Died:  July 8, 1695
in The Hague, Netherlands

Physicists and mathematicians applaud Huygens' work on the pendulum.  He recognized its path to be that of the much studied cycloid.  For this reason, the cycloid is sometimes called the tautochrone.

Huygens also investigate refraction of light in crystals.  This was to become an enormous field in chemistry.

Though brief, his De Ratiociniis in Aleae Ludo or On the Calculations in Games of Chance (1657) is considered the first text written on probability.

from Huygen's "Horologium oscillatorium,"  (1673) . . .
Huygen's Pendulum Clock
Courtesy of the Huntington Library, San Marino, CA.