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Christiaan Huygens (14 April 1629 – 8 July 1695) was a prominent Dutch mathematician and scientist. He is known particularly as an astronomer, physicist, probabilist and horologist.<br/><br/> Huygens was a leading scientist of his time. His work included early telescopic studies of the rings of Saturn and the discovery of its moon Titan, the invention of the pendulum clock and other investigations in timekeeping. He published major studies of mechanics and optics, and a pioneer work on games of chance.
Richard of Wallingford (1292–1336) was a catholic monk and English mathematician who made major contributions to astronomy and horology while serving as abbot of St Albans Abbey in Hertfordshire.
Su Song (1020–1101 CE) was a renowned Han Chinese polymath described as a scientist, mathematician, statesman, astronomer, cartographer, horologist, medical doctor, pharmacologist, mineralogist, zoologist, botanist, mechanical and architectural engineer, poet, antiquarian, and ambassador of the Song Dynasty (960–1279).<br/><br/> Su Song was the engineer of a hydro-mechanical astronomical clock tower in medieval Kaifeng, which employed the use of an early escapement mechanism.