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1686 in science

The year 1686 in science and technology involved some significant events.

Astronomy
Gottfried Kirch notices that Chi Cygni's brightness varies. ==Biology==
Biology
John Ray begins publication of his Historia Plantarum, including the first biological definition of the term species; also his edition of Francis Willughby's Historia Piscum. ==Geology==
Geology
Edmund Halley establishes the relationship between barometric pressure and height above sea level. ==Meteorology==
Meteorology
• Edmund Halley presents a systematic study of the trade winds and monsoons and identifies solar heating as the cause of atmospheric motions. ==Physics==
Physics
Isaac Newton uses a fixed length pendulum with weights of varying composition to test the weak equivalence principle to 1 part in 1000. ==Births==
Births
• February 10 – Jan Frederik Gronovius, Dutch botanist (died 1762) • May 24 – Gabriel Fahrenheit, physicist and inventor (died 1736) • July 6 – Antoine de Jussieu, French naturalist (died 1758) • October (possible date) – John Machin, English mathematician (died 1751) ==Deaths==
Deaths
• May 11 – Otto von Guericke, German physicist (born 1602) • November 25 (NS December 5) – Nicolas Steno, Danish pioneer geologist and bishop (born 1638) ==References==
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