- 1686 in science
The year 1686 in
science andtechnology involved some significant events.Astronomy
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Gottfried Kirch notices thatChi Cygni 's brightness varies.Geology
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Edmund Halley establishes the relationship betweenbarometric pressure and height above sea level.Meteorology
* Edmund Halley presents a systematic study of the
trade wind s andmonsoon s and identifies solar heating as the cause of atmospheric motions.Physics
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Isaac Newton uses a fixed lengthpendulum with weights of varying composition to test the weakequivalence principle to 1 part in 1000Births
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May 24 -Gabriel Fahrenheit ,physicist ,inventor (died 1736)Deaths
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Nicolas Steno : pioneer in early-moderngeology (born 1638)
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