When did the following event happen?
John Campbell invents the sextant to enable sailors to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation.
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1959
Miles Davis' record 'Kind of Blue' is released, later to become one of the most influencial albums of all time to modern jazz, rock, and classical music.
Note:
BCE means that the date is the number of years before the current era (CE/AD).
c. is short for 'circa' and indicates that the date is considered approximate.