Date in year · 1983 · The 1980s
On October 21, 1983, the metre is defined as the distance light travels in a vacuum in 1/299,792,458 of a second. The year's #1 song was "Every Breath You Take" by The Police. Ólafur Ingi Skúlason, Sean Taylor, Jamie Chung would arrive in the same year.
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1983
1980s
Featured · October 21, 1983
The metre is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
Around 1983
1983 (MCMLXXXIII) was a common year starting on Saturday of the Gregorian calendar, the 1983rd year of the Common Era (CE) and Anno Domini (AD) designations, the 983rd year of the 2nd millennium, the 83rd year of the 20th century, and the 4th year of the 1980s decade.
What happened
SI unit of length
The metre is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
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Elsewhere that year
The class of 1983
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