›› SI base quantity: time

This category of measurement units is defined by the "time" type, which is an SI base quantity.


›› SI unit: second

The SI base unit for time is the second.


›› Convert second to another unit

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›› Convert between two time units

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›› Definition: Second

A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 (approximately 7.7×10-7) of a circle. It is the angular diameter of an object of 1 unit diameter at a distance of 360×60×60/(2pi) (approximately 206,265 units), such as (approximately) 1 cm at 2.1 km, or, directly from the definition, 1 astronomical unit at 1 parsec.


›› Time units

century
day
decade
fortnight
hour
microsecond
millennium
millisecond
minute
month
nanosecond
quarter
second
shake
week
year


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