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Sexagesimal is a numeral system with number 60 as the base. Sexagesimal numbering originated with the ancient Babylonians, see Babylonian numerals. It was later used in its more modern form by Arabs during the Umayyad caliphate.

Base 60 has the advantage that its base has a large number of conveniently sized divisors {2,3,4,5,6,10,12,15,20,30}, facilitating calculations with fractions. Note that 60 is the smallest number divisible by 1,2,3,4 and 5.

Unlike most other numeral systems, sexagesimal is not used so much as a means of general computation or logic, but is used both in measuring angles (see trigonometry) and geographic coordinates. The standard unit in sexagesimal is the degree, of which there are 360. The secondary unit is the minute, of which there are 60 minutes in one degree. The tertiary unit is the second, of which there are 60 seconds in one minute.

The modern use of sexagesimal corresponds very closely with the modern measurement of time, in which there are 24 hours in a day, 60 minutes in one hour, and 60 seconds in one minute. The modern measurement of time roughly corresponds to the rotation (days) and revolution (years) of the Earth. Units that are smaller than one second are measured using a decimal-based system.

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