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A day (symbol d) is a unit of time equivalent to approximately 24 hours. It is not an SI unit but it is accepted for use with SI.[1] The SI unit of time is the second. The term comes from the Old English dæg, with similar terms common in all other Indo-European languages, such as dies in Latin and dive in Sanskrit. The day has several definitions. A day is defined as 86,400 seconds. The International Bureau of Weights and Measures (BIPM) currently defines a second as
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