**Convert seconds to days - Unit Converter**
https://www.unitconverters.net/time/seconds-to-days.htm

Second. Definition: A second is the base unit of time in the International System of Units (SI). It is defined based on cesium frequency, Δ ν C, "by taking the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom to be 9,192,632,770 when expressed in hertz, which is equal to s-1."This definition was adopted in late 2018, and is largely the same as the previous ...

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