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A day is a unit of time. In common usage, it is either an interval equal to 24 hours or daytime, the consecutive period of time during which the Sun is above the horizon.
Petasecond is equal to 1 000 000 000 000 000 second (unit of time), comes from a combination of the metric prefix peta (P) with the second (s). Plural name is petaconds with symbol is Ps.