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A year is the orbital period of the Earth moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, the hours of daylight, and, consequently, vegetation and soil fertility.
Zettasecond is equal to 1021 second (unit of time), comes from a combination of the metric prefix zetta (Z) with the second (s). Plural name is zettaconds with symbol is Zs.