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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.
Decisecond is equal to 10-1 second (unit of time), comes from a combination of the metric prefix deci (d) with the second (s). Plural name is deciseconds.