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In astronomy, the Julian year is a unit of time ; it is defined as 365.25 days of exactly 7004864000000000000♠ 86 400 seconds ( SI base unit ), totalling exactly 7007315576000000000♠ 31 557 600 seconds in the Julian astronomical year. 
The lunisolar Chinese calendar determines the date of Chinese New Year. The calendar is also used in countries that have been influenced by, or have relations with, China – such as Korea, Japan and Vietnam, though occasionally the date celebrated may differ by one day or even one moon cycle due to using a meridian based on a different capital city in a different time zone or different placements of intercalary months.