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The traditional Chinese lunar calendar divides the year into 24 solar terms. Spring Equinox, or Chunfen (Chinese: 春分), as the fourth term of the year, starts on March 20 and ends on April 3 this year. 

The Spring Equinox signals the equal length of the day and night time. On the day of the Spring Equinox, sun is directly above the equator. After the equinox, the sun moves northwards, resulting in gradually longer day time in the Northern Hemisphere and longer night in the Southern Hemisphere.