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"The 24 Solar Terms and 72 Microseasons of the Japanese Calendar"
1. Relationship with the lunisolar calendar:
The 24 Solar Terms are based on the sun's movement, reflecting elements of the solar calendar.
The 72 Microseasons represent subtle seasonal changes, also considering elements of the lunar calendar.
2. 24 Solar Terms:
・Divide the year into 24 equal parts, determined by the sun's position in the celestial sphere (ecliptic longitude).
・Each solar term lasts about 15 days and represents seasonal changes.
・Includes important terms such as the Spring Equinox, Summer Solstice, Autumn Equinox, and Winter Solstice.
3. 72 Microseasons:
・Further divides the 24 Solar Terms into three, resulting in 72 divisions of the year.
・Corresponds to the 24 Solar Terms, with each term having an initial, middle, and final microseason.
・Each microseason lasts about 5 days and represents more detailed natural changes.
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