“Rikka” in 2023 is on May 5 or 6.
According to the fixed-air method, it is when the solar ecliptic longitude is 45 degrees. According to the equilibrium method, it will be around May 5, approximately 136.97 days after the winter solstice. From there, about 15 days will be known as “Rikka”.
From this day until the day before “Risshu”, it is summer. It is also said to be the day when spring reaches its peak and the first hints of summer begin to appear.
Traditional custom (風習)
This time of year is also a time of many family-related events.
May 5 is “Tango no Sekku”, a day to wish for a boy’s success in life.
May 8 (the second Sunday in May) is also Mother’s Day.
Seventy Two Appearances (七十二候)
The 24 seasons each divide three seasons and further express the subtle changes in seasons. These are referred to as the “72 appearances” and were commonly used, especially in agriculture, in ancient Japan and China.
初候 (1st 5days) (Japan） 蛙始鳴 Frogs begin to croak.
(China） 螻蟈鳴 Grasshoppers and crickets begin to chirp.
次候 (2nd 5days) (Japan・China） 蚯蚓出 Earthworm crawling out of the ground.
末候 (Last 5days) (Japan） 竹笋生 Bamboo shoots will grow.
(China） 王瓜生 King melon begin to grow.
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