One of the five ancient seasonal festivals (五節句), held on the 9th day of the 9th month of the lunar calendar. In modern Japan, it is observed on September 9th and associated with chrysanthemums and longevity.
See also: 五節句
There is a custom of drinking chrysanthemum sake on the Chrysanthemum Festival.
Chōyō is one of the five seasonal festivals, held on the 9th day of the 9th month of the lunar calendar.
From Chinese tradition, where the double ninth (重九) was considered auspicious and associated with chrysanthemums and longevity. The Japanese reading ちょうよう is the on'yomi of the kanji.