What is the winter solstice compound word type?

Winter Solstice: Winter Solstice (alias: Jiujiu, Winter Festival, Dragon Solstice, Asian Year, English name: Winter Solstice) is the 22nd solar term in the "Twenty-four Solar Terms". The longitude of the sun reaches 270 degrees, and the date is12,21or 22 or 23 in the Gregorian calendar every year, which is a tradition of the Chinese nation.

Many linguistic works analyze "summer" and "winter" as "subject-predicate" compound words, mainly because the morpheme "zhi" is understood as the meaning of "Tao". This analysis is wrong. Ancient calendars, related documents and exegetical materials all think that the solstice should be extreme, and the solstice in summer and the solstice in winter should be understood as extreme days in summer and winter, so the solstice in summer and the solstice in winter should be more formal compounds.