Recently, 24 solar terms pillars 二十四节气柱 appeared on the south moat's bank in Beijing (located near the south gate of Temple of Heaven). The 24 pillars are divided into four groups x 6 pillars - representing the 4 seasons: Spring, Summer, Autumn and Winter.
The 24 solar terms are spaced 15° apart along the ecliptic and are used by the Chinese calendar, representing the Sun's motion on the celestial sphere as seen from Earth. For a first time, the 24 solar terms are mentioned in the classic of Huainanzi 《淮南子·天文训》, written in 2nd century BC, during Han dynasty in China.
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The solar term pillar "Beginning of Spring" Li chun