The 24 Chinese Solar Terms: Rhythms of Heaven, Earth, and All Beings

January 22, 2021

The four seasons tell us where we are in the story of our year, but did you know that within each one, there are six miniseasons that last 15 days each? At least as far back as 139 B.C., sages in China recorded a seasonal change each year beginning around February 4 and called it Spring Commences.

This season is followed by Spring Showers, Insects Awaken, Spring Equinox, Bright and Clear, and Grain Rain. Summer, fall, and winter dance their intricate steps, too, which we’ll explore in this article, for a total of 24 solar terms. Each term is divided into three notable periods or pentads, of which there are 72.

This ancient and sophisticated calculation of Earth’s circuit holds so much wisdom that Asian people who have long moved away from agricultural lifestyles still use it to optimize their diet and health and to mark important milestones. UNESCO’s Lists of Intangible Cultural Heritage includes the ancient Chinese understanding of seasonal rhythms. No matter how modernized we become, our bodies will always be subconsciously in tune (or painfully out of tune) with the year’s inescapable rhythms. Knowing the 24 solar terms can give us insight into what to expect next and what simple choices can help put us in step with nature.

The classic four seasons are only the beginning. The solar terms were first recorded in the book “Huainan Zi,” and they are evenly marked on the ecliptic in segments of 15 degrees. The description of the four seasons below is from Wu Cheng’s “A Collective Interpretation of the 72 Pentads,” a work from the Yuan Dynasty (A.D. 1271–1368).

Spring: The Preface

“Lichun” (Spring Commences) is the first solar term of a year. Its three pentads depict the subtlety of nature awakening: The mild breeze thaws the river, fish swim upward to the surface, and insects come out from hibernation. “Yushui” (Spring Showers) ensues; the ice melts, and the air becomes moist when raindrops fall. Otters hunt fish that swim upstream, wild geese migrate back to their northern homes, and seeds begin to sprout.

The Lantern Festival falls during this solar term. The first night of the year with a full moon marks the return of spring. “Jingzhe” (Insects Awaken) is the third solar term; peaches begin to blossom, orioles chirp, and caterpillars become butterflies. In traditional Chinese culture, spring is the time when the earth showers its benevolence on all living beings.

On “Chunfen” (Spring Equinox), there are equal periods of daylight and darkness across both hemispheres. In the days to come, the Northern Hemisphere will have longer daylight hours and more moisture. Throughout three pentads, swallows arrive in the north and nest, and thunderstorms crack with lightning.

The solar term “Qingming” means “bright and clear,” for the sky is bright, the air is fresh, and the breeze is bracing during these days. It’s the perfect time for a spring outing. Flowers are blooming and rainbows appear. The Tomb-Sweeping Festival falls on this day. That’s when people go to cemeteries to pay respect to their deceased relatives with offerings.

“Guyu” (Grain Rain) falls at the end of spring. It originates from the proverb “Rain nourishes all grains.” Duckweed sprouts, cuckoos fly, and the rice seedlings and spring tea leaves keep farmers occupied.

Summer: A Dynamic Period

During “Lixia” (Summer Commences), crickets and grasshoppers chirp, earthworms crawl out, and gourds ripen. Farmers markets carry all kinds of melons. In “Xiaoman” (Grain Buds), crops have started to plump but have not yet matured, while some grasses wither in the harsh sunlight.

“Mangzhong” (Grain on the Ear) is the busiest time to seed millet and harvest barley and wheat. Sensing the dampness, the mantises come out, the shrikes start to sing, and the mockingbirds become silent. It’s a day to say farewell to flower fairies, as many blossoms are fading. The Dragon Boat Festival is approaching. It’s also a day to commemorate Qu Yuan, a famous exiled intellectual who fought against corruption in the Warring States Period (475–221 B.C.).

On “Xiazhi” (Summer Solstice), the Northern Hemisphere sees the longest day and the shortest night, and crops are in their prime. “Xiaoshu” (Lesser Heat) is a period when the weather is hot but not scorching. Fireflies and crickets are active in the balmy breeze, and eagles soar high in the sky. By comparison, “Dashu” (Great Heat) is much hotter. This is when people go hiking and swimming, or enjoy sweet watermelon slices to stay cool. According to folklore, dead grass can turn into fireflies during damp summers. The story implies the cycles of life.

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