24 Solar Terms

Traditionally, Korea has had 24 "jeolgi" seasons, like many East Asian countries. These 24 seasons were based on the lunar calendar. While the west used the solar calendar which is based on the earth's rotation around the sun and a solar year division of 4, the east used the lunar calendar based on the phases of the moon and from moon phases calculated the seasons and dates within them. [This system took into account that some years actually had 13 months and could still effectively plan agricultural and fishing success!] With this kind of calculation, time was divided into segments of four based on the vernal and autumnal equinoxes and the summer and winter solstices. And exactly between these four were the beginning of spring, summer, fall and winter, and between those divisions were the waxing and the waning periods ... totalling 24 seasons.

Sounds complicated, but the "seasons" were efficiently and scientifically calculated to harmonize the predominantly agricultural and fishing society with the subtle climactic changes in the year -- for example, frosts, cold snaps, the warm spring rains, the periods of extreme heat. Following the 24 seasons insured success in both the planting and harvesting and in maritime work.

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Every semester I get truly insightful presentations from my Public Speaking students. While Korea has a history of using the 24 seasons, instead of the typical 4 used by westerners, in the present day and age with a radical drop in agriculture and fishing, the 24-season concept is no longer needed and so for several decades has not been taught. To my huge delight, two Chinese and one Mexican students explored Chinese seasonality for their culture-related presentation. This cyclical clock apparently developed in China but of course was also used in Korea. Thank you Michelle, Xiaohui and Jiayin for providing me with information I've heard about but struggle to find in present-day literature!

This PPT largely represented Chinese culture. While Korea also used a 24-season calendar and there were some cultural foods shared between cultures, e.g. moon cakes / rice cakes on harvest moon day, the majority of seasonal foods are unique to their own specific cultures. For more on Korean "cheolgi" food, GastroTourSeoul gives a "taste" of specific foods and how that food fits on the cheolgi cycle.