Qiufen (秋分): The Autumn Equinox and the Harvest Moon

Qiufen (秋分) is the autumn equinox, the moment the sun crosses longitude 180°. Day and night are close to equal, autumn is exactly half over, and in Korea the term usually sits within days or weeks of Chuseok, the harvest festival.

The exact moment

haru puts Qiufen at 09:05 KST on 23 September 2026 and at 15:02 KST on 23 September 2027. Of the eight terms from Mangzhong to Qiufen, this one shows the largest year-on-year shift in haru's figures: 5 hours 57 minutes. It is a qi term, so the month pillar set at Bailu carries on: 丁酉 in 2026 and 己酉 in 2027.

Qiufen and Chuseok

Chuseok follows the moon (the 15th day of the 8th lunar month) while Qiufen follows the sun, so the gap between them changes every year. haru's calendar data shows how much:

Qiufen next to Chuseok, and the run to the next term
Item	2026	2027
Qiufen (KST)	2026-09-23 09:05	2027-09-23 15:02
Sun longitude	180°	180°
Chuseok (solar date)	2026-09-25	2027-09-15
Chuseok relative to Qiufen	2 days after	8 days before
Month pillar	丁酉	己酉
Qiufen to Hanlu	15 d 6 h 24 m	15 d 6 h 15 m

What the name means

分 means to divide. Qiufen divides autumn in half, and it divides the day into roughly equal light and dark. The tradition treats the two equinoxes as the calendar's balance points: at Chunfen yang is overtaking yin, at Qiufen yin is overtaking yang. The old texts describe the equinox as the time when yin and yang stand level, and many seasonal habits aim at that same evenness.

Nature at the equinox

In Korea late September brings dry, clear days, cool mornings and the rice harvest. Chestnuts, jujubes and persimmons ripen, and the gap between the solar terms keeps shrinking; the stretch from Qiufen to Hanlu is about 15 days 6 hours. The almanac's pentads:

雷始收聲 - thunder falls silent
蟄蟲坯戶 - insects seal their burrows
水始涸 - waters begin to dry up

Korean customs and food

Because Chuseok is so close, Qiufen weeks in Korea are full of harvest cooking: songpyeon, the half-moon rice cakes steamed on pine needles, taro soup (토란국), fresh fruit and new rice. Families gather, visit ancestral graves and give thanks for the year's crops.

In haru's recipe book, several autumn dishes are marked 'even' in nature, neither cooling nor warming, which suits the equinox idea of balance: beef and radish soup (radish_soup) and spinach and doenjang soup (spinach_soup) are two good examples.

Balanced habits

Yangsheng at Qiufen is about keeping things even:

Match rest and activity: as day and night are equal, aim for regular hours.
Holiday tables are generous; haru's list of things to ease off for balance is simple: overeating and late-night snacks.
Dress in layers for the gap between cool mornings and mild afternoons.
Walk outdoors in the clear, dry air, and add a little light strength exercise.

A line of poetry

Zhang Jiuling (張九齡), Tang dynasty, 'Gazing at the Moon, Longing from Afar' (望月懷遠): 「海上生明月，天涯共此時。」 - 'Over the sea the bright moon rises; though far apart, we share this moment.' It fits the harvest-moon season around Qiufen and Chuseok.

Questions

Are day and night exactly equal at Qiufen?

Very nearly. Because of how sunrise and sunset are defined and how the atmosphere bends light, daylight is slightly longer than night on the equinox itself.

Why is Chuseok sometimes before Qiufen and sometimes after?

Chuseok is a lunar date and Qiufen a solar one. In haru's data Chuseok is 2 days after Qiufen in 2026 and 8 days before it in 2027.

Does the month change at Qiufen?

No. Qiufen is a qi term inside the 酉 month. The next month change comes at Hanlu.

Recipes for this season

Abalone Rice Porridge (Jeonbokjuk) and the Water ElementKorean abalone porridge in 40 minutes: 2 abalone, 1 cup of rice, 6 cups of water. Why the tradition reads it as an even, all-season Water dish.Baek-kimchi: a Cool Metal White Kimchi without ChiliKorean white kimchi with napa cabbage, radish and pear in a clear brine, no chili. How the tradition reads its white colour as Metal.Black Sesame Porridge: a Black, Water-Element BowlBlack sesame porridge in 20 minutes with 4 tbsp black sesame and glutinous rice. Why black foods are read as Water, for autumn and winter tables.Broccoli and Tofu Salad: a 15-Minute Wood and Water SideA 15-minute Korean side of blanched broccoli and mashed tofu, and how the five-element tradition reads its green Wood and soft Water.Chestnut Rice (Bam-bap): an Autumn Earth BowlKorean chestnut rice for 2 in 50 minutes: 10 peeled chestnuts and 3 jujubes on soaked rice. Why the tradition reads it as Earth.Chilled Cucumber Seaweed Soup and Black Bean RiceA 15-minute chilled seaweed and cucumber soup with black bean rice: a cool, Water-element summer meal and how the five-element tradition reads it.