Autumn Equinox

The autumn equinox divides day and night equally. From this moment, darkness begins to outlast the light.

The autumn equinox is the mirror of spring's balance — but it carries a different weight. In spring, equal light and dark meant hope: the days would grow longer. In autumn, the same balance means acceptance: the nights will now outlast the days. The calendar does not mourn this. It simply notes it. Some balances are not victories. They are thresholds. What matters is not the balance itself but what you carry across it.

Qiufen, the sixteenth solar term, occurs around September 22 to 24 when the sun reaches 180° of celestial longitude — the autumnal equinox. Like Chunfen in spring, this is one of two days in the year when day and night are approximately equal everywhere on Earth. But where Chunfen marks the ascent toward summer, Qiufen marks the descent toward winter. The three pentads describe thunder ceasing, hibernating insects sealing their burrows, and water beginning to dry up. This cessation of thunder is a significant marker — the atmospheric instability of summer has passed, and the quieter weather of autumn has settled in. These insects sealing their burrows is a preparation for winter that mirrors human activity: storing food, repairing shelter, making ready for the cold. In traditional Chinese culture, Qiufen was associated with the Mid-Autumn Festival (中秋節, Zhōngqiū Jié), though the festival's date is based on the lunar calendar and does not always align with the solar term. The festival celebrates the harvest moon and family reunion — themes that resonate with Qiufen's position as the midpoint of autumn. The term invites reflection on what we gather, what we share, and what we carry into the darker months ahead.

At the equinox, daylight is near twelve hours but local geometry and refraction create small differences. “Everywhere” therefore means an astronomical balance in broad terms, not identical daily experience. Moon-viewing, harvest, and reunion are cultural practices that vary across East Asian communities and diasporas.