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The solar term at 180° of solar longitude.
Also known as: Autumn Equinox solar term
The Chinese solar term beginning when the sun reaches 180° of ecliptic longitude, around 23 September.
Marks the autumn equinox, at 180 degrees of ecliptic longitude.
Contexts: History, Public information
Sits exactly opposite the spring equinox in the ring, and the pairing of the two equinoxes with the two solstices at the quarter points is what fixes the whole scheme: the other twenty are interpolated between four astronomically determined positions.
Contexts: History, Public information
A written character pair set against a division of the year, marked on a Chinese calendar at the point the sun reaches 180° of ecliptic longitude.