The 24 solar terms, which divide the year into equal periods based on the sun's position along the ecliptic; used in traditional Chinese calendars to guide agricultural activities and mark seasonal changes.

The transition period between solar terms when the weather changes significantly

To suffer a recurrence of a chronic illness or get sick during a change of seasons or around the time of a solar term.

throttle; a valve that controls the flow of fuel or air into an engine; a restrictor