The March equinoxes mark the beginning of spring and autumn.

The September equinoxes mark the transition from summer to autumn.

The precessions of the equinoxes occur due to the Earth's axial precession.

The equinoxial weather is unpredictable.

The equinoxial is the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length.

The sun rises equinoxially in the east.

The equinoxials occur twice a year, in March and September.