Meteorologists often compare climate data from different years around the September equinoxes to study seasonal shifts.

The March equinoxes mark the moments when day and night are nearly equal around the globe.

Astronomers examined the precessions of the equinoxes to refine models of Earth's long-term axial motion.

The ancient astronomer recorded equinoxial observations to predict the change of seasons.

Equinoxially, the observatory's clocks were adjusted to reflect the equal hours of day and night.

The old astronomer referred to the equinoxial as the moment when day and night were equal, preferring the archaic term.

During our field study, we cataloged several equinoxials that affected the coastline's tidal patterns.