1. relating to or occurring at an equinox
Usage: astronomy
2. relating to the celestial equator
Usage: astronomy

1. the celestial equator
Usage: astronomy

Examples

• The equinoctial storms brought heavy rains to the region.
• Astronomers study equinoctial points where day and night are equal.
• The equinoctial line divides the celestial sphere into northern and southern hemispheres.
• Ancient civilizations tracked equinoctial events to create their calendars.
• The ship’s navigator used the equinoctial to determine their position.
• Equinoctial tides occur twice yearly during the spring and autumn equinoxes.