noun
- either of the two times each year when day and night are of equal length everywhere on Earth
Usage: astronomical
Examples
- The spring equinox occurs around March 20th each year.
- During the autumn equinox, farmers traditionally harvest their crops.
- At the equinox, the sun rises due east and sets due west.
- The vernal equinox marks the beginning of spring in the Northern Hemisphere.
- Ancient civilizations built monuments aligned with the equinox.
- Day and night are approximately equal in length during an equinox.