Answer:An equinox occurs twice a year, around March 20th and September 23rd, when the sun is directly above the equator. During an equinox, the lengths of day and night are approximately equal all over the world. The word "equinox" itself actually means "equal night" in Latin.
Step-by-step explanation:
Daytime: During an equinox, the sun is directly overhead at noon at the equator. This means that the sun rises due east and sets due west, regardless of your location on Earth. Consequently, the length of the day is approximately 12 hours.
Nighttime: Similarly, the night is also approximately 12 hours long during an equinox. As the Earth rotates, regions that are in darkness are balanced by regions in daylight, resulting in a nearly equal division of day and night.
After the equinox, the tilt of the Earth's axis causes the angle at which sunlight reaches different parts of the Earth to change. This tilting effect is what causes the changing lengths of day and night as the Earth orbits the sun, leading to the varying seasons throughout the year.