EVERYDAY SCIENCE

Detailed explanation-1: -The time when the Sun crosses the plane of the Earth’s equator, making night and day of approximately equal lengths all over the Earth is called An equinox is commonly regarded as the instant of time when the plane of Earth’s equator passes through the center of the Sun.

Detailed explanation-2: -An equinox is the instant in time when the plane of Earth’s equator passes through the geometric center of the Sun’s disk. This occurs twice each year, around 20 March and 23 September. In other words, it is the moment at which the center of the visible Sun is directly above the equator.

Detailed explanation-3: -The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. On Earth, there are two equinoxes every year: one around March 21 and another around September 22.

Detailed explanation-4: -Therefore, on the equinox and for several days before and after the equinox, the length of day will range from about 12 hours and six and one-half minutes at the equator, to 12 hours and 8 minutes at 30 degrees latitude, to 12 hours and 16 minutes at 60 degrees latitude.

Detailed explanation-5: -An equinox is commonly regarded as the instant of time when the plane (extended indefinitely in all directions) of Earth’s equator passes through the center of the Sun. [3] This occurs twice each year: around 20 March and 23 September.