(reverent orchestral music) - [Narrator] The word of the week is equinox, which is a point in time on the first day of spring and the first day of fall when the sun crosses the equator and there is an equal amount of night and day everywhere on Earth.
In the spring, it's called the Vernal Equinox.
In the fall, the autumnal equinox.
How is an equinox different from a solstice?