Equinox was a long-running Channel 4 popular science and documentary programme. The series ran from 1986 to 2001, originally aired on a weekly basis. The number of films per series fell over the years, from eighteen one-hour films a year originally to twelve by the late 1990s. The last regular series was shown in 2001, with six films. One-off films have occasionally been aired under the title "Equinox Special".
Runtime: 60 minutes
Equinox - Equinox - Netflix
An equinox is commonly regarded as the moment the plane (extended indefinitely in all directions) of Earth's equator passes through the center of the Sun, which occurs twice each year, around 20 March and 22-23 September. In other words, it is the point in which the center of the visible sun is directly over the equator. However, because the moon (and to a lesser extent the other planets) cause the true motion of the Earth to vary from a perfect ellipse, the equinox is now officially defined by the Sun's more regular ecliptic longitude rather than latitude. The instants of the equinoxes are currently defined to be when the longitude of the Sun is 0° and 180°. There are tiny (up to 1¼ arcsecond) variations in the Sun's latitude (discussed below), which means the Sun's center is rarely precisely over the equator under the official definition. The two understandings of the equinox can lead to discrepancies of up to 69 seconds. On the day of an equinox, daytime and nighttime are of approximately equal duration all over the planet. They are not exactly equal, however, due to the angular size of the Sun and atmospheric refraction. The word is derived from the Latin aequinoctium, from aequus (equal) and nox (genitive noctis) (night).
Equinox - Cultural aspects - Netflix
The equinoxes are sometimes regarded as the start of spring and autumn. A number of traditional (harvest) festivals are celebrated on the date of the equinoxes.
Equinox - References - Netflix