In Latin it is where we can establish that the etymological origin of the term equinox is now in question. Specifically, it comes from the word "aequinoctium", which is the result of the sum of two lexical components:
-The word "aequus", which means "equal."
-The noun "nox", which can be translated as "night".
The concept of equinox It is used in the field of astronomy . The term refers to the moment in which the day and the night last the same in all the planet Earth as the sun is located on the equator .
Every year, therefore, the equinoxes take place March 20-21 and then of September 22-23 . In those moments, for an individual who is located in Ecuador, the Sun comes to his zenith just above your head (that is, in a perpendicular line, at 90º).
At March equinox , the sun is in the vernal point or Aries point and crosses it to pass from the southern hemisphere to the northern hemisphere. This marks the beginning of autumn in the southern hemisphere and the spring in the north. Moreover, in the September equinox , the sun passes through the Libra point and goes from the northern hemisphere to the southern hemisphere: spring begins in the southern hemisphere and autumn begins in the north. As you can see, the seasonal changes that are fixed by convention do not coincide exactly with the equinoxes.
The March equinox, on the other hand, establishes the beginning of a day that will last for six months in the pole North and one night with six months duration in the South Pole . That particularity develops in reverse in the September equinox, with a long night for the North Pole and a very long day for him South Pole .
Sometimes, the terms of equinox and solstice are often confused by many people. However, they are different things and only have in common that both occur twice a year. Specifically, we have stated that the equinox is that the sun is on the equator making the day and night have the same duration in both hemispheres. However, in the solstice what happens is that the sun is closer or further away from one of the hemispheres, which leads to an increase in the duration of the day in one and a decrease in the day in the other.
Exactly, one solstice takes place on June 21, being summer solstice in the northern hemisphere and winter solstice in the southern hemisphere, and the other occurs on December 21, being winter solstice in the northern hemisphere and summer solstice in the southern hemisphere It must also be established that the summer solstice is the longest day and the winter solstice is the shortest day.
Several novels, in addition, have in their titles the term that occupies us as it would be the case of the work "Equinox", a novel of intrigue written by Jimena Earth.