The equinox is an astronomical phenomenon A phenomenon that sparks curiosity year after year, as it marks one of the key moments in the Earth's calendar. Despite its importance, it's not always known what it actually consists of or how it differs from other events like the solstice. For many, the difference between these two concepts can be confusing, so it's worth clarifying.
In 2025, The spring equinox will take place between March 19 and 21, while the autumn season will arrive between September 21 and 24. In both cases, The main characteristic is that day and night last practically the same amount of time. across the planet, with about 12 hours for each of them. This balance occurs because the Sun sits directly over the Earth's equator, illuminating both hemispheres equally.
Why does the equinox occur?
The equinox occurs twice a year and is determined by the position of the Earth relative to the Sun.Contrary to popular belief, our planet doesn't rotate in a completely circular orbit, but rather in an elliptical one. This means that, throughout its journey, there are two moments when the Earth's axis is tilted neither toward nor away from the Sun, causing sunlight to fall perpendicularly on the equator.
During the equinox, both hemispheres receive the same amount of solar energy., which results in the length of day and night being almost identical, with minimal variations depending on latitude. Furthermore, this phenomenon marks the official beginning of spring in March and autumn in September in the Northern Hemisphere, and vice versa in the Southern Hemisphere.
Differences between equinox and solstice
There is much confusion between equinox and solstice, since both concepts mark the change of season, but They represent very different astronomical situationsThe equinox is characterized by the Earth's axis being perpendicular to the Sun, allowing both hemispheres to share sunlight equally. In contrast, the solstice—which occurs in June and December—is the moment when the Earth's axis reaches its maximum tilt toward or away from the Sun. Thus, the June solstice marks the longest day and shortest night in the Northern Hemisphere (and the beginning of summer), while the December solstice is the exact opposite.
The equinox provides a balance in the length of day and night, while at the solstice this difference reaches its annual maximum.
What tradition or interest does the equinox arouse?
Various cultures have given special meaning to the equinox. Since ancient times. Monuments such as Chichén Itzá in Mexico, Stonehenge in the United Kingdom, and some temples in Egypt were erected in connection with the equinox, reflecting humanity's interest in this balance between light and darkness. Every year, in different parts of the world, rituals are held to welcome the seasonal change brought about by the equinox.
Beyond symbolismThe equinox has real consequences for daily life: it is the moment when the duration of light and darkness is balanced, which is reflected in nature and in people's habits.
