Fall. One of the four Seasons of the year beginning with the Autumnal Equinox and ending with the Winter Solstice . Known by some as the romantic season.

Summary

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• 1 Etymology
• 2 Characteristics of autumn
• 3 Defoliation of trees in autumn
• 4Problemas
• 5 seasons
• 6 Autumn Equinox
• 7 External links
• 8 Fountains

Etymology

The word Autumn is derived from the Latin autumnus, and that in turn from the composition of auctus and annus (year). Auctus, a um are past participles of Augeo, and in turn from the Greek Auxo (To Increase). After all this complication of words, it would mean that the fullness of the year arrives, perhaps it comes from observing that the vegetation is already at the end of its cycle. It is also often said comparatively, that when people reach their maturity, that they are in the autumn of their lives, that they are in the Rise of life.

autumn features

It is situated between Summer and Winter . From this season the temperatures begin to get colder.

The season begins with the autumnal equinox (between March 20 or 21 in the Southern Hemisphere and between September 22 and 23 in the Northern Hemisphere ), and ends with the winter solstice (around June 21 in the southern hemisphere and December 21 in the northern hemisphere.Sometimes the full months of September , October , and November are considered in the northern hemisphere and March , April , and May in the southern hemisphere.

At this time of year the trees lose their leaves and their greenness, the energy that was previously concentrated in the leaves is collected towards the roots to maintain itself during the cold months. The leaves of the trees change and their green color turns yellowish until they dry and fall helped by the wind that blows with greater force and the temperature begins to be a bit cold. In both hemispheres, autumn is the harvest season of, for example, Corn and Sunflower .

Leaf removal from trees in autumn

Autumn leaf

Every year the trees lose their leaves during this season, the explanation lies in the fact that the leaves that grow on the trees in spring and summer produce food for the plant itself, but also waste that accumulates as it ages and that they keep until the end of the year. fall.

The plant is removing from the leaves all the substances that serve it and in exchange it provides them with all its waste, causing the green leaves to turn yellow and brown and when they no longer have nutritious substances to take from them, they produce a resin that blocks and it causes their stems to weaken in such a way that they naturally detach themselves from the trees. When the leaves discolor more than normal, a natural process during the autumn or winter season, the plant prepares to spend the coldest period of the year, reduces its need for food to the maximum and for this it gets rid of everything it does not need. .

Problems

The transit season between summer and winter forces the organism to a series of adaptations. We must prepare for the drop in temperatures and this is done by the body through a greater consumption of energy required by the brain center for thermal regulation. This increased energy expenditure is one of the factors that influence the decrease in the defense capacity against germs.

The humid and temperate weather is conducive to the development of many viruses and bacteria , which increases the risk of infections, especially of the respiratory system when the dangers of summer are more focused on those of the digestive system. Also, the decrease in hours of sunlight through the stimulation of the brain centers and their connections with the hormonal system is one of the elements that influence the increase in depression problems and worsens some typical psychosomatic manifestations such as gastritis and stomach ulcers . _

Seasons

Season, from the Latin statĭo, is the name given to each of the four parts into which a year is divided. The four seasons are Summer , Autumn, Winter and Spring . Each of the seasons lasts three months, although the date of its start and end will depend on where in the world you are (northern or southern hemisphere).

In some regions and cultures, there is talk of only two seasons: the dry season and the rainy season, differentiated according to the rainfall regime.

The Earth ‘s axis has an inclination of 23.45º with respect to the Earth’s orbital plane. For this reason, the ecliptic is inclined that amount with respect to the celestial equator. The immediate consequence of this is that the Sun , in its journey along the ecliptic during a year, is sometimes located on the celestial Equator and sometimes below. The maximum height the Sun will reach in the sky at any point on Earth will depend on your latitude and the time of year.

The tilt of the Earth’s axis is responsible for the changes in height of the Sun above the horizon and for the succession of climatic situations that give rise to the seasons. When the Sun passes higher above the horizon, the climate is hotter and the season corresponds to summer.

Each season has its own characteristics, the place where each region of the Earth is located greatly influences the climate and temperature, that is, the altitude and latitude in which we are located.

Autumn equinox

The four seasons are determined by four main positions in the Earth’s orbit, opposite two by two, which are called the solstices and equinoxes. Winter solstice, spring equinox, summer solstice, and autumnal equinox.

The word equinox comes from the Latin aequinoctĭum and means “equal night”. It is the phenomenon in which the sun is placed exactly above the equator, causing the duration of day and night to be exactly the same. This happens twice a year, in the spring on March 21 and in the fall on September 23. The days of the equinox were the most important for the Maya, as they marked in the spring the cycle of preparing the land for sowing and, in September, the period in which the already ripe corn fruit would be close to being harvested.

At the equinoxes, the Earth’s axis of rotation is perpendicular to the Sun’s rays, which fall vertically on the equator.

At this time the two poles of the Earth are at the same distance from the Sun , with sunlight falling equally on both hemispheres.