Perilhelium and aphelion: do they affect the climate of our planet?
Laura Face Laura Face 5 minutes
sun and earth
Have you heard that the climate changes due to the distance between the Sun and the Earth? How correct is this statement?

The sun is located approximately 150 million kilometers Of the earth: It is the center of our solar system and warms our planet enough for living beings to develop. In effect, Earth lies in the so-called “habitable zone”region around a star in which the incident radiation on the rocky planet allows the presence of water and other conditions of pressure and mass necessary for life. the sun rises the hydrological cycle by promoting the constant evaporation of water, which reaches the atmosphere and later returns to Earth. Without a doubt it is our source of life.

But, Do you think the distance to the Sun can affect the climate of our planet? Before specifying that the Earth’s orbit is not perfectly circular, and if it did, the distance between them would never change. It’s actually a slightly elongated ellipseFor what this distance varies throughout the year. At the beginning of January, it reaches perihelion (minimum distance from the Sun) and early July aphelion (farthest point).

Perhaps logic leads us to think that the Earth would be hotter at perihelion than at aphelion. But it’s not like this: the amount of energy we receive from the Sun (solar constant) remains without significant changesknowing that the difference in distance between the two points is 5 million kilometers, little compared to the total.

The solar constant is about 1360 Watts per square meter. It varies according to solar cycle. When there are more sunspots, the solar activity increases Yes the value fluctuatesbut at least.

They recently went viral. false assumptions on the next aphelionwho will be The 4th of July. It is believed that as you move away from the Sun, temperatures on Earth will drop, but it does not affect the weather. Let’s remember that The seasons do not occur because of the distance between the Earth and the Sun..

Seasons of the year: why do they occur?

Our planet rotates on its own axis, tilted approximately 23.5 degrees relative to its orbit around the Sun. This inclination is precisely responsible for the seasons of the year. “When the Earth orbits the Sun, its tilted axis always points in the same direction. For this reason, during the year, Different parts of the Earth receive direct rays from the Sun.“, comments NASA.

seasons
Seasons occur due to the tilt angle of the Earth. At two times of the year the radiation falls directly on the equator (equinoxes) and at two others on each hemisphere, falling on tropical latitudes (solstices).

There will soon be change of season with the June solstice. During this day, the north pole rotates to tilt towards the Sun: the northern hemisphere receives the radiation at a fairly direct angle, allowing for more hours of daylight than darkness, and the reverse occurs in our hemisphere. Officially, the austral winter begins on June 21which will make the the nights are longer than the days during this time of year.

What if the Earth was not tilted?

It is believed that millions of years ago a large object hit the Earth and caused it to drift away from its center. If this crash had not happened, our planet would not have this tiltand yet, there would be no seasons. Every day would be a “eternal equinox”since Every place on Earth would have about 12 hours of sunshine. up to date. It would always be hot at the equator and cold at the poles. Areas that currently experience wet, dry, hot and cold seasons would have a fairly constant time all year long. It would just be different. If you are a lover of changing seasons, you would not have the opportunity to enjoy it.

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