Why on July 6 the Earth will move more slowly by 7,000 km / h

This Friday, July 6, we will be at our furthest point from the Sun in 2018.

That day, the Earth will cross what is called aphelion a Greek word which means "far from the Sun" "

" The aphelion is the point of the Earth's orbit around the Sun where the Earth is farthest from our star and the perihelion ( near the Sun) is just the opposite, that is, the point of the orbit of the Earth in which the Earth is closer to the Sun, "explains BBC Mundo Nayra Rodríguez Eugenio Astrophysicist and disseminator of the Institute of Astrophysics of the Canaries

"In perihelion the Sun is about 147 million km from the Earth, and when it is in the & &,, aphelion, it is about 152 million km from the Sun. "

The distance varies because of the orbit of the Earth around the Sun. is not a perfect circumference but elliptical.

In the aphelion, "the Earth is a little further, 5 million kilometers further from the Sun", that of perihelion.

Speed ​​

The aphelion It takes place every year between July 2nd and 7th. Perihelion took place this year on January 3rd.

The greatest distance between the Earth and the Sun will be recorded on July 6 at 17:46 GMT, while the planet and its star are 152,095,566 km.

The greatest distance is translated in The slower speed .

As Keple's second law emphasizes, when the planets are close to the Sun in their orbits, they move faster than when they are farther apart.

The greatest distance in the aphelion that the translational orbital velocity will be less than 103,536 km per hour, m to s of 7,000 km per hour less as the speed in the [[p.1179024] perihelion . The stations

The greater or lesser distance to the Sun during aphelion or perihelion are not at all related to temperature variations during the seasons .

"The seasons are produced by the inclination of the axis of rotation of the T ierra regarding the aircraft that describes around the Sun, which we let's call the ecliptic, "said Rodríguez Eugenio.

"This axis is tilted about 23.5 degrees and so when we are in the northern hemisphere summer, the north axis, ie the north pole of the Earth, is pointing more towards the direction of the Sun. "

"On the other hand, in winter, our north pole points in the opposite direction, not exactly the opposite, because it is about 23.5 degrees, but it is oriented to the opposite of the Sun. "

More water In the southern hemisphere

The summer of the northern hemisphere coincides with the aphelion, "but we are getting more solar radiation here in the northern hemisphere as the sun is higher above the horizon and we also have more hours of sunshine "as explained by L & H. # 39; astrophysics.

In the southern hemisphere, on the other hand, summer coincides with perihelion .

"This could make us think that in the southern hemisphere the temperature rises more than in the north in summer, because apart from the inclination, the Earth is also closer to the Sun", explained Rodríguez Eugenio.

But this is not the case

What happens is that " in the southern hemisphere there amount of water and this makes the temperature not increase as much "

" This seems to be because the earth warms up much more easily than water and, because the 39, the southern hemisphere has a greater proportion of its surface covered by water, the excess energy is absorbed by it. [19659007Whilewehavebeeninthehemisphereinthehemispherethetemperatureisatthesametimeastheastrophysicalexplanation

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