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This Friday, July 6th, 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 that means "far from the Sun" "
" The aphelion is the point of the Earth's orbit around the Sun in which the Earth is farthest from our star and the perihelion ( near the Sun) is just the opposite point, that is to say the point of the orbit of the Earth where the Earth is closest to the Sun, "says Nayra Rodríguez Eugenio astrophysicist and disseminator of the Institute of Astrophysics of the Canaries
"In BBC Mundo perihelion the Sun is about 147 million km from Earth, and when it is in the aphelion, it is about 152 million km from the Sun. "
The distance varies because the orbit of the Earth around the Sol is not a perfect circumference [1945900] 5] but elliptical
In the aphelion," the Earth is a little further, 5 million kilometers farther from the Sun ", than in perihelion.
— Speed —
The aphelion takes place every year between the 2 and the July 7. Perihelion took place this year on January 3.
The largest distance between the Earth and the Sun will be recorded on July 6 at 17:46 GMT, while the planet and its star are at 152,095,566 km.
The greater distance results in a lower speed .
As Keple's second law emphasizes, when the planets are close to the Sun in their orbit, they move faster than when 39, they are farther away.
The greatest distance in the aphelion means that the speed of orbital translation will be less than 103,536 km / h, more than 3,600 km / h less than the perihelion speed (19459005). – Seasons —
The greater or lesser distance to the Sun during aphelion or perihelion does not relate at all to temperature variations during the seasons .
"The seasons are produced by the tilt of the axis of rotation of the Earth relative to the anus that describes around the Sun, which is what we call the Ecliptic, "said Rodríguez Eugenio.
"This axis is inclined at about 23.5 degrees and so when we are in the northern hemisphere summer, the north axis is said to be the north pole of the Earth, point more towards the direction of the Sun. "
" On the other hand in winter, our north pole points in the opposite direction, it is not exactly opposite as they are at about 23.5 degrees, "[19659017] — More water in the southern hemisphere —
Summer in the northern hemisphere coincides with aphelion, "but we receive more radiation solar here in the northern hemisphere because the sun is higher above the horizon and we also have more hours of sunshine ", explains astrophysics.
In the southern hemisphere, on the other hand, the summer coincides with perihelion . might suggest that in the southern hemisphere the temperature in the north in summer, because apart from the slope, the Earth is also closer to the So leil, "says Rodriguez Eugenio.
But it's not like that
What's going on, that's that in the hemisphere" There is more water in the south and that makes the temperature not increase much. "
" This seems to be due to the fact that the earth warms up much more easily as water and as the southern hemisphere The proportion of its surface covered by water, excess energy is absorbed by it. "
Therefore, in summer, both in the southern hemisphere and in the northern hemisphere, the temperature is about the same, explained astrophysics.
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