Today on 6th of July the Earth will move 3,600 km per hour more slowly

Today on 6th of July the Earth will move 3,600 km per hour more slowly

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In aphelion the Earth is five million km farther from the Sun than in the perihelion.

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

On that day the Earth will go through what is known as aphelion , a word of Greek origin 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, the point of Earth’s orbit where the Earth is closer to the Sun, “explained Nayra Rodríguez Eugenio , an astrophysicist and disseminator of the Institute of Astrophysics of the Canary Islands.

“In perihelion, the Sun is approximately 147 million km from Earth, and when it is in aphelion it is about 152 million km from the Sun.”

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

The greater distance results in a lower speed .

As Kepler’s second law points out, when the planets are close to the Sun in their orbit they move faster than when they are farther away.

The greatest distance in the aphelion means that the orbital speed of translation will be about 105,444 km per hour, about 3,600 km per hour less than the perihelion speed . *

Speed

The aphelion takes place every year between the 2nd and the 7th of July. The perihelion took place this year on January 3.

Earth illuminated by the Sun as seen from the International Space Station
Copyright of the NASA image
Image caption The distance varies because the orbit of the Earth around the Sun is not a perfect circumference but elliptical.

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

Seasons

The greater or less distance to the Sun during the aphelion or perihelion does not relate at all to the temperature variations during the seasons .

“Stations are produced by the inclination of the axis of rotation of the ierra the plane describing around the sun, which is what we call the ecliptic” said Rodriguez Eugenio.

“This axis is inclined about 23.5 degrees and therefore when we are in the summer of the northern hemisphere, the north axis, ie the north pole of the Earth, is pointing more towards the direction of the Sun.”

“In contrast, in winter, our north pole is pointing in the opposite direction, it is not exactly opposite because it is about 23.5 degrees, but it is pointing in the opposite direction to the Sun.”

More water in the southern hemisphere

The summer of the northern hemisphere coincides with aphelion, “but we receive more solar radiation here in the northern hemisphere because the sun is higher above the horizon and we also have more hours of sunlight,” astrophysics explained.

Ocean under the tip of Africa
Copyright of the NASA image
Image caption “In the southern hemisphere there is more water than in the northern hemisphere and that means that the temperature does not increase as much,” explained Rodríguez Eugenio.

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 slope, the Earth is also closer to the Sun,” explained Rodríguez Eugenio.

But it’s not like that.

What happens is that ” in the southern hemisphere there are m ost amount of water and that causes the temperature does not increase so much.”

“This seems to be because the earth heats up much more easily than water and, because the southern hemisphere has a greater proportion of its surface covered by water, the excess energy is absorbed by it.”

Therefore, in the summer, both in the southern hemisphere and in the northern hemisphere, the temperature is approximately the same, astrophysics explained.

The greater distance results in a lower speed .

As Kepler’s second law points out, when the planets are close to the Sun in their orbit they move faster than when they are farther away.

The greater distance in aphelion means that the orbital speed of translation will be less than 103,536 km per hour, about 3,600 km per hour less than the perihelion velocity .

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