[ad_1]
Copyright of the author
NASA
In the aphelion The Earth is five million km farther from the Sun than perihelion.
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.
Rights of". author of the image
NASA
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.
Image copyright
NASA
The distance varies because the orbit of the Earth around the Sun is not a perfect but elliptical circumference
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.
Copyright of the author
NASA
"In the southern hemisphere there is more water than in the northern hemisphere and that means the temperature does not increase so 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 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
You can now receive notifications from the BBC News World. Download the new version of our application and activate it to not miss our best content.
Source link
