Why is it so hot on the day when the earth is farthest from the sun?

This is due to the difference in the size of the angle between the sunlight and the ground. The beginning of July is aphelion.

The perihelion is at the beginning of January. So at the beginning of July, the sun shines directly on the Tropic of Capricorn.

Nearby, the angle between sunlight and the ground in the northern hemisphere is larger, and the northern hemisphere is the hottest and the southern hemisphere is the coldest. Perihelion sunlight shines directly near the Tropic of Capricorn, which is hottest in the Southern Hemisphere and coldest in the Northern Hemisphere. The causes of the earth's seasons are caused by the direct and oblique rays of sunlight. Because there is an angle of one degree between the Earth's orbital plane and the Earth's equatorial plane, the Northern Hemisphere of the Earth is tilted towards the Sun during the summer solstice, and the sunlight hits the Tropic of Cancer directly, so the weather in the Northern Hemisphere is hot.

In addition, the earth revolves.

Speed also has an effect, the Earth's revolution speed is very fast when it passes perihelion, and it is slow when it passes aphelion. July is one of the hottest months of summer, but the Sun is the farthest from the Earth and the reason why the temperature does not drop is because of the Earth and the Solar System.

Each of the planets is the same, revolving around the Sun in its own elliptical orbit. Therefore, there is a point in orbit that is farthest from the Sun, called the Earth's "aphelion", and the closest (about 147.1 million km) to the Sun "perihelion".

The farthest day the Earth is from the Sun is July 14 or 15, but that day is not the hottest time for the Earth.

The heat of the earth is mainly influenced by the following factors:

1.The Earth's rotation from west to east around its axis of rotation rotates counterclockwise from the north pole and clockwise from the south pole.

The Earth's axis of rotation is angled to the ecliptic plane, perpendicular to the equatorial plane. The Earth's rotation is an important form of motion of the Earth, and it takes 23 hours and 56 minutes for the Earth to rotate in one cycle, and the rotation period increases or decreases by 3 thousandths to 4 thousandths of a second every 10 years.

2.The Earth's Male **The Earth revolves around the Sun while rotating in the direction of west to east, and the Earth revolves around the Sun in one year. For this reason, the length of day varies, and the temperature will definitely change as well.

Therefore, the reason why we feel hotter on the day when the Earth is furthest from the Sun, that is, on July 14 or 15, is not because it is farther from the Sun, but because of the influence of the Earth itself and its rotation.

In the Northern Hemisphere summer, the Earth is located near the aphelion of its orbit. But it's not that it's hot when you're far from the sun.

The Earth's orbit is an ellipse with a perihelion distance of about 100 million kilometers and an aphelion distance of about 100 million kilometers, a difference of about 5 million kilometers. However, the level of surface temperature has little to do with the change of distance from the sun, mainly the angle and time of sunlight hitting the ground.

The Earth's axis of rotation is tilted. In the summer of the Northern Hemisphere, the direct point of the sun is in the Northern Hemisphere, and the unit area of the Northern Hemisphere receives large sunlight energy and long sunshine hours, so the temperature is high, and it is summer. On the contrary, in the southern hemisphere, the sunlight is oblique, the sunlight energy received per unit area is less, and the sunshine hours are short, so the temperature is low, and it is winter.

At this time, the Earth is located near aphelion.

In the other half year, the earth moves to the other side of the orbit, and the tilt direction and angle of the axis of rotation remain unchanged, so that the sun shines directly into the southern hemisphere and obliquely on the northern hemisphere, and the temperature in the southern hemisphere is high and it is summer, and the temperature in the northern hemisphere is low, and it is winter. At this time, the Earth is near perihelion.

The Earth has an atmosphere that is used to keep warm, and the distance of 5 million kilometers changes too little compared to the average distance of 100 million kilometers to have an impact on the Earth's surface temperature.

Earth's orbit.

In summer, the earth is farther away from the sun, and in our northern hemisphere it is summer, and the temperature is higher and hotter.

During this period of time, the direct sun is located in the northern hemisphere, and the noon sun height is large in the northern hemisphere, the days are long, the solar radiation intensity is high, the solar radiation reaching the ground is more, the heat transferred to the atmosphere is more, and the temperature is high.

It sounds ironic that summer will be hotter away from the sun, just as water ice exists indefinitely in such a hot world, but it is actually perfectly understandable. This phenomenon can be explained by the fact that the Earth is actually very far away from the Sun, so the difference between its closest and longest distances has a negligible effect on the Earth's heat.

The closest point of the Earth to the Sun is negligible.

The reason that affects the temperature is the angle of refraction of light, and in summer the sun refracts at right angles, so it is hot.

The first thing to say is that the heat source of the atmosphere near the ground is the ground.

Solar energy is transmitted to the earth through radiation, but because the atmosphere is transparent, only a few small particles of dust scatter sunlight, and the atmosphere directly absorbs and converts very little solar energy. The ground is opaque, can directly absorb solar radiation and convert into heat, plus the ground material specific heat is small, so the temperature rises quickly, and then the ground temperature is higher than the atmospheric temperature, and the heat conduction to the near-ground atmosphere makes the atmosphere convection, so near the ground, the farther away from the ground, the colder.

This range is mainly within the troposphere of the atmosphere, which is the lowest layer of the atmosphere. Its height varies depending on latitude and season. The low latitude averages 17-18 km; The average in the middle latitudes is 10 12 km; High latitude only 8, 9 km.

For every 1000 meters of altitude, the temperature drops by about 6°

However, in the upper atmosphere, the ground is no longer used as a heat source, for example, in the stratosphere, about 20 km or more, and the temperature rises significantly with the increase of altitude, and an inversion layer appears. This is due to the fact that at an altitude of 20-25 km, the ozone content is the highest. Ozone absorbs large amounts of the sun's ultraviolet rays, which increases temperatures.

At an altitude of 300 km, the temperature in the thermosphere can reach more than 1,000 ......

If the sun is too high, the weather will be hot.

1. The sun. The Sun is a star located at the center of the solar system, and it is almost an ideal sphere intertwined with hot plasma and magnetic fields. The diameter of the Sun is about 1,392,000 (kilometers, equivalent to 109 times the diameter of the Earth; The volume is about 1.3 million times the number of liquid on Earth; Its mass is about 2 10 kilograms (330,000 times that of the Earth).

In terms of chemical composition, about three-quarters of the mass of the Sun is now hydrogen, and almost all of the rest is helium, including oxygen, carbon, neon, iron, and other heavy elements with less than 2% of the mass, which uses nuclear fusion to release light and heat into space.

2. The distance of the sun from the earth.

About 150 million kilometers is too far away, and the difference between the closest and farthest distance of the sun from the earth is only 5 million kilometers, so the distance between the sun and us has little to do with the weather.

3. The age of the sun.

The lifetime of the sun is about 10 billion years. There are mainly protostellar --- main-sequence stars--- red giants--- white dwarfs--- black dwarfs.