What time of day is the Sun closest to the Earth and why?

The answers upstairs seem to be correct, but they ignore the fact that the earth is a volumetric shape, and the earth is not a "mass point". And if you consider that it's a ball. Theoretically, noon is the closest, and midnight is farthest. It can be approximated by the following formula:

l is the distance from the sun to the center of the earth, r is the radius of the earth, l'is the actual distance from the sun at a certain time in a certain place) noon: l'=l-r

Midnight: l'=l+r

Of course, this is only theoretical. Because r is so small compared to l, it's not really that different. But there's always a bit of a difference.

In addition, the distance between the Sun and the Earth varies greatly throughout the year. The winter solstice is the closest and the summer solstice is the farthest.

There is no answer. The nearest should be the closest distance between the center of the sun and the center of the earth. There is no such thing as a "day in a day".

Suppose there is a time of day that is the closest, then for different places on the earth, some are morning, some are midnight, and some are afternoon, so there is no answer.

The upstairs and the fifth-floor are very classic

If it's somewhere on Earth and somewhere on the Sun, there's no answer, because at the same time on Earth, somewhere is morning and somewhere is night

As for looking at the Earth and the Sun as two masses, what I'm going to say is all that I'm going to say upstairs, and it's perfect

During the day, the Sun is close to the Earth.

During the year, the Sun is closest to Earth in early January and farthest from Earth in early July.

During the day, at 12 noon, the Sun is close to the Earth.

Of the year, the sun is closest to the earth on the summer solstice, and the sun is furthest from the earth on the winter solstice.

Introduction: Sun-Earth distance is also known as solar distance. Refers to the length of the straight line from heliocentric to geocentric.

Since the Earth's orbit around the Sun is an ellipse and the Sun is at a focal point, this distance varies. Its maximum is 152.1 million km (the Earth is at aphelion); The minimum is 147.1 million km (the Earth is at perihelion); The average is 149.6 million kilometres; This is an astronomical unit, which was established by the International Astronomical Union in 1976 as 149597870 kilometers and has been in use since 1984. At this distance, it takes only 8 minutes and 18 seconds for sunlight to reach the Earth's surface.

One light-year is equal to 63,240 astronomical units. One light-year is equal to 9,460,730,472,580,800 meters (exactly), or approximately equal to meters = patameters. Light travels about 300,000 kilometers per second, 18 million kilometers per minute, and 8 light minutes is about a light year, and 18 light seconds is about a light year.

Light-year is a unit that measures the space-time distance between celestial bodies, and is generally used to measure the space-time distance between celestial bodies, which literally refers to the distance of light traveling in a straight line in the cosmic vacuum for one year, which is 9 460 730 472 kilometers, which is calculated from time and the speed of light.

The closest time of the day the Earth is to the Sun is 12 noon, and the farthest time is in the early morning. The closest time of the year the Earth is to the Sun is January, and the farthest is July.

1. The closest time of the day to the sun is 12 noon, and the farthest time is early in the morning.

The Earth's rotation from west to east produces a day-night alternation, which is closer to the Sun when it is daytime and farther away from the Sun when it is night. But the change in distance is minimal. Because the earth is rotating and revolving at the same time.

If the Earth is completely stationary, the area in the middle hour is closer to the Sun than the area in the morning hour.

However, the earth is not completely stationary, but is in a constant rotation and revolution, so the distance of the sun from the observer is related to the shape of the earth, the latitude of the earth, the time of sunrise, the slow change of the direction of the earth's axis of rotation and the influence of the gravitational force of the planets on the earth's orbit, but the change in this distance is much smaller than the straight-line distance of the sun and the earth, and the impact is minimal.

2. The closest time of the year to the Sun is January, and the farthest is July.

The Earth's orbit around the Sun is roughly an ellipse, and its long and short diameters are not much different. The sun is at one of the focal points of this ellipse, and the focus is not in the center of the ellipse, so the distance between the earth and the sun is sometimes a little closer, sometimes a little farther away. When you are closest to the Sun, this point is called perihelion.

The farthest point from the Sun is called the aphelion.

At the beginning of January, the Earth is closest to the Sun, 100 million kilometers, which is called perihelion. At the beginning of July, the farthest point of the Earth from the Sun, which is 100 million kilometers, is called aphelion.

The closest Sun is to the Earth around January 4 every year.

The distance from the sun to the earth varies throughout the year, with winter (summer for the Southern Hemisphere) being closer and summer farther away. Because the earth passes the perihelion in the elliptical orbit around January 4 every year, the distance between the Sun and the Earth is the closest; Half a year later, the distance between the sun and the earth is the farthest, and the difference between the two is about 5 million kilometers.

The closest the Sun is to Earth should be the day of the summer solstice.

The Earth's orbit is not completely circular, so the distance between the Earth and the Sun varies. According to the observations and calculations of astronomers, the closest day to the Sun is around January 2 every year, which is called the Earth's perihelion. Correspondingly, the farthest day from the Sun is around July 3 every year, which is known as the aphelion of the Cave Sphere.