The direction in which the total solar eclipse belt moves on Earth

Classmate, I like your question.

Analyzing this problem in terms of angular velocity is indeed wonderful!

Let me answer your questions!

You are quite right, the earth rotates from west to east, and the angular velocity of its rotation per hour is 15 degrees.

The moon revolves around the earth from west to east, and the sky revolves around the earth once in the sky, so that it is calculated as an hour's rotation of about degrees.

However, from the point of view of people on Earth, there is a little bit of change.

We see that the sun and moon rise in the east and set in the west because the earth rotates 15 degrees per hour.

The Sun can be considered to be in motion, so the Sun rotates 15 degrees per hour to east to west.

The Moon's east-to-west rotation (the angular velocity of the Earth minus the angular velocity of the Moon).

So when in the sky, the angular velocity of the sun is greater than that of the moon, so that a total solar eclipse is possible, otherwise how can the sun catch up with the moon?

People often subjectively believe that it is the moon that moves above the sun and obscures the sun, but in fact, the sun catches up with the moon and is then obscured by the moon.

Okay, now for your question, at the beginning, the sun and the moon are both in the easternmost direction, but the angle difference between the two is very large (the moon rises higher), so the shadow of the moon will shoot very obliquely to the west of the earth. At this point in the western shadow, the sun and the moon are in a straight line. So there will be a total solar eclipse in the west first.

Then, as the sun catches up with the moon, they rise from the east, and the projection slowly moves eastward.

Later, as the moon overtakes the sun, the two slowly move to the western sky, and the shadow accelerates to the east.

The speed of the shadow is very fast at first (because the shadow is too tilted), then it slows down (slowly vertical), and then it becomes faster (it is tilted again)!

As for the speed of the moon's shadow that many people explain that the speed of the earth's rotation is faster, it is actually wrong, and it should be analyzed by angular velocity.

You missed the speed at which the Earth orbits the Sun.

--- the White Path (the Moon's orbit around the Earth)!

From west to east! Geography First through India, and then to China.

The orbital plane of the Moon and the orbital plane of the Earth do not coincide, and have an angle of about 5 degrees and 9 minutes. So not every lunar month there will be a solar and lunar eclipse. A solar or lunar eclipse occurs only when the Moon is on the same straight line as the Sun and the Earth, and the Moon is near the intersection of the two planes.

Because the distance between the Moon and the intersection of the two planes is not fixed during each eclipse, and the angle caused by the Earth's rotation is not fixed, the location of the eclipse belt on the Earth is not fixed.

The white path is the projection of the plane of the Moon's orbit on the celestial sphere. Do not spare the earth to turn. However, in the observer's opinion, the trajectory of the white channel on the celestial sphere is not fixed because the angle between the white channel and the ground plane is not fixed.

The Saros cycle is a cycle of solar and lunar eclipses with 223 synodic months. The eclipse and lunar eclipse repeat once after each synodic month.

The calculation of specific solar and lunar eclipses requires knowledge of celestial mechanics, which ordinary people do not know.

To put it simply, you can think so.

The Moon orbits the Earth from west to east, so the Moon obscures the Sun from west to east during a solar eclipse, and people see that the first eclipse always occurs on the west side of the Sun surface. At the same time, the moon's umbral cone (total solar eclipse) or pseudo-umbral cone (annular solar eclipse) sweeps across the Earth from west to east, faster than the Earth's rotation.

Due to the solar eclipse, the moon's orbital period is synodic moon, the earth's rotation period is a mean solar day, and the average distance between the moon and the earth is 38,500 kilometers. The Moon umbra cone moves at a speed of 38,500 km*2* ( = 3,413 km, while the Earth's rotation at the equator is 40,000 km/h 24=1,667 km. Shadow shifts faster than rotation, so for most central eclipses, the eclipse zone moves from west to east, meaning that the observer from the west sees the eclipse before the east one.

In the central solar eclipse that occurs in the polar regions, the moon shadow cone projection is more complex, and sometimes the eclipse zone will appear in a west-east-west or east-west-east direction, such as the annular solar eclipse on January 26, 1990 and the total solar eclipse on November 23, 2003. It may be found that if you look at the earth from north to south in space, the movement of the lunar shadow cone on the earth's surface is counterclockwise, that is, the right-hand spiral, which is consistent with the direction of the moon's revolution around the earth. Whether it is in the middle and low latitudes or in the polar regions, the direction of the central food belt is counterclockwise.