Why do solar eclipses occur on New Moons? What day of the lunar calendar does a solar eclipse occur

Reason: Because the necessary condition for a solar eclipse to occur: the Moon orbits between the Earth and the Sun for a solar eclipse to occur!

A new day is the date when the Moon moves between the Earth and the Sun!

1. Solar eclipses can only occur on the first day of the lunar calendar.

2. New day, that is, the moon and the sun are equal to the ecliptic longitude on that day, called the new day, the moon runs between the earth and the sun, and the sun haunts at the same time, and the moon cannot be seen on the earth.

3. The Chinese lunar calendar sets the New Year as the first day of each month, that is, the first day of the new year. "Saying": Shuo, the first day of the month.

The corresponding end of the month is called the day of the feast, and the moon is at its fullest day, which may be on the fifteenth or sixteenth day of the month. In the Tibetan calendar, the fifteenth day of each month is set as the day of hope, and the new day may be at the beginning of the month or the end of the month. The Islamic calendar now places the beginning of the new month as the first day of the month, and the new day is three or four days before the end of the month.

A solar eclipse must occur at the time of the new moon. (correct).

1. Basic introduction to solar eclipses:

A solar eclipse, also known as a solar eclipse, is the movement of the moon between the sun and the earth, if the three are exactly in a straight line, the moon will block the light of the sun to the earth, and the black shadow behind the moon falls on the earth, and the solar eclipse phenomenon occurs.

In folklore, this phenomenon is called the Tengu Eclipse Day. Solar eclipses only occur at the New Year, when the Moon and the Sun are conjunct. Solar eclipses are divided into partial solar eclipses, total solar eclipses, annular solar eclipses, and total annular eclipses.

You can't look directly at the sun when observing a solar eclipse, otherwise it will cause temporary blindness, and in severe cases, permanent blindness.

In 2016, there were two solar eclipses in Tianyu. The timing of the two eclipses is a total solar eclipse on March 9 and an annular solar eclipse on September 1.

2. Types of eclipses:

1. Total solar eclipse:

The Sun is 400 times wider than the Moon, but it is also 400 times farther away from the Earth. Because of the symmetry, the moon's shadow, the shadow that falls on the earth's surface, is just wide enough to cover the entire sun. The sun's photosphere is completely obscured by the moon, and the originally bright solar disk is obscured by a black lunar shadow.

However, it is only possible to observe the faint corona (coronal layer) with the naked eye when a total solar eclipse occurs.

2. Annular solar eclipse:

When the Moon is at apogee, the Moon's umbral cone cannot reach the Earth; What reaches Earth is a pseudo-umbra cone extended by a umbra cone. The apparent diameter of the Moon is slightly smaller than that of the Sun. As a result, the ball of light at the edge of the Sun is still visible, forming a bright ring around the Moon's shadow.

Outside the annular eclipse zone, the eclipse seen is a partial eclipse). The last annular solar eclipse occurred on May 10, 2013.

Both solar and lunar eclipses are formed due to the linear propagation of light. The Moon revolves around the Earth, and at the same time, the Earth revolves around the Sun with the Moon. Solar and lunar eclipses are the result of these two movements.

A solar eclipse occurs when the Moon turns halfway between the Earth and the Sun, and the three celestial bodies are in a straight line or near a straight line, and the Moon blocks the sun's rays.

In addition, when the Moon turns to the side of the Earth with the Sun on its back, and the three celestial bodies are in a straight line or close to a straight line, the Earth blocks the sun's rays, and a lunar eclipse occurs.

A solar eclipse is between the sun, the moon and the earth in the same straight line, the moon blocks the sun's rays, so that some places on the earth, even during the day, can not see the sun or only see the mutilated sun, the sun is completely covered is called a total solar eclipse, and the partially covered part is called a partial solar eclipse.

A lunar eclipse is a lunar eclipse in which the earth in the same straight line blocks the sun's rays, causing the moon to become black in a clear night sky.

Tools: a compass, a piece of white paper, a box of colored pens.

The steps are as follows: 1. First draw a circle with a compass on white paper, and then paint it yellow with a yellow color pen, which represents the sun, as shown in the figure below.

<>3. At a sufficient distance from the sun, make a smaller circle with a compass and paint it with a blue colored pen to represent the earth, and the center of this circle is over a horizontal white line, as shown in the figure below.

4. After that, use the compass to make a circle smaller than the earth, the position is between the earth and the sun, close to the earth, far from the sun, painted with gray colored pencils, indicating the moon, the circle of this circle is on the horizontal white line, as shown in the figure below.

5. Use an eraser to gently erase the horizontal white line, and then use a pen to mark "Sun", "Moon" and "Earth" on the three balls.

Finally, we have completed a schematic diagram of the position of the Sun, Earth, and Moon during a solar eclipse.

A solar eclipse is when the moon circles the earth and turns between the sun and the earth, if the sun, the moon, and the earth are exactly lined up or close to a straight line, the moon blocks the sunlight that shoots to the earth, and the black shadow behind the moon falls on the earth, and the solar eclipse phenomenon occurs. People in the shadow of the moon on the earth began to see the sun gradually weakening, the sun surface was obscured by a round black shadow, when the sky turned dark, all the brightest stars and planets could be seen in the sky, and after a few minutes, the sun gradually appeared from the edge of the moon's black shadow, and began to produce light and recircle.