For masters of physical geography, please enter the Yellow and Red Corners, and the earth rotates

The first question: these two angles do not change in the short term The yellow-red angle is actually the angle of the Earth's orbit and the equator Because you should know that astronomical numbers do not change in the short term The second question: The yellow-red angle is 22 degrees 26 minutes The third question:

The morning and evening lines coincide with the meridians only on the day of the spring and autumn equinoxes, and although they always form a circle to bisect the earth, only those two days can calculate the longitude and Thank you.

In a period of thousands of years, tens of thousands of years or even longer, the angle of intersection of the Earth's axis and the plane of the ecliptic, as well as the angle of the yellow and ecliptic, can be regarded as constant, but if they are in a period of hundreds of millions of years, they will change significantly.

There is also the intersection angle of the earth's axis and the ecliptic plane, and the sum of the intersection angle of the yellow and red is always 90 degrees, and the yellow and red intersection angle is 23 degrees and 26 minutes;

The morning and dusk lines always form a circle and divide the earth; It is only at the spring and autumn equinoxes that the morning and dusk lines coincide with the meridians, and if the east and west meridians are not taken into account, the sum of their longitudes is always equal to 180 degrees.

The two angles of 66 degrees 34 minutes and 23 degrees 26 minutes remain unchanged for a certain period of time. And the yellow and red corners are 23 degrees and 26 minutes.

The morning and dusk lines always form a circle and divide the earth;

The morning and dusk lines and the meridians are obliquely intersected, and the two meridians intersect on the equator, and the sum of the longitudes of these two meridians is equal to 180 degrees, and only at the spring and autumn equinoxes, the morning and dusk lines coincide with the meridians, and the sum of the longitudes of the two meridians is always equal to 180 degrees.

Question CWhen the angle of the yellow and equator becomes 0, the sun shines directly on the equator all year round, and the day and night are equinoxical throughout the year, and there is no seasonal change in the height of the sun at noon in various places, so there is no seasonal change in various places. However, there is a change in the height of the sun throughout the day, so there is still a diurnal variation in temperature.

The Earth's axis of rotation is tilted at 66°34 from the orbital plane of its revolution. This angle is similar to the tilt of the barrel of a pencil to the table when writing with a pencil. It is sometimes vividly compared to the Earth's "diagonal body" orbiting the Sun.

This relationship between the rotation of the Earth and its revolution is usually expressed in astronomy and geography by its co-angle (23°26), i.e., the angle of intersection between the equatorial plane and the orbital plane; On the geocentric celestial sphere, it is manifested as the intersection angle of the ecliptic and the celestial equator, and is called the intersection angle of the yellow and red equator, also known as"Yellow red large distance"。The two nodes of the ecliptic and the celestial equator, called the first point of the Aries house (Aries) and the first point of the Libra house (Libra), are called the spring equinox and the autumn equinox respectively in the northern hemisphere, and are collectively called the equinox. The two farthest points on the ecliptic from the celestial equator are called the first point of the Cancer house (Cancer) and the first point of the Capricorn house (Capricorn), that is, the summer solstice and winter solstice points in the northern hemisphere, collectively called the second solstice.

The second solstice is 23°26 away from the celestial equator, which is called the great elongation of the yellow and the red sky, which is the manifestation of the intersection of the yellow horns on the geocentric celestial sphere.

The yellow-red angle on the celestial sphere also shows the deviation of the north and south celestial poles from the north and south yellow poles. The celestial axis is perpendicular to the equatorial plane, and the yellow axis is perpendicular to the ecliptic plane, since the yellow-ecliptic angle is 23°26, then, the deviation of the celestial pole from the ecliptic pole must also be 23°26.

The existence of the yellow-red angle is of great astronomical and geographical significance. As mentioned above, the yellow-red angle is one of the causes of the precession of the earth's axis. It is also the main reason for the annual variation in the length of the solar day. In the next section, we will also explain that the yellow-red angle is the root cause of the change of the four seasons and the distinction of the five zones on the earth.

This relationship between the rotation of the Earth and its revolution is usually expressed in astronomy and geography by its co-angle (23°26), i.e., the angle of intersection between the equatorial plane and the orbital plane; On the geocentric celestial sphere, it is represented as the intersection of the ecliptic and the celestial equator, and is called the intersection of the yellow and red equators.

If the angle of yellow-red intersection changes from the current 23°26 to 23°, what will be the effect on the cycle of the return year? What is the impact on the number of days of polar day and polar night in the polar regions? I discussed with my colleagues for a long time, but I didn't form a unified opinion! Looking forward to the guidance of all colleagues! Thank you.

The spatial orientation of the Earth's axis is fixed, which makes the Earth's orbital plane, that is, the ecliptic plane and the equatorial plane, have an angle between the ecliptic plane, which is the yellow-red intersection angle.

The angle of inclination of the earth is equal to the angle of yellow-red junction.

Answer C: This question examines the movement of the earth. If the angle of the yellow equatorial intersection is 0°, the direct point of the sun is always located at the equator, so the equatorial region takes the source to burn the heat, and the polar region is cold and cracked, so it is also known that the void will form a regular atmospheric circulation. Therefore, item C is selected.

a. A is located near perihelion, and the earth rotates at the fastest speed; Point B is close to perihelion, and the earth's orbital speed is faster, and the rotation speed of the two is greater than that of B, so it does not conform to the topic;

b. The two points of A and B are symmetrical about the winter solstice, A moves to the north, B moves to the south, and the change trend of day length in the same place is different, so it does not meet the theme;

c. A is located near perihelion, and point B is close to perihelion, and the distance between the sun and the earth is different, so it does not conform to the topic;

d. The two points of A and B are symmetrical about the winter solstice, the position of the direct sun point is the same, and the sunrise direction of the same place is the same, so it is correct

Therefore, d

35°n；Tropical, boreal zone.

When the angle of yellow-red intersection becomes 35°, the Tropic of Cancer becomes 35°S and 35°N, and the Arctic and Antarctic Circles become 55°S and 55°N.