Hello, I want to learn geography about the morning and dusk line, will you?

Spring breeze and autumn wind are 6 o'clock at each latitude; On the summer solstice, it is 6 o'clock on the equator, and the time is earlier the north of the latitude, reaching 0 o'clock on the Arctic Circle, that is, the complete polar day phenomenon in the Arctic Circle, and the opposite is true when the equator is south, and the later the time is in the south, reaching 12 noon in the Antarctic Circle, and the complete polar night phenomenon in the Antarctic Circle; The winter solstice is the opposite of the summer solstice.

The dusk line refers to the fact that the area where a meridian line is located is from day to night, and at this time, the sun just sets from the horizon, so the sun altitude angle is also 0°. Since 12 o'clock in local time refers to the time of day when the solar altitude angle is at its highest, the length of the state from noon to dusk is always equal to the length of dawn to noon, i.e. 6--12--18, 5--12--19, 7--12--17

Wait a minute. The conclusion in the question is wrong, and it may be taken out of context, but it should be understood as: the morning and dusk line (poles) is 0:00 or 24:00

It should be the ** meridian of the night hemisphere, and the height of the sun at 12 o'clock can be 0 degrees (polar night zone).

The local time on the morning line is 0-12 o'clock, the place on the dusk line is 12-24 o'clock, and the time on the morning (dusk) line is 5:30 on the place A, indicating that the P line is the morning line.

The P line is the morning line, then the west (left) side of the P line is night, the east (right) side is day, the north (upper) day is shorter and the night is longer, indicating that the direct sun is in the southern hemisphere, at this time, the day is short and the night is long in the northern hemisphere, and the day is long and the night is short in the southern hemisphere; If place A is on the morning line, that is, at sunrise at 5:30 a.m., then the day length and night are short in place A, indicating that place A is in the Southern Hemisphere.

The answer is: b Morning line, Southern Hemisphere.

To put it simply, because the earth is an opaque entity, the sun's rays can only illuminate the side facing the sun, and the boundary between day and night is the morning and dusk line.

Features of the morning and dusk lines.

1) If the Earth is regarded as a positive sphere, and the scattering of the sun's rays by the atmosphere is not considered, then the area of the day and night hemispheres on the Earth should be equal, that is, the morning and dusk circles are a great circle through the center of the sphere, and the Earth is equally divided.

2) The plane of the morning and dusk line is perpendicular to the sunlight. The solar height at each point on the morning and dusk line is 0, the solar height at each point in the day hemisphere is greater than 0, and the solar height at each point in the night hemisphere is less than 0.

3) The morning and dusk lines are always bisected at the equator.

4) The morning and dusk lines coincide with the meridian coil only at the spring and autumn equinoxes.

5) The morning and dusk lines are tangent to the polar circle at the summer and winter solstices.

6) The morning and dusk line moves 15° hours from east to west, opposite to the direction of the Earth's rotation.

1. Only the local time at the intersection of the equator and the morning and dusk lines is 6 o'clock or 18 o'clock. If it is the morning line, it is 6 o'clock, and the evening line is 18 o'clock.

2. The altitude angle of the sun at noon = 90°- (the difference between the latitude of the point and the latitude of the direct point), so you can find the other if you know that any two of them.

3. Sunrise and sunset are the sun height angle is small, so the shadow is the longest of the day, and the sun height is the largest at noon, so the shadow is the shortest of the day.

It is best to do it in combination with map questions that will make you more impressed.

I'm talking about the reading methods I learned in high school.

1.The morning and dusk lines are half of the morning and dusk circles. When the earth enters the day through the morning and dusk circle from west to east, the line it passes through is called the morning line; When passing through the morning and dusk circle into the night, the line passed through is called the dusk line.

2.Obviously, in order to correctly distinguish between the morning and dusk lines, it is necessary to first specify the direction of rotation of the Earth as shown in the given diagram.

3.In a normal lighting map, the shaded part usually represents the night!

To put it simply, the morning line from night to day is the morning line, and vice versa. Interpret it in the direction of the Earth's rotation.