What is the mid equinox of the day hemisphere, the dividing line between the day hemisphere and the

The median equinox of the diurnal hemisphere is the middle meridian of the diurnal hemisphere, and it is 12 o'clock when the sun hits this meridian, that is, the place of this meridian!

In the same way, the mid-meridian of the night hemisphere is also the middle meridian of the night hemisphere, and the place of this meridian is 0 or 24 o'clock!

The bisector of the day hemisphere is the meridian corresponding to 12 o'clock local time. The degree of this meridian is the longitude of the point where the sun is directly exposed.

You take a globe (or sphere) and shine it with a flashlight! A flashlight equals the sun!

It can only illuminate half of the ball, that is to say, half is night and half is day, and the line that separates night from day is called"Morning equinox"!That's what you're talking about!

The dividing line between the day and night hemispheres is the morning and dusk line, or the circle of morning and dusk, to which the sunlight is always at an angle of 90°. The morning and dusk circle divides the weft coil through which it passes into day arc and night arc, and the length of the day arc and night arc can indicate the length of day and night of the weft coil. Spring and autumn equinoxes, the global day and night are of equal length; On the second solstice of winter and summer, it has the largest angle with the meridian, and the difference between the length of day and night in the world is the largest, and it is actually slightly smaller than the large circle due to the refractive effect of the atmosphere and the existence of the apparent radius of the sun.

Morning and dusk line and solar terms and direct sun spots:

If the morning and dusk line passes through the pole and coincides with a meridian coil, the solar terms are spring and autumn equinoxes, and the sun directly hits the equator, if the morning and dusk line is tangent to the polar circle, that is, the angle with the earth's axis is the largest, and there are two situations: one is the Arctic Circle and the north is the polar day, then it is the summer solstice, and the sun directly hits the Tropic of Capricorn; The second is the Arctic Circle and the polar night north of it, which is the winter solstice, and the sun shines directly on the Tropic of Capricorn.

The dividing line between the day hemisphere and the night hemisphere is the morning and dusk line. The morning and dusk line, or the morning and dusk circle, refers to the dividing line between the day and night hemispheres on the earth, and is the great circle of the earth. The morning and dusk circle divides the weft limb coil through which it passes into day arc and night arc, and the length of the day arc and night arc can indicate the length of day and night of the weft coil.

Since the earth is constantly rotating in a solar day cycle, the morning and dusk circles are constantly moving on the ground, and its cycle is also one solar day (24 hours), resulting in the phenomenon of day and night. Since the Earth is an illuminated, opaque sphere, the Sun can only illuminate half of the Earth at any one time. The hemisphere facing the sun is day (day hemisphere), and the hemisphere facing away from the sun is night (night hemisphere).

The dividing line (circle) between the day and night hemispheres is called the morning and dusk line (circle). It is composed of the morning line and the dusk line. The boundary from day to night is the dusk line, and the boundary from night to day is the morning line.

If the morning and dusk lines pass through the poles and coincide with a certain meridian coil, the solar terms are spring and autumn equinoxes, and the sun shines directly on the equator; If the morning and dusk line is tangent to the polar circle, that is, the angle with the earth's axis is the largest, there are two situations: one is the Arctic circle and the north is the polar day, then it is the summer solstice, and the sun directly hits the Tropic of Capricorn; The second is the Arctic Circle and the polar night north of it, which is the winter solstice, and the sun shines directly on the Tropic of Capricorn.

The meridian of the outermost circle of the day hemisphere in the side view is the boundary of the bisecting day hemisphere, and the local time is 12 o'clock.

In the polar center of the diagram, the meridian parallel to the sunlight in the diurnal hemisphere is the boundary that bisects the diurnal hemisphere, and the meridian where point A is located in the diagram.

The dividing line between day and night is also known as the morning and dusk line. The morning and dusk line is the morning calendar rolling circle, which refers to the dividing line between the day and night hemispheres on the earth, and is the great circle of the earth. In the equinox, it coincides with the same meridian coil, and the global day and night are of equal length; On the second solstice of winter and summer, it has the largest limb surplus at the intersection angle of the meridian, and the difference between the length of day and night is the largest in the world.

Due to atmospheric refraction and the presence of the apparent radius of the Sun, it is actually slightly smaller than the Great Circle.

20 degrees west longitude and 160 degrees east longitude. 20 west longitude east to 160 east longitude is the eastern hemisphere. The eastern hemisphere is 160 degrees east to 20 degrees west longitude.

The earth is an opaque, non-digging, high-lighted sphere, and the sun can only illuminate half of the earth at any one time. The half of the Earth illuminated by the sun is called the day hemisphere.