The sun moves a few degrees per minute, with the horizon as the standard

On the background of the entire celestial sphere, the sun runs one day a year, about 30 degrees per month, that is, it moves about 1 degree per day, but because the year is actually a day, the daily movement of the sun should be close to 1 degree and less than 1 degree, as for the degree of movement per hour, it can only be calculated in minutes. 60÷24

The change in the apparent position of the Sun is only related to the orbit of the Earth's orbit in the square cavity, and has nothing to do with the north and south, and from the perspective of the whole Earth, the Sun moves about 1 degree per day.

If you ask about the change in the position of the sun rising in the east and setting in the west every day, this is also fixed, there is no question of fast and slow, the sun is a week every day, plus 1 degree of apparent motion advancement, so the sleepiness should be 361 degrees every day, you can get it with 361 24, which is about 15 degrees per hour.

I don't know if mine is what you want to ask, if so, add some points!

In terms of the apparent motion of the sun, the movement of the sun in the sky is a direct reflection of the rotation of the earth.

The Earth rotates once every 24 hours and is 360 degrees. Then the angle at which the sun moves in the sky per hour is 360 24 = 15. That is, the sun moves 15 degrees in the sky every hour.

360 divided by 24 hours, 15 degrees per hour.

The movement of the sun on this day is in the order of (b — a — b — pairs.

c．②—d．①—

The sun is at its lowest and tangent to the horizon, indicating that there was a polar day phenomenon that happened to occur on that day.

The sun rises in the east, and it should rise from the east of the picture; In the picture, it rises from the north, so it does not rise from the east.

Since it is the apparent motion of the sun, that is, you can see the sun moving in the sky, and you can see that the sun can be seen here all day, and it is the polar day. The sun really rises in the east only for two days of the spring and autumn equinoxes.

There are two main influencing factors:1Latitude of the observation point 2The declination of the sun.

At the spring and autumn equinoxes, the sunset of the Sun at the equator is the shortest: it is the circle of the Sun) minutes) = 2 minutes.

It becomes longer with the change of latitude and the change of the declination of the sun, and the value is 2 minutes [cos (latitude of the observation point) * cos (declination of the sun)]. The former causes the angle between the trajectory and the horizon circle to decrease when the sun sets, and the latter causes the linear velocity of the sun's sun's movement to slow down. During the summer and winter solstices in Shanghai, it takes about 3 minutes for the sun to set completely, which is still a lot longer than the equator, right?

Naturally, there are other influencing factors, such as the eccentricity of the Earth's orbit and the annual motion of the Sun. However, the impact is much smaller in comparison, so it is simply ignored.

This is the sunrise and sunset time, which varies from day to day, with different seasons and greater differences, with the winter solstice being the shortest and the summer solstice being the longest. The exact length of each day needs to be checked in the sunrise and sunset schedule, or through complex calculations.

The figure shows a schematic diagram of the apparent movement trajectory of the sun in a certain place (70°N) in one day, just when the polar day occurs, the latitude of the direct solar point and the latitude of the polar day are mutually reciprocated, and the latitude of the direct solar point is 20°N; When the sun moves to its position at 6:00 a.m. Beijing time, the local time is 12 o'clock, and the longitude of the direct point of the sun is 150° W according to the "east morning and west evening, east plus west minus".

Therefore, a

When the highest point in the solar apparent motion is at 12 o'clock local time, that is, at point A in the figure, the local time of longitude is 12 o'clock, and at this time, Beijing time is 6 o'clock, that is, the longitude of 120 degrees east longitude is 6 o'clock, and the longitude difference between the time and the time is 12 o'clock by 6 hours, a difference of 90 degrees of longitude, and 90 degrees of longitude to the east, that is, 150 degrees of west longitude.

At this time, the polar day phenomenon occurs at the observation point, that is, the polar day phenomenon has just occurred, because the lowest point of the sun's trajectory is on the horizon, and it is the northernmost part. Therefore, the direct point of the sun is more than the latitude of the location, and the direct point of the sun is in the same hemisphere as the location. According to the noon sun altitude angle formula:

90-(x-y)=46 and x+y=90 give x=23, that is, the latitude of the direct sun point is 23° north latitude (where x represents the latitude of the direct sun point and y represents the latitude of the location).

Morning: The red sun is on the horizon looking at the world that has just woken up from its slumber, and he sees the eyes of hope and the steps of expectation, and sprinkles his blessings with golden light.

Evening: Before I knew it, the sun had passed another day, watching the nostalgic afterglow turn the surrounding clouds red, like a maple forest in autumn, and the sun was the most dazzling leaf.