Geography question: How to determine where the sun is based on date and time

Remember the dates of the 2nd equinox (spring and autumn equinox) and 2nd solstice (summer solstice, winter solstice), as well as the change in the position of the direct sun. Let's take a look at this by yourself or read the textbook, no.

A certain day in June is close to the summer solstice (June 22), so the direct sun point is near the Tropic of Cancer (not far to the south), the noon sun direction in the area north of the direct point is due south, and the direction of the sun is south (except for noon, it is due south, the rest of the time is southeast or southwest), and the noon sun direction in the area south of the direct point is due north.

The east-west is mainly judged by the morning and afternoon, and the sun rises in the east and sets in the west (in the general direction, not due east due west), so it is easterly in the morning and westerly in the afternoon. (That's basically the case, I won't analyze it if it's too complicated).

The analysis you mentioned, the location must be north of the direct point, so it will be afternoon at 16 o'clock, and it will be west-south.

1. The sun rises in the east and sets in the west, so judge things Look at the time For example, 16 o'clock is the afternoon, the sun is in your west, 8 o'clock is in your east, and the sun is no different from you at 12 o'clock.

2. The direct point of the sun moves between the Tropic of Cancer, so people north of the Tropic of Cancer, such as people at 35 degrees north latitude, see the sun always to the south of him. So the sun rises from the southeast and sets from the southwest, not from the east to the west.

Specifically, you still have to ask the teacher In the first chapter of high school geography, the teacher will explain.

Judging by key locations and key event nodes, such as: the position of the sun directly hitting the Tropic of Cancer or southerly in June

The first is the date, which determines the birth and setting of the sun; Then orient yourself according to the specific time.

The first picture:

coordinates of the direct sun point (23°26 N, 90°W); Beijing time is 2:00 a.m.

The second figure: 4) the coordinates of the direct sunlight point (0°, capacity 45°W); Beijing time is 23:00.

5) Coordinates of the direct sun point (23°26 s, 45°E); Beijing time is 17:00.

6) coordinates of the direct sun point (23°26 N, 90°E); Beijing time is 14:00.

When doing this kind of question:

First of all, you need to be familiar with the geographical outline, such as the three outline maps shown in the second map (the viewpoints are over the equator, the pole and the mid-latitudes, so that you have a model of the earth in your mind, which can be understood in combination with the globe);

Secondly, we need to grasp these basic concepts, for example: we can only see half of the earth, for example, in the second diagram (4), if we look above the equator, then we can only see 180 degrees of longitude, then we can divide into four squares, each of which spans 45 degrees of longitude; When looking at the pole, it is determined whether the pole is the south pole or the north pole; 12 o'clock at noon is the middle of the day; and so on.

Third, when doing the problem, complete the diagram as required, such as the first diagram, which is an abstract diagram, transform it into the form of (4) in the second diagram, and then add some content (such as the pole, the earth's rotation, the equator, the tropic of cancer, the polar circle, etc.).

The fourth step is to start working on the questions.

Date indicated: June 22, summer solstice.

Location of the direct sun point: Tropic of Capricorn,

l xiangzi's answer is correct and the analysis is also very careful.

Very good question, very careful observation.

and the true sun at the same time as the vernal and autumnal equinoxes;

Uniform motion; Circumnavigating the celestial equator.

This is the answer to the question, because the true solar time is not the same as the peaceful solar time, and the sun may not be in the middle of the sky at 12 o'clock. This discrepancy was not taken into account in the landlord's question, so it is easy to understand that there is an error of a few minutes. I believe this will make up for the three-minute microsecond gap.

It can be judged by the direction of the Earth's rotation. According to the direction of rotation, it is possible to determine which of the morning and dusk lines is the morning line and which is the dusk line.

The head of the earth turns from west to east, so that the western part of the morning line will move from night to dawn, and the eastern part of the dusk line will enter from day to night.

Geographic time can be calculated based on zone time, with each time zone varying by one hour, increasing from west to east and decreasing from east to west.

If you look at the picture, the meridian where the sun shines directly is at 12 o'clock, the morning line is at 6 o'clock, and the meridian is at 18 o'clock.

According to the overlap between the morning and dusk lines and the meridian in the figure, the date is judged to be March 21 or September 23, spring and autumn or autumn equinox.

In the spring and autumn equinoxes, the sun directly hits the equator and changes the void, so the latitude is 0 degrees of Sun J belt and then Lu; The direct point of the sun is 12 o'clock, the morning line is 6 o'clock, the prime meridian is 10 o'clock, and the longitude of 12 o'clock is 30 degrees east longitude. All combined, the direct point of the sun is 0,30e

The Earth's axis of rotation is tilted at 66°34 to its orbital plane, so the Sun will not shine on the North and South Poles at the same time.

Time is mainly related to longitude and has little to do with latitude, about sunrise and sunset time can be done by the following formula:

1.Sunset time + sunrise time = 24 hours.

2.Sunset time – sunrise time = day length.

3.(12 - sunrise time) 2 = day length.

4.(Sunrise time - 12) 2 = day length.

Your conditions are insufficient, and you lack the local longitude, otherwise you can use the time of the direct angle of the sun should establish a relationship for the local local time at 12 noon to establish a relationship for calculation, and the specific problem depends on whether there is hidden information in the map provided, for example, you can also determine the time of different longitudes according to the characteristics of the morning and dusk lines, determine the morning line and the dusk line, and you can also calculate and conclude according to the longitude spanned by the day arc 15 degrees = day length and then set the formula.