Geography latitude and longitude lines morning and dusk lines What time is the intersection of the

Question 30: The earth rotates from west to east, so it enters the day from left to right. Therefore, in order for 1 place to be the first sunny spot, the morning line must be L4

Question 31: Subtract 117°40'e from 120°E to get 2°20' (converted to about 9 minutes), so when the sun rises at Haima Beach, Beijing time is 6:27 plus 9 minutes, which is 6:36... It will be a few minutes late until sunrise in Shitang Town, so only C is the most consistent.

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 consists of a morning line and a dusk line.

Question 30: Since both places are the first sunny spots, they are both located on the morning line, so it is more appropriate to choose L4.

Question 31: You don't need to calculate at all, you can reason about it. When a local sun shines on Haima Beach, it is 6 a.m. Beijing time

27。The longitude of Shitang Town is farther east than Beijing, so the time is earlier than Beijing time. Therefore, when there is sunlight in Shitang Town, it must be at 6:

After 27, the longitude between Beijing and Shitang Town is not much different, so the time difference is not very large, and C is the most appropriate.

30. In January, when the sun is in the southern hemisphere, the morning and dusk lines are perpendicular to the sun's rays, so d

31, the local time on the morning and dusk line is 6 o'clock, according to the formula can be calculated Beijing time.

Question 30: One or two places are the first sunny spots in our country, so L4 is the morning line.

Question 31: Shitang Town seems to be more than 120 degrees east longitude, in the east of Nansha, a few degrees worse, east plus west minus, it is more than ten minutes faster, the closest is item C.

I did this question when I was in high school, 30 is a d, 31 is a c

1. There are two intersections between the morning and dusk lines and the equator, and the places where these two points are located are always 6 o'clock and 18 o'clock. The morning line (day in the east and night in the west) and the intersection of the equator are at 6 o'clock, and the evening line (day in the west and night in the east) is at 18 o'clock at the meridian where the intersection of the equator is located.

2. Most of the parallels and the morning and dusk lines will form two intersections, and these two intersections will divide the parallels into two sections: the day arc and the night arc, of which the midpoint of the day arc is 12 o'clock when it is located at the meridian, and the midpoint of the night arc is 0 o'clock (24 o'clock) when it is located at the meridian.

3. In the polar day zone, there is a parallel, tangent to the morning and dusk line, and the place where this tangent is located is always 0 o'clock (24 o'clock).

4. In the polar night area, there is a parallels tangent to the morning and dusk lines, and the place where this tangent is located is always 12 o'clock.

Summary. Hello, the intersection of the morning line and the equator is 6:00 and the intersection of the evening line is 18:00.

Hello, the intersection of the morning line and the equator is 6:00 and the intersection of the dusk line is 18:00, I hope mine can help you.

Question 16: How to do it.

Hello, wait a minute, I'll read the title.

This topic is choose B.

What is parsing.

Wait a minute. The morning and dusk line is 0:00 or 12:00 at the o'clock, so Beijing is located in the eighth district of the east, according to the east and west to reduce the original lead, and the hunger can be calculated, and the Beijing time of Huaiju is 3 or 15 o'clock.

The first part of question 27, the answer plus analysis, is why it is done.

If the morning and dusk lines and the equator intersectWarpThe longitude is , then the longitude of the direct point of the sun is equal to 90° (the morning line is added to the east, and the evening line is subtracted to the west, i.e. the morning line is " " and the evening line is " ".

If the morning and dusk line with a certain oneWeftThe longitude of the tangent point, then the longitude of the point where the sun is directly exposed is equal to or 180°

Only the spring and autumn equinoxes are perpendicular to the morning and dusk lines, and the others are crossed. On the equator, the morning and dusk lines distinguish between 6:00 and 18:00. I hope you will adopt.

I'm a liberal arts student. It is difficult to describe in words, and you can sum up the experience by doing more questions and analyzing the answers yourself.

The morning and dusk lines on Earth are the dividing line between the day and night hemispheres on the Earth's surface.

The sun altitude is 0 on the morning and dusk line.

The morning and dusk line is a large circle, bisecting the Earth.

The blue line in the figure is the twilight line in the morning and dusk line.

The dividing line between the day and night hemispheres.

In fact, because the earth is in constant motion, the actual "morning and dusk line" is also constantly changing.

OK.

The direct point of the sun is located at 20°s. You can draw multiple rays of the sun on this side of the day, perpendicular to the morning and dusk lines (the line in the diagram is the morning line). Then you can measure the angle at which each of the sun's rays intersects with the rightmost meridian in the diagram (which bisects the day hemisphere at 12 o'clock local time), and you will see that the angle between the sun's rays and the 20°s latitude and that meridian is a right angle.

It can be understood this way.

In general, on the spring and autumn equinoxes, the morning and dusk lines coincide with the meridians, that is, the morning and dusk lines will pass the north and south poles. At any other time, the twilight line is oblique to the meridian (i.e., the twilight line does not pass through the north and south poles) and its angle range is 0 23°26. On the second solstice, its included angle is the largest, which is 23°26.

When the morning and dusk lines intersect the meridians, their angles are equal to the latitude values of the direct point of the sun at this time.

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Geography junior high school geography: a summary of longitude and latitude knowledge points.

1) Characteristics of weft: all wefts form a circle by themselves, called weft coils, the length of the weft coils is unequal, the longest is the equator, from the equator to the poles gradually shortened, to the poles shrink into a point. The parallels indicate the east-west direction, all parallel to each other, and the equator divides the earth into the northern and southern hemispheres.

2) The method of labeling latitude and the distribution and arrangement of latitude: latitude is calculated from the equator, the equator is set at 0 degrees, and the equator is divided into 90 degrees from the equator to the north pole and the south pole, and the north of the equator is the north latitude, and the code is n; To the south is the south latitude, the code is S, 90 degrees north latitude is the North Pole, and 90 degrees south latitude is the South Pole. The dividing line between southern and northern latitudes is the equator.

3) Special weft:

0 degrees of latitude: that is, the equator, is the longest parallel, the dividing line between the northern and southern hemispheres.

30 degrees of latitude: the dividing line between low and middle latitudes.

60 degrees latitude: the dividing line between middle and high latitudes.

90 degrees of latitude: that is, the north and south poles, 90 degrees north latitude is the north pole, and 90 degrees south latitude is the south pole.

Degree latitude: The Tropic of Cancer, which is the dividing line between the tropics and the temperate zone, and the dividing line between the phenomenon of direct sunlight and the phenomenon. The northern latitude is the Tropic of Cancer, and the southern latitude is the Tropic of Capricorn.

Degree latitude: The polar circle is the dividing line between the temperate zone and the cold zone, and there is the dividing line between the polar day and the polar night phenomenon. The northern latitude is the Arctic Circle, and the southern latitude is the Antarctic Circle.

4) See the direction of the Earth's rotation: The Earth rotates from west to east, and the direction of the arrow is east, and the opposite direction is west. Facing the map, go up to north, down to south, left west and right east.