Someone starts from the equator and walks 90 kilometers to south, east, north, and west until they a

cEast of the point of departure.

Let this person be a point, the origin is 40 km north of the Northern Hemisphere, and after traveling 100 km south, this point is 60 km south of the Southern Hemisphere (since the north and south of the earth can be regarded as symmetrical, the origin is 40 km north of the equator, and this point is 60 km south of the equator, so it is concluded that this point is higher than the latitude of the origin).Going 100 kilometers due east and then 100 kilometers due north, the key is to go west, where the latitude is lower than when going east, so the same 100 kilometers will have a greater longitude to the east, and a smaller longitude to the west, but if you want to return to the starting point, you have to go west for a while. That's where the difference is

The headache, because the length of the longitude and the length of the latitude is different, should be to the east, to the north and south regardless of him, because that latitude has not changed, the first time to the east, so it is in the east.

This is like a rule, and you can understand it by walking around on October 1.

And I didn't say that I should consider the rotation of the earth!!

aWhat does this have to do with speed and latitude and longitude? There are no edges.

If you want to think about it, then his question must be wrong, maybe the distance he walked is not 90 kilometers.

I guess it's a geography question.

I guess his test point should be: the earth rotates from west to east.

In this question, we should consider that the speed of the earth's rotation from west to east is set to v1 km h, and the speed of a person is v2 km h, which is obviously faster for a person.

When going south and north, it is synchronized with the earth in the east-west direction, and there is no relative displacement in the east-west direction; However, when going east and west, the east-west direction and the earth are not synchronized, which is produced by relative displacement, the eastward and westward movement time is 90 v1, but the actual distance to the east is 90 v1 * v1+v2), and the actual distance to the west is 90 v1 * v1-v2), it is obvious that the opposite distance to the south and north is equal, and the distance to the east is greater than the distance to the west, so the end is east of the starting point.

It is best to use the starting point as a static reference point for this question. It's not hard to understand.

cBecause the length of the latitude is not the same, the equator is the longest, decreasing towards the poles. Originally, if it was equal, then it was at the starting point. It can be because it is not equal, so it will be to the west of the starting point.

Simply draw a diagram and you'll understand.

Don't mislead the students upstairs, yours is completely wrong, and the question doesn't take into account the rotation of the earth at all. Press the upper north, lower south, left west, right east and draw on the paper to know that it is just enclosed into a square with a side length of 90 kilometers.

Junior high school geography! I like it!

This question is only related to the latitude and longitude, and it has nothing to do with the rotation and speed!

c。From point A of the equator, walk 90 kilometers south to point B. Continue 90 km west to point C.

Head another 90 km north to point D. Since the distance between ab and cd both refers to the meridian and there is no difference, ab=cd. 90 km east from point D, assuming you reach E.

The diagram above is south).

.b 11111 c

.a 1...e-11-11 d

It's clear! Got it?

A has so many pirated books now, C is certainly not right.

The last is located west of the point of departure b, because it is not only but also peanut and rice.

It stands to reason that the earth is so large that tens of kilometers should be ignored, but since it is a geographical problem, it is necessary to consider that the earth is round, so the longitude spanned by walking 1 kilometer at high latitudes is more than that at low latitudes, that is to say, high latitudes go faster than low latitudes in the east-west direction.

So when this person goes 100 kilometers to the south, he reaches 60 kilometers south of the equator, which is higher than the latitude just now (40 kilometers north latitude, 60 kilometers south latitude, a bit awkward), so it is faster to go 100 kilometers east than to go back to the northern hemisphere and go west, so in the end it should be east of the starting point, choose d.

This person is located directly west of the starting point.

Required rule: All meridian lengths are equal, and the same 100-meter meridian arc length corresponds to equal radians. In the same hemisphere, the length of the parallels decreases from the equator to the poles, and the length of the arc of the parallels of the same 100 meters, the higher the latitude, the greater the corresponding radian.

The reason is that this person is located 40 kilometers north of the equator when he set out, and he first walks 100 meters south along the meridian, on the one hand, he is still in the Northern Hemisphere (100 < 40 kilometers), and on the other hand, he is now at a lower latitude, and the corresponding latitude coil is longer; The person then walks 100 meters east along the parallel, and the corresponding arc is denoted by a; The man then walked another 100 meters north along the meridian and returned to the latitude on which he had set out; Finally, the person walks 100 meters west along the latitude, due to the higher latitude, the arc length of the 100-meter latitude corresponds to a larger radian, the corresponding arc is b, and b > a, the person will pass through the starting point (at this time has walked through the radian a, return to the original place, but the distance of 100 meters has not been reached), and arrive at a place west of the point.

This person is located due east of the starting point. Here's the process:

A person starts from "A" 40km north of the equator and walks 100m south for the first time to "B", at this time the person is 60km south of the equator, then walks 100km east to "C", and then 100km east to "D", at this time "D" and "A" are on the same parallel, that is, 40km north of the equator, according to the law that the farther away from the equator, the shorter the parallel"a、d"The parallels where it is located are longer than the parallels where "b" is located, so d is located due east of a.

Because of all the parallels, the equator is the longest. For the same distance (1000 meters), the longitude spanned at the equator is certainly shorter than the longitude spanned on other parallels. And if you go due south and due north, you must follow the meridian.

If you walk 1,000 meters on the equator with a span of 5°, then after walking 1,000 meters in the direction of due south, the longitude spanned by walking 1,000 meters due west on the latitude line must be greater than 5°, and then walking 1,000 meters along this meridian (the distance is the same as that of due south) must be due west of the original starting point.

The equator is the longest latitude, 1,000 meters due east on the equator, 1,000 meters due south, 1,000 meters west of the latitude of south latitude, and then 1,000 meters due south back to the equator. The equator is the longest parallel, spanning less longitude due east than due west, so it ends up back west of the starting point.

Because it's not the equator when you go west, you take an egg and think it as the earth, and start drawing centimeters in the direction of the southeast and northwest at the equator.

From 40 km north of the equator to the south to the equator, the length of the latitude becomes longer, and from the equator to the south of the latitude becomes shorter Walk 100 km north of the equator to the south and reach 60 km south of the equator, where the length of the latitude is shorter than the latitude 40 km north of the equator, so from 40 km north of the equator to due south, east, north, and west for 100 km, and finally to the east of the starting point

Therefore, d

East of the departure point.

It's very simple, because the earth is equivalent to a sphere, the circumference of the equator is the largest, and it gradually decreases towards the poles, and it will return to the equator after going a hundred kilometers to the north and south, but the east and west will be different, and you can ask me again if you don't understand.

Departure point due east.

The Earth can be seen as a sphere, slightly bulging in the middle and slightly flattened at the poles.

The meridians are of equal length, but the length of the parallels varies, with the equator being the longest coil of latitude and decreasing in length towards the poles.

For every 1 degree difference in latitude, the distance difference is 111 kilometers; Only the equatorial region has a distance difference of 111 kilometers for every 1 degree of longitude, and the distance difference of 1 degree in other latitudes is less than 111 kilometers, and the distance is smaller towards the poles.

From the equator, 100 kilometers due west is equivalent to nearly 1 degree of longitude along the latitude (equator), 100 kilometers due south is equivalent to nearly 1 degree of latitude along the meridian, 100 kilometers due east is equivalent to more than 1 degree of longitude along the latitude (non-equator), and finally 100 kilometers due north, which is equivalent to 1 degree of latitude along the meridian (east of the original location), and finally returns to the east of the starting point.

Starting from the equator, walk the same distance in the direction of the surrounding directions, as if returning to the origin, but you should know that the length of the latitude coils is not equal, the equator is the largest latitude coil, and when you go due south and then west along the latitude coil for these 1000 meters, because the latitude coil becomes smaller, it will be westerly, and if you go back along the meridian, you will find the west side at the origin

Therefore, c

Solution: From 40 km north of the equator to the south to the equator, the length of the latitude becomes longer, and the length of the latitude from the equator to the south becomes shorter Walk 100 km from 40 km north of the equator to the south and reach 60 km south of the equator, the length of the latitude here is shorter than the latitude 40 km north of the equator, so from 40 km north of the equator to due south, due east, due north, and due west for 100 km, and finally to the east of the starting point

The earth is round, so it takes 1 km at high latitudes to cover more longitude than at low latitudes, which means that high latitudes travel faster than low latitudes in an east-west direction. So when this person goes 100 kilometers south, he reaches 60 kilometers south of the equator, which is higher than the latitude just now, so it is faster to go 100 kilometers east than to go back to the northern hemisphere and go west, so in the end it should be east of the starting point, choose d.

Typing is not easy, such as satisfaction, hope.

Question B Analysis: The distance between any two parallels is constant, and the distance between the two meridians is the largest from the equator, decreasing towards the poles. Thus starting 60 km north of the equator, going 100 km south to the latitude of 40 km south of the equator, 100 km to the east, 100 km to the north, and 100 km to the west, back to the same parallel, but 40 km south of the equator and 100 km east of the latitude is smaller than the latitude spanned 60 km north of the equator, so it is west of the starting point.

Test Place: This question examines the comprehensive application of graticule.

Comments: The key to solving this problem is to grasp the distribution law of the length of the latitude at different latitudes, combined with map analysis.

Starting from the equator, walk the same distance in the direction of the surrounding directions, as if returning to the origin, but you should know that the length of the latitude coils is not equal, the equator is the largest latitude coil, and when you go due south and then west along the latitude coil for these 1000 meters, because the latitude coil becomes smaller, it will be westerly, and if you go back along the meridian, you will find the west side at the origin