The problem of the movement of the earth in the first year of high school, the question of the movem

Point B is 12 noon, which is very simple, point B is located in the center of the day, in the position of direct sunlight

As can be seen from the figure, b is 90°W, and Beijing time is 120°E.

The time difference is 1 hour, the longitude is 15°, from 120°E to the east, across the 180° international date line, and then to 90°W, the difference is 150°, so it is 10 hours, 12 o'clock in B, so Beijing time will be reversed by 10 hours, it is 2 o'clock in the morning.

This kind of problem is done with three missing one, i.e., 120°E (180°) 90°W x 12:00

By 1 hour difference of 15 °, the launch x is 2 points.

Point B is 12 o'clock, because the meridian where point B is located is facing the sun, that is, the sun is shining directly, so it is 12 o'clock. This is an implicit condition, just remember it.

Beijing time is calculated as the meridian where point b is located is 90 degrees west longitude, which is 12 o'clock. Beijing is in the 8th district of the east, 90 west longitude is in the 6th district of the west, the difference between the two places is 14 time zones, using the principle of east plus west subtraction, 12 + 14 is 26 o'clock, forward 24 hours, that is, 2 o'clock in the morning. The answer is 2 o'clock.

B o'clock at 12 o'clock, because the sun is shining in the middle of the day. Here the earth is directly opposite at 90'e, East Zone 6, 0 o'clock, then Beijing East Zone 8, plus two hours, 2 o'clock.

Because the world is divided into 24 time zones, with a maximum difference of 24 hours, i.e., the East Twelve and West Twelve regions, there are at most two dates on Earth.

There are two date lines on Earth. One is the 180-degree meridian (this one is fixed) and the other is the one when the local time is zero (this one is constantly changing).

The time of a known time zone is found in another time zone.

It's 10:10 on September 10 in New York, what time is it in Beijing?

Beijing, East 8th District, New York, West 5th District (East Positive, West Negative).

Time asked = time given - (time zone given time - time zone sought) Note: If the difference is less than 0, add 24 but the date should be 1 day earlier; If the difference is greater than 24, subtract 24, but add 1 day to the date. Points remain the same.

Your algorithm is a bit difficult to understand.

According to Beijing's east of New York, there are 13 time zones that the time is.

Based on Beijing's west of New York, there are only 11 time zones.

The time is 10:10 + 24:00-11:00 = 23:10 There is also a change in the date that crosses the date line, which is difficult to understand.

Actually, the result is the same, I'm going to proctor.

There are a total of 24 time zones

According to the calculation of Beijing in the east of New York, the number of time zones you have one by one is 13!

If you calculate according to Beijing's time zone west of New York, the number of time zones is 11, how can you still subtract 13, shouldn't you subtract 11?

Hello classmates, from the language organization of your questions, it can be seen that you lack knowledge of geography. The basic concepts are not clear.

Start by correcting your misconceptions.

1 The longitude of Beijing is about 116e, and the time zone where Beijing is located is the East 8th District, and the specific range of the East 8th District is to, a total span of 15 degrees. **Exactly 120e. We are generally accustomed to using the ** longitude degree of each district as a representative of that district.

Beijing, the capital of our country, is located in the East Eighth District, so we are accustomed to calling this district time Beijing time.

2 How time zones are divided. Starting from 0 degrees, 7.5 degrees from east to west are combined into the ** time zone, which can also be called the zero time zone. Then every fifteen degrees a zone.

3 The essence of the place is not understood. No time is arbitrary. The reference of this timing system is exactly the noon sun when the place time. At that time, the sun was the highest, and the shadow was the shortest, which was the reason why human beings prescribed the time in this way.

Finally, solve the problem. 1 The shadow was the shortest, and it was exactly 12 o'clock at noon when the place was visible.

2 It's 13 o'clock Beijing time, which is equivalent to 13 o'clock local time at 120e.

3 According to the textbook "East is earlier than west, 15 degrees for an hour, one degree for four minutes", it can be easily deduced from 13 o'clock to 12 o'clock that this place is 15 degrees west than 120e. A: 105e

Finally, listen carefully in class, which is the most basic. There are also many advanced techniques. Compared to this difficulty, this is 1+1 in mathematics

The 0° meridian is also a ** line, get it?

The first one: choose A, the shortest shadow of the sun is 12 o'clock, Beijing time is 1 hour faster than there, then it is 15 degrees west of Beijing, that is, 105 degrees east longitude

The second: The ** meridian of the East Eighth District should be 120° East Longitude, so the westernmost part of the East Eighth District is, and the easternmost point is 120+, and the two you said are not right.

a105° east

Beijing is the eighth district in the east, **longitude longitude 120 east longitude because 15 ° time zone The shortest shadow of the sun is 12 o'clock, and Beijing time is 1 hour faster than there, so ** meridian is 105 ° east longitude

1 All 1) c 2) b

1.In the Northern Hemisphere, the sector is yesterday's range. As you can see from the figure, this sector is 1/4 of a circle, which means that it currently accounted for 1/4 of the world yesterday.

By the way, you can combine the time zone map and divide the 24 time zones into 4 points, so that from the West 12 districts to the west 6 is yesterday, that is, the West 6 districts are 0 hours. Beijing is in the East 8th District, and they are separated by 14 time zones, so it is 14 o'clock in Beijing.

2) In the Northern Hemisphere, the shaded part is night, so it can be seen that there may be a polar day phenomenon in the Northern Hemisphere, and point C is just the tangent point between the polar day part of the Arctic Circle and the latitude, which is 0. Yes Because this fan is 1/4 of a circle, that is to say, it spans six hours from OB to OA, and OC is the midline, so OC to OA spans 3 hours. The northern hemisphere rotates counterclockwise, and ACB is the morning line, so 0+3=3, choose B.

Hehe, I wrote it myself, and the words may not be very appropriate...

This diagram is a slice of the earth's axis and along the parallel.

1.If the picture is the Northern Hemisphere, then the range represented by the fan is night, which means that in this dimensional belt, the number of days in 1 4 is night (the sky is long and the night is short, summer, 6 hours of night, I haven't touched it, it should be very close to high latitudes, is it possible for Heihe?). ）。

This topic is not rigorous.

If the sector is yesterday's range, is it relative to Beijing time or GMT? Does "fan" refer to angles or does it include dark shadows (night)? It can only be excluded one by one.

If the fan is night, then none of the answers are eligible. So the fan only refers to the string angle.

If it is relative to Beijing time, as long as you keep a distance of 2, 8, or more than 14 hours before point A, you can only exclude D

If it is relative to Greenwich Mean Time, then b and c are both eligible, and only a and d can be excluded

2.Because the angle AOB = 90°, the night time zone of ADB is covered by 6 hours (24 4), divided by 2 for 3, so B should be chosen

But I think it's more rigorous to say: if the shadow part is the night. The sunrise time in the local time zone of point A is ).

1.If the sector is yesterday's range and it is the Northern Hemisphere, then OA is the 90°W meridian and the 0 time meridian is the West 6 region, and the OB is 180°, and the West Longitude decreases counterclockwise from the sky above the Northern Hemisphere. Beijing is the eighth district in the east, so Beijing is 14 o'clock.

2.Connect the OD, then the OD is just at the midpoint of the ACB line at dawn and dusk, so the OD is 00:00, because the span here is 90°, a total of 6 hours, so the sunrise time at point A is 3 o'clock.

I hope this can help you, and if you have any questions, feel free to ask. Thank you!

Wow, it's so hard, is this a freshman in high school?