Is it necessary that a new day a place that crosses the International Date Line be 0:00 local time

Not necessarily. Because if the date line is not 0 hours, then even if the date line is crossed from east to west, it is not necessarily 0 hours. This friend has to distinguish between two concepts, one is the "living line", that is, the meridian at 0 o'clock in local time, which moves regularly from east to west with the change of day and night (just opposite to the direction of the earth's rotation), and must bisect the night hemisphere, which is the dividing line between the first half of the night and the second half of the night, because it is always moving, it is a living line, and it crosses the living line from west to east, and the date must be 0:00 of the new day.

The second is the "dead line", that is, the 180-degree meridian (international date line), which stipulates that the crossing from west to east should be subtracted by 1 day, and the date is changed, and the time is unchanged. Because the line is fixed to the graticule of the earth and does not change position with the rotation of the earth, it is called a "dead line". When we do the exercises on the movement of the earth, we need to find the living and dead lines, so as to find the longitude (where the 12 o'clock is located) and the 0 longitude of the direct point of the sun.

Two special laws:

1.When the "dead line" is 0 o'clock, the global date is the same;

2.When the "dead line" is 12 o'clock, the global dates are half and half respectively, and they are exactly separated by the 0 and 180 degrees of longitude.

To sum up, if you cross the date line from east to west, the date is added by one day, that is, a new day, but the time is the same, it is not necessarily 0 o'clock.

Crossing the International Date Line, the date changes. Local time is not necessarily 0 o'clock.

The new day begins at 0 o'clock meridian and ends east to the International Date Line, where the 0 meridian is zero o'clock and is in motion.

Crossing the International Date Line from West Lead Ming to the east, the date is reduced by one day, that is, the date from the East 12th District to the West 12th District is reduced by one day; Crossing the International Date Line from east to west, the date is added by one day, i.e. one day is added from the 12th district west to the date of the 12th district east

So the answer is:

b [Analysis] The International Date Line is a broken line from north to south, and if it crosses this line from west to east, the date should be reduced by one day; If you cross this line from east to west, the date should be added by one day, so the correct answer is b.

b Moment is East plus West minus, you think. If the time to go east is added all the time, what will happen after turning the earth? The International Date Line solves this problem:

Circumnavigating the earth to the east, the time is added by 24 hours, and the date is about to be subtracted by one day. On the contrary, the same; If you go west, the time is reduced by 24 after one lap, and you must add one day to the international date line to return to the original point.

b, because crossing the International Date Line from east to west requires one day, that is, one day later, and the sun rises in the east, so the east side is earlier, so these two statements do not exist.

In general, there are two lines to find to judge the time, one is the international date change line, and the other is the zero time line. Because there are generally two 'times' in the world, i.e. on different dates. Part of it is earlier, part of it is later.

A special case is when the zero time meridian coincides with the International Date Line. But theoretically, the two generally cannot coincide exactly, as you can see from the map, we generally think that the international date line is the 180° meridian, and in reality, the international date line does not coincide with the longitude. However, we generally believe that if the 180° meridian is exactly zero, the whole world is considered to be on the same day.

The difference between the International Date Line is fixed, while the Zero Time Longitude line changes over time.

Hope mine is helpful to you.

Distinguishing method: According to the direction of the earth's rotation, if the line crossed by the earth is followed by a new day, it is the zero time line, and if the line crossed is an old day, it is the date change line.

The division of the examination area of this question. Each 15° interval of longitude is a time zone, and the time of each time ** meridian is the time of the time zone. The further east you go, the earlier it is.

For the purpose of dividing the global date, the International Date Line is defined around 180°. When crossing the International Date Line from west to east, the date is subtracted by one day, and when crossing the International Date Line from east to west, one day is added to the date. The aim is to allow the date to be earlier in the Eastern time zone than in the Western time zone, so that the global date can be free from divergence.

Therefore, the description of this question is correct.

180° date line.

This question mainly tests the knowledge of the international date line. Internationally, in principle, the 180° longitude is used as the dividing line between "today" and "yesterday", which is called the "International Date Line", referred to as the "date line".

1. The sunrise in the east of the earth is earlier than that in the west, and there is a law here on the International Date Line, which is to subtract one day from the date of the line to the east, so that the west side of the International Date Line is the earliest day on the earth.

4. It is clear that the International Date Line is in the Western Hemisphere, west of 160 degrees east longitude.

3. Australia is on one side of the date line, not on both sides.

The answer is C correct.

When crossing the International Date Line from west to east, the date should be subtracted by one day

Therefore, b