Why the dividing line between the eastern and western hemispheres is not the prime meridian

Prime meridian.

It passes through the former site of the Greenwich Observatory in the United Kingdom, passes through London, and if it were to be bounded, Britain and some countries would be divided into two hemispheres, and the line of demarcation would be divided.

Move 20° westward, 20°W from the Atlantic.

Through, 160°E is also in the Pacific Ocean better, which maintains the integrity of the division.

Theoretically, noon in GMT is when the Sun crosses the Greenwich Meridian.

time. However, because the Earth's rotation speed is irregular, the standard time has been changed by Coordinated Universal Time.

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Many people have always thought that the prime meridian is the dividing line between the eastern and western hemispheres, and a friend went to London on a business trip, went to the Greenwich Observatory, and sent a circle of friends to tell me that his feet crossed the eastern and western hemispheres, and I laughed. Looking at the division of the eastern and western hemispheres under the 3-dimensional earth, it turns out that it is not the prime meridian, and the geography of junior high school is common sense.

The prime meridian passes through the land of Europe and Africa. If the eastern and western hemispheres were divided by the prime meridian, some countries would be divided into the eastern and western hemispheres. The division of the eastern and western hemispheres by a 20°W meridian is intended to avoid land.

The prime meridian is not the dividing line between the eastern and western hemispheres. The dividing line between the eastern and western hemispheres is a meridian of 20°W and 160°E. The Eastern Hemisphere is between 20°W east and 160°E, and the Western Hemisphere is between 20°W and 160°E.

The dividing line between the eastern and western hemispheres is the prime meridian. The dividing line between the Eastern and Western Hemispheres is theoretically based on the prime meridian (i.e., the 0 degree meridian) and the 180 degree meridian. In fact, the eastern and western hemispheres are divided by 20 degrees west longitude and 160 degrees east longitude, taking into account the countries they pass through and the distribution of land and sea.

Starting at the North Pole, the prime meridian passes through eight countries, including the United Kingdom, France, Spain, Algeria, Mali, Burkina Faso, Togo and Ghana, and then reaches the South Pole. More than two-thirds of the ships have used this line as a reference meridian.

The significance of the establishment of the prime meridian.

The longitude value starts from the prime meridian and is measured to the east and west, respectively, at 0°-180° or 0-12° respectively. The east of the prime meridian is east longitude and the west is west longitude, and the global longitude measurement is based on the intersection point e of the prime meridian and the equator as the longitude origin. After 1957, the Greenwich Observatory moved to the site of the observatory, and several observatories with good long-term stability were used internationally to maintain the longitude origin, and the original longitude of these observatories was used to reverse the longitude origin of their respective longitude.

The point that is the origin of the global longitude is determined and maintained by the difference between the mean of these longitude origins and the difference between point e.

No. The dividing line is 160 degrees east longitude and 20 degrees west longitude. The eastern hemisphere is between 20°W and 160°E.

The western hemisphere is between 160°E and 20°W. If you stand at the poles, you can say that you have one foot in the western hemisphere and one foot in the eastern hemisphere, because there is no detailed dividing line between any adjacent hemispheres.

a Dividing line between the Eastern and Western Hemispheres.

b Dividing line between east and west longitude.

c The dividing line between the east-west directions of the Earth.

d The dividing line between the north and south directions of the Earth.

Answer: B. 20° W and 160° E (20°W, 160°E) are the dividing lines between the eastern and western hemispheres.

The eastern hemisphere is between 20°W and 160°E. The western hemisphere is between 160°E and 20°W. For example, the latitude and longitude of Beijing is:

116° east longitude, 40° north latitude. East longitude 116° belongs to the east of 20° west longitude and west of 160° east longitude, which is the eastern hemisphere.

From the 0° meridian to the east is called the east longitude; To the west is called the West Longitude. Since the Earth is a sphere, it has 180° east and west longitudes. 180°E and 180°W are on the same meridian, that is the 180° meridian.

The longest coil of latitude, the equator, is called the 0° parallel. The latitude measured from the equator to the north is called the north latitude; The one to the south is called the southern latitude. There are 90° north and south latitudes. The North Pole is 90° north latitude and the South Pole is 90° south latitude.