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Anonymous users2024-02-090° meridian (prime meridian.
It is the dividing line between east and west longitude.
The 0° latitude (equator) is the dividing line between north and south latitudes. The prime meridian, or 0 degree meridian, is also known as the Greenwich meridian or Greenwich meridian.
It is a meridian (also known as a meridian) located at the Greenwich Observatory in the United Kingdom. The east and west sides of the prime meridian are set as east and west longitudes, respectively, and meet at 180 degrees. The prime meridian is not the division of the eastern and western hemispheres.
The zero degree longitude (prime meridian) on Earth is artificially assumed, it is not like latitude, it has a natural beginning and end (equator and both ends). In this way, the choice of the zero meridian was determined after a fierce debate. In Washington, 1884.
At the International Longitude Academic Conference, it was officially determined that the longitude passing through the former site of the Greenwich Observatory in London, England should be used as the global zero degree longitude, which was recognized as the starting line for calculating longitude in the world. The arc that passes through the Earth's poles and is directly orthogonal to the equator is called the meridian, also known as the meridian. With the prime meridian as zero degrees, the eastern and western hemispheres are divided into east and west longitudes of 180° each.
But the eastern and western hemispheres are divided into 20 degrees west longitude and 160 degrees east longitude. The equator is the longest circumferential line in the trajectory of points on the Earth's surface that rotate with the Earth. Equatorial radius 6, equatorial circumference.
It divides the earth into two hemispheres, north of it and south of it is the southern hemisphere, which is the baseline that divides latitude. The equator has a latitude of 0°, which is the longest latitude on Earth. The equator is the acceleration of gravity on Earth.
The smallest place.
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Anonymous users2024-02-08Why the earth is divided into 180 degrees of east and west longitude, rather than 360 degrees, can be explained from the following aspects:
1.Geographical convenience: Dividing the earth's meridian into 180 degrees can make the longitude difference between any two points on the earth equal, which is more convenient when calculating geographic coordinates and directions.
2.Judgment of the position of the sun: The division of east and west longitude of 180 degrees can help people determine the position of the sun.
At the equator, at the spring and autumn equinoxes, the apparent motion of the Sun passes through the celestial equator, at which point the Sun is positioned at 0 degrees. In the Northern Hemisphere, during the spring and autumn equinoxes, the apparent motion of the Sun passes through the Tropic of Cancer and the Tropic of Capricorn, at which point the Sun is positioned at 90 degrees and 270 degrees. Therefore, dividing the Earth's meridian into 180 degrees can make it possible to judge the position of the Sun more accurately.
3.Direction of the Earth's rotation: The division of 180 degrees of east-west longitude also conforms to the direction of the Earth's rotation.
The direction of the Earth's rotation is from west to east, so dividing the meridian into 180 degrees can make the direction of the Earth's rotation consistent with the direction of the meridian, avoiding the situation that the meridian is opposite to the direction of rotation.
To sum up, dividing the earth's meridian into 180 degrees is in line with the laws of geography, astronomy and physics, and is more convenient and practical.
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Anonymous users2024-02-07Any two opposing meridians on a globe form a meridian coil that divides the Earth into two equal hemispheres; All the meridians are semicircular, so in the globe are two opposing meridians forming a warp coil. For example, the combination of a 0 degree warp and a 180 degree warp is a warp coil. Each warp coil bisects the earth.
The reason why the earth is divided into the eastern and western hemispheres without the two meridians of zero and 180 degrees is that the 0 degree meridian passes through western Europe and western Africa, that is, across continents, and if the 0 degree meridian is used as the dividing line between the eastern and western hemispheres, there must be many land countries divided into the eastern and western hemispheres. In this way, it is very inconvenient and awkward, and the 20 degrees west longitude crosses the Atlantic Ocean, and there may be only a few islands on it, so it provides convenience for the demarcation, since it is used as the dividing line of the eastern and western hemispheres, then the natural "opposite" of 20 degrees west longitude - 160 degrees east longitude has also become the dividing line!
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Anonymous users2024-02-06In order to prevent too many countries from being separated in the eastern and western hemispheres, let the demarcation line go from where there is no land.
20°W in the Atlantic, there will not be too many countries across the eastern and western hemispheres.
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