Geographically, which prime meridian is the meridian referring to?

The prime meridian is the meridian (prescribed as the 0° meridian) through the original site of the Greenwich Observatory in London, England.

The prime meridian is the dividing line between the east and west longitudes of the earth, that is, the dividing line between the eastern and western hemispheres. The finch told the land of the year.

The prime meridian refers to the meridian band that connects the north and south poles on the earth. The prime meridian, the zero degree meridian on the earth, the meridian indicates the north-south direction, all the meridians are equal in length, and the degree marked by the meridian is the longitude.

The prime meridian measures the geographical longitude from the prime meridian to the east and west, respectively, from 0 to 180 degrees. In 1884, the International Meridian Conference held in Washington, D.C., decided to adopt the meridian of the Eri Middle Star Instrument through the Royal Observatory Greenwich (former site) in London, England, as the standard reference meridian for time and longitude measurement, called the prime meridian.

The geographical significance of the prime meridian is the zero degree longitude on the earth, it is the standard reference meridian dust bucket used to determine the longitude of the earth and the global time, it is not like the latitude line has a natural starting point equator.

On a globe, the line connecting the north and south poles is called the meridian or meridian. The meridian indicates the north-south direction, all the meridians are equal in length, and the degree marked by the meridian is the longitude. The meridian that passes through the original site of the Greenwich Observatory in London is called 0.

The prime meridian, or 0 degree meridian, also known as the Greenwich meridian or Greenwich meridian, is a meridian (also known as 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.

Prime meridian (**** in the network).

But where does the prime meridian come about?

The world-famous Gora Rinnich Observatory was built in 1675. At that time, the seafaring industry in Britain was developing rapidly. In order to solve the need to measure longitude at sea, the British authorities decided to build an observatory in the Royal Greenwich Gardens on the banks of the River Thames, about 20 kilometers from the city center in the southeastern suburbs of London.

Greenwich Observatory (**** on the Internet).

After 1835, the Greenwich Observatory was expanded and updated under the leadership of the brilliant astronomer Eri. He pioneered the use of the "meridian ring" to determine Greenwich Mean Solar Time. It became the most advanced astronomical observatory in the world at that time.

Meridian Ring (**** on the Internet).

With the development of the world's maritime industry, many countries have established observatories to measure local time. Internationally, in order to coordinate the measurement of time and determine the geographical longitude, the International Longitude Conference was held in Washington in 1884. The meeting decided to pass the meridian of the Greenwich Observatory at that time as the standard reference meridian for the global time and longitude meter, called the 0 meridian or prime meridian.

Prime meridian (**** in the network).

Since then, not only have maps published by various countries use this line as the starting point of geographical longitude, but also use the Greenwich Observatory as the starting point of the "world time zone", and use Greenwich chronometers to calibrate the time.

The prime meridian passes through London, England.

The prime meridian refers to the zero degree difference wide meridian on the earth, the meridian indicates the north-south direction, all the meridians are equal in length, and the degree marked by the meridian is the longitude. Internationally, the meridian that passes through the original site of the Greenwich Observatory in London, England is called the 0° meridian, also known as the prime meridian.

Because at that time, unlike the beginning of latitude (i.e., the equator), which could be determined by the Earth's axis of rotation, any meridian could theoretically be defined as the prime meridian, so there were different positions for this line in history. In 1851, the royal astronomer Sirgeorgeairy set up a mesosphere at the Greenwich Observatory to determine the Greenwich meridian.

Because more than two-thirds of ships at that time had used the line as a reference meridian, it was officially designated as the starting point of longitude at the International Prime Meridian Congress held in Washington, D.C., in 1884. A total of 41 delegates from 25 countries participated, and the representative of France abstained from voting, and until 1911 France still used the Paris meridian as the starting point of longitude.

Geographic Definition:

The starting longitude that measures longitude on Earth. Also known as the zero meridian. From the prime meridian, the geographical longitude is measured east and west, respectively, from 0° to 180°.

In 1884, the International Meridian Conference held in Washington, D.C., decided to adopt the meridian of the Eri Middle Star Instrument through the Royal Observatory (former site) of Greenwich (Greenwich) in London, England, as the standard reference meridian for time and longitude measurement, called the prime meridian.

After the relocation of the Greenwich Observatory in 1957, the International Time Bureau used a number of observatories to define the origin of the mean observatorial longitude on the equator, which was derived from the longitude values of these observatories and the time measurement data. Since 1968, the meridian passing through the origin of international customary origin and the origin of longitude of the average observatory has been used as the prime meridian.

The prime meridian is a virtual line that passes through the earth at 0° longitude, and it is used as a conventional line to determine the starting point of each time zone in the world. According to the agreement, the prime meridian passes through a point at infinity in Greenwich, London, England, where there is a facility called the Son Greenwich Observatory.

Therefore, the prime meridian does not pass directly through any city. However, Greenwich became the reference for Greenwich Mean Time (GMT). The other time zones are divided according to the east-west direction of the prime meridian, with east longitude increasing from 0° and west longitude decreasing from 0°.

For example, the place at 120°E is located on the 120°E meridian, while the place at 90°E is located at 90° east of the prime meridian. Similarly, the 90° meridian west of the Earth is located 90° west of the prime meridian

The longitude of the prime meridian is 0°, meaning: the prime meridian is the starting point for calculating the east-west longitude, and it is the zero degree longitude on the earth, which is the standard reference meridian used to determine the longitude of the earth and the global time, it has a natural starting point - the equator like the latitude. The longitude of the prime meridian is 0°, meaning:

The prime meridian is the starting point for calculating the east-west longitude, the zero degree longitude on the earth, and it is the standard reference book scattered meridian used to determine the longitude of the earth and the global time, unlike the latitude line, which has a natural starting point - the equator.