What is the prime meridian 15, what is the prime meridian

Chinese name: 本初子线.

English name: Prime Meridian

Definition 1: An astronomical meridian by fixing the flat pole and the origin of longitude. Applied Disciplines: Surveying and Mapping (first-level discipline); Geodesy (secondary discipline).

Definition 2: A meridian with a longitude of zero degrees. Refers to the meridian that passes through the Greenwich Observatory in the United Kingdom. Applied Disciplines: Naval Architecture Engineering (First-level Discipline); Ship Communication and Navigation (Secondary Discipline).

Definition 3: The starting line at which longitude is calculated on Earth. In 1884, the International Council of Longitude decided to use the meridian through the Greenwich Observatory in England as the prime meridian. Applied Disciplines: Geography (first-level discipline); General Introduction to Geography (Secondary Discipline).

Definition 4: A meridian on a celestial body that passes the point of origin of longitude. Applied Disciplines: Astronomy (first-level discipline); Astrometry (secondary discipline).

The prime meridian, also known as the zero degree longitude, is a standard reference meridian established to determine the measurement of geographic longitude and coordination time. The earth has a natural zero-degree latitude - the equator, but there is no natural zero-degree longitude, so the prime meridian can only be artificially selected from an infinite number of meridians. The original prime meridian was set by various countries in response to the need to determine their position.

In 1884, the International Meridian Conference held in Washington, D.C., decided to use the meridian where the Eri Middle Star Observatory (formerly site) of the Greenwich Observatory in London, England is used as the standard reference meridian for time and longitude measurement, and this meridian is called the prime meridian, also known as the zero meridian.

The prime meridian is the 0° meridian, that is, the meridian that passes through the Meridian Palace of the Greenwich Observatory in London, England, and it is the dividing line between east and west longitude.

0 degree longitude, the starting point for calculating the east-west longitude.

The prime meridian is the zero degree longitude on Earth.

0 degree longitude. Passing through Greenwich, England. A meridian that increases from 0 degrees to 180 degrees to the east is the east longitude, and a meridian that increases to 180 degrees to the west is the west longitude.

The prime meridian refers to the meridian that connects the north and south poles on the earth, and the meridian indicates the north-south direction. The prime meridian is also called the 0° meridian, the first meridian, and the zero meridian. Internationally, the meridian that passes through the original site of the Greenwich Observatory in London, England, is called the 0° meridian.

Geographical location. 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 the ships at that time had used the line as a reference meridian, in 1884 in Washington, D.C., USA.

The International Prime Meridian Congress, held at the conference, was officially established as the starting point of longitude. A total of 41 delegates from 25 countries participated in the meeting, and the representative of France abstained from voting, and until 1911 France still used the Paris meridian as the starting point of longitude.

Starting from the North Pole, the prime meridian passes through the United Kingdom, France, Spain, and Algeria.

Mali, Burkina Faso.

Togo and Ghana.

8 countries in total, then up to Antarctica. More than two-thirds of the ships have used this line as a reference meridian.

In addition to defining longitude, the Greenwich meridian.

It has also been used as a standard of time. Theoretically, noon in GMT refers to the time when the Sun crosses the Greenwich meridian. However, because the Earth's rotation speed is irregular, the standard time has been changed by Coordinated Universal Time.

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The site of the former Greenwich Observatory later became the British Ministry of Navigation and the National Maritime Museum astronomical station. The early astronomical instruments are on display, especially the copper wires ———0° warp wires embedded in the ground in the Meridian Hall, which attract visitors from all over the world. Visitors here like to take photos with their feet on both sides of the 0° longitude, symbolizing that they are stepping on both east and west longitudes at the same time.

After the Royal Observatory moved to a new site in 1950, the observatory was transferred to the National Maritime Museum, which houses an astronomical station and an astronomical instrument hall, mainly for exhibitions. Among the astronomical historical materials on display are early astronomical telescopes, clocks, globes, and armillary spheres designed by various countries (many of which were made in China at that time, and many celestial phenomena (such as Halley's Comet)).

The prime meridian is also called the 0° meridian, the first meridian, and the zero meridian. 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.

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.

The Greenwich Prime Meridian was determined on October 13, 1884, at the site of the Royal Observatory Greenwich, London, England.

The prime meridian refers to the meridian 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 use 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 prime meridian refers to the meridian that connects the north and south poles on the earth, also known as the 0° meridian. The prime meridian is a standard reference meridian used to determine the longitude of the earth and the time of the world, and the longitude value is measured from the prime meridian to the east and west, respectively, with the east of the prime meridian being the east longitude and the west being the west longitude.

The prime meridian is actually the 0° meridian line, which is used to determine the longitude of the earth and the global time. The prime meridian is the zero degree meridian on the earth, which points to the north and south, linking the north and south poles. The prime meridian does not have a natural starting point like the latitude – the equator.

The prime meridian was born in 1884, and on October 13, 1884, an international conference of astronomers was held in Washington, D.C., and it was decided to use the meridian passing through Greenwich, southeast of London, England, as the prime meridian as the starting point for calculating geography and the starting point of the world standard "time zone".

The origin of the name of the prime meridian

The prime meridian is the starting point for calculating the east-west longitude, which was born in 1884 and did not officially determine the origin until 1968. Because the ancients took "Zi" as the north and "Wu" as the south, the geographical meridian is called the meridian in China, and the 0° meridian is called the prime meridian.