Meridian is also called meridian. Why is it called meridian? What does meridian mean?

Meridians: Meridians and latitudes are drawn on globes and maps to determine the position and direction on the earth, but no longitude and latitude lines are drawn on the ground. Because the meridian represents the north-south direction, it is also called the meridian. Meridian: refers to the north and south.

During the apparent motion of a celestial body, some points on the earth's surface observe that the celestial body appears at the same time at the upper meridian (noon) or the lower meridian, and the line connecting these points is the meridian. Meridian is essentially a meridian, and like latitude, it is an auxiliary line assumed by human beings for the convenience of measurement. It connects the north and south poles of the earth and indicates the north-south direction.

The longitude line where the observer is located is the surveyor's longitude line, which is used to express the longitude information of the surveyor in astronomical navigation.

The meridian with longitude 0 is the prime meridian, which is used to divide the eastern and western hemispheres and is also the reference standard of local time.

Extended data

The main meridians are:

1, 0 Longitude: London, East Paris, West Mediterranean, Sahara Desert, Gulf of Guinea.

2.30 meridian: eastern Murmansk, eastern Moscow, St. Petersburg, the junction of eastern European plain and Bode plain, Black Sea, Asia Minor Peninsula, eastern Mediterranean, eastern Cairo, Nile, eastern East African Plateau, western South African Plateau, etc.

3.60 E Meridians: Ural Mountains, Aral Sea, Iranian Plateau, Arabian Peninsula W, Arabian Sea 4 and 90 E Meridians: Yenisei River, Altai Mountain, Junggar Basin, Tianshan Mountain, Tarim Basin, Qinghai-Tibet Plateau, Ganges Delta and Bay of Bengal.

5. Meridian120 E: East of Lena River, Daxing 'anling, west of Beijing, east of Shanghai, Philippine Islands, Malay Islands and western Australia.

6. Meridian 150 E: East Siberian Mountain, Thousand Islands, Great Divide, Canberra and Sydney.

7. Meridian 180: International international date line, Bering Sea, Aleutian Islands, Tuvalu, Fiji and Western New Zealand.

8. 30 W: Mid-Atlantic.

9. 60 degrees west longitude: Newfoundland, Caribbean, Guyana Plateau, Brazil Plateau, La Plata Plain, Antarctic Peninsula.

Meridians 10 and 90 W: Mississippi River, Gulf of Mexico and Central America.

1 1, 120 west longitude: Rocky Mountain.

Warp 12, 150 W: Alaska, Hawaii, etc.

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