What are the four lines on the earth?

Meridian, latitude, tropic of cancer, tropic of cancer

In order to determine the position and direction on the earth, longitude and latitude are drawn on globes and maps, but they are not actually drawn on the ground. Details are as follows:

Latitude-a circular line perpendicular to the earth's axis and surrounding the earth. 90 degrees north latitude and 90 degrees south latitude.

Meridian-a semicircular line connecting the North Pole and the South Pole and intersecting the latitude vertically. The longitude of east longitude and west longitude are 180 respectively, and the longitude of 0 passes through Greenwich Observatory, which is called "prime meridian".

Equator -0 parallel.

Tropic of Cancer-23.5 degrees north latitude.

Tropic of Capricorn-23.5 degrees south latitude

Primitive meridian-0 meridian

International international date line-Located on the longitude line 180 across the Pacific Ocean.

Please refer to Baidu Encyclopedia for the role of the above lines in geographical and date division.