Latitude and longitude is a coordinate system composed of longitude and latitude. It is a spherical coordinate system that uses the spherical surface of three-dimensional space to define the space on the earth, and can mark any position on the earth.
Latitude, like longitude, is an auxiliary line assumed by human beings for the convenience of measurement, which is defined as the trajectory formed by a point on the earth's surface with the rotation of the earth. Any latitude is round and parallel to each other.
The length of latitude is the circumference of the equator multiplied by the cosine of latitude, so the longest latitude at the equator, the farther away from the equator, the shorter the circumference, and it will shrink to zero at the poles. From the equator to the north and south at 90 degrees, they are called north latitude and south latitude respectively, and are represented by "N" and "S" respectively. Longitude is divided into east and west, indicating north and south, and latitude is divided into north and south, indicating east and west.
Meridian, also known as meridian, is an auxiliary line assumed by human beings for the convenience of measurement, and is defined as a semi-circular arc on the great circle connecting the north and south poles on the earth's surface. Any two meridians are equal in length and intersect at the North Pole and the South Pole. Each meridian has its corresponding numerical value, which is called longitude. The meridian represents the north-south direction.
The development history of Jingwei:
In 120, a young man studied astronomy and geography in this ancient library. This is Claudius Ptolemy. Ptolemy synthesized the previous research results, and thought that drawing a map should be based on fixed points with known latitude and longitude, and put forward the concept of drawing a network of latitude and longitude on a map. To this end, Ptolemy measured the latitude and longitude of important cities and strongholds in the Mediterranean and compiled eight volumes of geographical works.
Including the latitude and longitude of 8000 places. In order to draw the longitude and latitude lines on the earth on a plane, he tried to draw them into simple sectors, thus drawing the famous Ptolemy map. /kloc-At the beginning of the 5th century, the navigator Henry began to put the Ptolemy map into practice.