Who was the first person in the world to measure the latitude and longitude lines

No, it should be a line of monks in the Tang Dynasty of China, or a line of monks, and Guo Shoujing of the Yuan Dynasty is also committed to the study of the meridians, but the conditions have not been completed. But the prime meridian, the word meridian is obviously a Chinese-style naming. The Greenwich Observatory in London, England, was the first to be named after him, but they were not the first to measure.

As early as the second century B.C., the ancient Greeks recognized that if the same event was observed in two different places and the local time of the event was recorded, the longitude difference between the two places could be obtained by calculating the time difference between the two places. The question is, how to determine the time difference between the two places? At first, the ancient Greek astronomer Hipparchus proposed to solve this problem by observing a lunar eclipse.

However, since the sun has already set below the horizon when a lunar eclipse occurs, it is impossible to use the heat to keep time, and there are few opportunities for a lunar eclipse to occur, so it is difficult to complete. It is said that Hipparchus once compiled a list of 600 lunar eclipses, which is spiritually valuable. Later, the ancient Greek astronomer and cartographer Ptolemy proposed an equally spaced coordinate grid to calculate with "degrees", and he was the first in the world to explicitly put forward the theory of latitude and longitude.

A monk from the Tang Dynasty in China....

The meridians and parallels were drawn on globes and maps in order to determine the position and direction on the earth, and there were no latitude and longitude lines on the ground.

Internationally, the meridian that passes through the original site of the Greenwich Observatory in the United Kingdom is called the 0° meridian.

Also called prime meridian.

From the 0° meridian to the east is called the east longitude; To the west is called the West Longitude. Since the Earth is a sphere, it has 180° east and west longitudes180°E and 180°W are on the same meridian, that is the 180° meridian.

The origin of the warp and weft lines.

He found that the route of Alexander's crusade was similar from west to east, regardless of the change of seasons and the length of sunshine. An important contribution was made——— drawing for the first time on earth a line of latitude that stretched from the Strait of Gibraltar to the Torus and the Himalayas.

All the way to the Pacific Ocean.

Later, Eratos, who had long served as the director of the Library of Alexandria in ancient Egypt.

Measuring the circumference of the Earth at 46,250 kilometers, he drew a map of the world with 7 meridians and 6 parallels.

In 120 C.E., Claudius Ptolemy synthesized the results of his predecessors and concluded that maps should be drawn according to known latitude and longitude.

Based on the fixed point, the concept of drawing a network of latitude and longitude lines on the map is proposed. To do this, Ptolemy measured the Mediterranean.

The latitude and longitude of important cities and observation points in the area have been compiled in eight volumes of geography. This includes the latitude and longitude of 8,000 places. In order to depict the latitude and longitude lines on the earth, he managed to draw the latitude and longitude into simple fan shapes, thus drawing a famous "Ptolemaic map".

At the beginning of the 15th century, the navigator Henry began to put the "Ptolemaic map" into practice. However, after repeated investigations, it was found that the map was not practical. Some of Henry's captains said regretfully

In spite of our admiration for the famous Ptolemy, we find that the truth is the opposite of what he says. ”

To correctly determine latitude and longitude, the key is to have a "standard clock".It is obviously much more convenient and practical to make accurate clocks to keep time at sea than to rely on celestial bodies. There was a watchmaker Harrison in Yorkshire, England, who spent 42 years making five chronographs in a row, each more accurate than the other.

The fifth is only the size of a pocket watch, and the error in determining longitude is only one kilometer. At the same time, a marine timepiece designed and manufactured by the French clockmaker Pierre Leroy was put into use. At this point, the problem of determining longitude at sea has finally been preliminarily solved.

The longitudinal straight line of the fabric is called "warp", and the horizontal line is called "weft".The text is the same as "The Weaver Woman's Resentment".

Poem: "All words are good, self-love is dense".