Longitude and latitude
In order to accurately display the position of every place on the earth, people assume a coordinate system for the earth's surface, that is, latitude and longitude lines. So, how did the original longitude and latitude lines form? How to measure? In 344 BC, Alexander crossed the sea and invaded, then moved eastward. Military geographer Nierkus searched for information along the way and prepared to draw a "map of the world". He found that on the route of Alexander's eastward expedition, from west to east, the change of seasons was similar to the length of sunshine. So he made an important contribution-for the first time, he drew a parallel line on the earth, starting from the Strait of Gibraltar, along the torus and Himalayas, and reaching the Pacific Ocean.
Alexander's empire was a flash in the pan and soon collapsed. But in Alexandria, Egypt, a famous library appeared. Eratosthenes, a curator for many years, is well-read and proficient in mathematics, astronomy and geography. He calculated that the circumference of the earth was 46,250 kilometers and drew a map of the world with 7 meridians and 6 latitudes.
15 19- 1522, Magellan's fleet traveled around the world, passing through the Atlantic Ocean, the Pacific Ocean and the Indian Ocean, and finally returned to Spain, which proved that the earth is a sphere and laid the foundation of latitude and longitude.
In order to accurately display the position of every place on the earth, people assume a coordinate system for the earth's surface, that is, latitude and longitude lines. So, how did the original longitude and latitude lines form? How to measure? In 344 BC, Alexander crossed the sea and invaded, then moved eastward. Military geographer Nierkus searched for information along the way and prepared to draw a "map of the world". He found that on the route of Alexander's eastward expedition, from west to east, the change of seasons was similar to the length of sunshine. So he made an important contribution-for the first time, he drew a parallel line on the earth, starting from the Strait of Gibraltar, along the torus and Himalayas, and reaching the Pacific Ocean.
Alexander's empire was a flash in the pan and soon collapsed. But in Alexandria, Egypt, a famous library appeared. Eratosthenes, a curator for many years, is well-read and proficient in mathematics, astronomy and geography. He calculated that the circumference of the earth was 46,250 kilometers and drew a map of the world with 7 meridians and 6 latitudes.
15 19- 1522, Magellan's fleet traveled around the world, passing through the Atlantic Ocean, the Pacific Ocean and the Indian Ocean, and finally returned to Spain, which proved that the earth is a sphere and laid the foundation of latitude and longitude.
In order to accurately display the position of every place on the earth, people assume a coordinate system for the earth's surface, that is, latitude and longitude lines. So, how did the original longitude and latitude lines form? How to measure? In 344 BC, Alexander crossed the sea and invaded, then moved eastward. Military geographer Nierkus searched for information along the way and prepared to draw a "map of the world". He found that on the route of Alexander's eastward expedition, from west to east, the change of seasons was similar to the length of sunshine. So he made an important contribution-for the first time, he drew a parallel line on the earth, starting from the Strait of Gibraltar, along the torus and Himalayas, and reaching the Pacific Ocean.
Alexander's empire was a flash in the pan and soon collapsed. But in Alexandria, Egypt, a famous library appeared. Eratosthenes, a curator for many years, is well-read and proficient in mathematics, astronomy and geography. He calculated that the circumference of the earth was 46,250 kilometers and drew a map of the world with 7 meridians and 6 latitudes.
15 19- 1522, Magellan's fleet traveled around the world, passing through the Atlantic Ocean, the Pacific Ocean and the Indian Ocean, and finally returned to Spain, which proved that the earth is a sphere and laid the foundation of latitude and longitude.
Meridian introduction
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 origin of meridian naming: "In the apparent motion trajectory of a celestial body, all points on the same meridian appear at the same time as the upper meridian (noon) and the lower meridian." When different meridians have different places. The east is early and the west is late.
Important meridian prime meridian
Paris meridian
180 meridian
20 degrees west longitude
East longitude 160 degrees
Weft introduction
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. Latitude indicates the east-west direction.
Arctic Circle (66 33&; Apos38 inches high)
Tropic of Cancer (23 degrees 26 minutes 22 seconds north latitude)
Equator (0° n)
Capricorn (23 26&; Apos22 inches)
Antarctic circle (66 degrees 33 minutes 38 seconds south latitude)