The longitude is divided into 360 degrees, and there are 1 time zones every 15 degrees, where 0 degree is called the prime meridian, which is the first place to enter a new day, and then every 1 time zone difference to the west is 1 hour. For example, it's 5: 00 a.m., so one time zone in the west is 4: 00 a.m., and the other time zone 1 is 3: 00 a.m., and so on, and the east is just the opposite, all the way to the prime meridian, which means that the difference between the two sides of the prime meridian is just 23 hours.

From the equator to the poles, the latitude is higher and higher. The equator is the dividing line between the northern and southern hemispheres.

Latitude and longitude 1 degree =60 minutes =3600 seconds. This hexadecimal system was customized by the Babylonians, and we still use it today, as long as the angle and circle are the same.

2. Latitude

The equatorial latitude is 0, which divides the earth into the southern hemisphere and the northern hemisphere.

Latitude refers to the line-plane angle between a point and the center of the earth and the equatorial plane of the earth, and its value is between 0 and 90 degrees. The latitude of the point located north of the equator is called north latitude, which is denoted by n, and the latitude of the point located south of the equator is called south latitude, which is denoted by s.

Areas with latitudes between 0 and 30 degrees are called low latitudes, areas with latitudes between 30 and 60 degrees are called middle latitudes, and areas with latitudes between 60 and 90 degrees are called high latitudes.

Equator, Tropic of Cancer, Tropic of Cancer, Antarctic Circle and Arctic Circle are special parallels.

Extended data:

Development history

In 120, a young man also studied astronomy and geography in this ancient library. This is Claudius Ptolemy. Ptolemy integrated the previous research results, thought that maps should be drawn according to fixed points with known latitude and longitude, and put forward the concept of drawing latitude and longitude network on maps.

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 "Ptolemy Map" into practice. However, after repeated inspection, I found that this map is not practical. Some of Henry's captains said with regret, "Although we admire the famous Ptolemy very much, we found that the fact is contrary to what he said."

A "standard clock" is the key to correctly determine the latitude and longitude. It is obviously more convenient and practical to make accurate clocks and watches at sea than to rely on celestial bodies to time.

/kloc-the progress of mechanical technology in the 0/8th century has finally created conditions for solving this long-standing problem. Harrison, a watchmaker in Yorkshire, England, spent 42 years making five timepieces in succession, each of which is more accurate and perfect than the other, and the accuracy is getting higher and higher. The fifth stop is only the size of a pocket watch, and the error caused by longitude measurement is only 1/3 miles.

Almost at the same time, a sea timepiece designed and manufactured by French watchmaker Pierre leroy was put into use. At this point, the problem of longitude measurement at sea has finally been initially solved.

Baidu encyclopedia-latitude and longitude