Jinan: Longitude: 1 16.98? Latitude: 36.67 degrees
Shanghai: Longitude: 12 1.47? Latitude: 3 1.23
Latitude and longitude are the combined names of longitude and latitude, which form a coordinate system. Known as the geographical coordinate system, it is a spherical coordinate system that uses the sphere of three-dimensional space to define the space on the earth, and can mark any position on the earth.
longitude
East longitude is positive and west longitude is negative. Longitude is the degree of a place on the earth from the north-south line called the prime meridian to the east or west. The longitude of the prime meridian is 0, and the longitude of other places on the earth is east longitude 180 or west longitude 180. This line is chosen as the prime meridian, which is different from the latitude with the equator as the natural starting point and the longitude without the natural starting point. British cartographers used the meridian passing through Greenwich Observatory in London as the starting point, and other countries or people used other meridians as the starting point in the past, such as Rome, Copenhagen, Jerusalem, St. Petersburg, Pisa, Paris and Philadelphia. Greenwich meridian was officially designated as the starting point of longitude at the international prime meridian conference in 1884. East longitude 180, that is, west longitude 180, is approximately equivalent to the international international date line. There is a day difference between the dates on both sides of international international date line.
Longitude refers to the dihedral angle formed by the meridian plane passing through a place and the prime meridian plane. The longitude east of the prime meridian is called east longitude, and the longitude west of the prime meridian is called west longitude. East longitude is represented by "e" and west longitude by "w".
Every degree of longitude is divided into 60 minutes and every minute into 60 seconds. Therefore, the longitude is usually like this: 23 27' 30 "East or 23 27' 30" West. In a more accurate longitude position, the second is expressed as a decimal of minutes, for example, East longitude 23 27.500', but there is also usage and its decimal: East longitude 23.433. Sometimes the western longitude is written as a negative number: -23.433. But occasionally people write the east longitude as a negative number, but this is quite unusual.
latitude
North latitude is positive and south latitude is negative.
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 recorded as n; The latitude at a point south of the equator is called the south latitude, and it is recorded as S.
Areas with latitude values between 0 and 30 degrees are called low latitude areas; The area with latitude value between 30-60 degrees is called mid-latitude area; Areas with latitude values between 60 and 90 degrees are called high latitude areas.