To calculate longitude, it is best to use time difference. If the time value is large, it means it is in the east. Specifically, every four minutes, 15 degrees per hour. To know the specific location, you need a map, and then mark the location corresponding to the latitude and longitude.
Extended data:
There are several latitudes: geographical latitude, astronomical latitude and geocentric latitude, and there is little difference between these latitudes. In most cases, latitude refers to geographical latitude (that is, latitude used to draw maps).
Geographical latitude is the arc length on the ground corresponding to the angle of the earth's center. Geographical latitude regards the earth as an ellipsoid, that is, the angle between the normal of the ellipsoid (slightly different from the vertical line) and the equatorial plane. Usually expressed in degrees, minutes and seconds. Measured from the equator to the north and south poles, each is 0-90. The latitudes are basically equal in width, which is 1 10 km (slightly longer near the poles).
The north of the equator is called "north latitude" and the code is "n"; The south is called "south latitude" and the code name is "S". Traditionally, 0-30 is called low latitude; 30-60 degrees is the middle latitude; 60-90 is high latitude. The latitude of Beijing is 39 degrees 57 minutes north latitude.
Baidu encyclopedia-latitude