Muhammad ibn Musa al-Khwarizmi
Answer:
Longitude and Latitude
Explanation:
Latitudes and longitudes are two types of imaginary lines that are commonly used by the geographers to determine the geographic location of an area. It gives the exact coordinates (location) on the earth's surface.
The lines of Longitude are usually referred to as the arc lines that are connected from the north pole to the south pole. And on the other hand, the lines of latitudes are defined as those lines that are oriented parallel to the equator running from the east to the west direction. Both the lines of latitudes and longitudes are perpendicular to each other. These are commonly shown on the map with definite numbers.
The upstream of a river can be determined by..
the direction of the points of the V shapes on contour lines.
Good luck! :)
Answer:
It's a global navigation satellite system that provides location, velocity and time synchronization. GPS is everywhere. You can find them in your car, phone, and watch.