<P> Eratosthenes in the 3rd century BC first proposed a system of latitude and longitude for a map of the world . By the 2nd century BC Hipparchus was the first to use such a system to uniquely specify places on the earth . He also proposed a system of determining longitude by comparing the local time of a place with an absolute time . This is the first recognition that longitude can be determined by accurate knowledge of time . In the 11th century Al - Biruni believed the earth rotated on its axis and this forms our modern notion of how time and longitude are related . </P>
<P> Eratosthenes in the 3rd century BC first proposed a system of latitude and longitude for a map of the world . By the 2nd century BC Hipparchus was the first to use such a system to uniquely specify places on the earth . He also proposed a system of determining longitude by comparing the local time of a place with an absolute time . This is the first recognition that longitude can be determined by accurate knowledge of time . In the 11th century Al - Biruni believed the earth rotated on its axis and this forms our modern notion of how time and longitude are related . </P>
who invented the latitude and longitude grid system
who invented the latitude and longitude grid system
Hipparchus
Hipparchus