The line of longitude used as the origin in a system of coordinates

Prime meridian.

Hope this helps!

-Payshence

Prime Meridian

Explanation:

Prime meridian is a line of imagination that passes through Greenwich town in England separating the earth into two equal halves or hemispheres, namely the eastern and the western hemisphere. Along this line, the longitude is 0°. From this line, one can determine travelling in the eastern and the western direction.

It also helps in calculating the time zone at any place on earth.

Thus, the correct answer is Prime Meridian as it is used as the origin in a coordinate system.

i think the answer is g1

hope i

-lavira: )