LATITUDE measures the distance north or south of the equator. This imaginary line circles Earth from east to west. The equator is 0° latitude. Latitude increases from 0° to 90° north and south.
LONGITUDE measures the distance east or west of the prime meridian. This imaginary line goes through the North Pole, the South Pole, and Greenwich, England. The prime meridian is 0° longitude. Longitude increases as you travel east or west until you reach the 180° meridian in the Pacific Ocean.
When writing a location’s coordinates, latitude is always listed first.
Latitude measurement: 90°N (degrees north (N) or south (S) of the equator)
Longitude measurement: 30°W (degrees east (E) or west (W) of the prime meridian)