1. Determining Longitudes
North Pole
Reference: Prime meridian
Longitude
60°W 0°
South Pole
at Greenwich
(c) Longitude is measured as the angle between a line from Earth’s center to the measurement point and a line from Earth’s center to the prime (or Greenwich) meridian, which is a line drawn from the North Pole to the South Pole passing through Greenwich, England.

2. Latitude North Pole 60°N 30°N Latitude 0° Equator 30°S South Pole
(b) Latitude is measured as the angle between a line from Earth’s center to the equator and a line from Earth’s center to the measurement point.

3. 51° N 0° E Greenwich, England
44° N 122° W Portland, OR USA

6. HANDOUT