What are the names of the two imaginary lines from which latitude and longitude are measured?

The equator and the prime meridian

Latitude is the measure of how far north or south a location is from the equator. Latitude is measure in degrees. Each half of the earth or hemisphere is 180 degrees. Dividing that number in half, locations are between 0 and 90 degrees north or south of the equator. The equator is at 0 degrees latitude and is stretches the diameter of the earth. Latitude lines are imaginary lines that are marked every twenty degrees north and south of the equator.