What is the highest degree of longitude that can be measured?

Since the equator is 0 , the scope of the north shaft, 1/4 of the route far and wide going in a northerly course, would be 90 N. This is the highest latitude possible.

the highest degree of longitude that can be measured is 90 degrees to the north

one of the major compromises in the constitutional convention was between the small states and big states. the small states wanted each state to have the same number of representatives in congress. the big states wanted representation based on population.