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

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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