Another way to think about this is that L1 is the result of centrifugal force, which is a 'fictitious' or apparent force. A 'fictitious' force is an artifact o

Another way to think about this is that L1 is the result of centrifugal force, which is a 'fictitious' or apparent force. A 'fictitious' force is an artifact of ones chosen frame of reference. Under general relativity gravity is also a 'fictitious' force.