This text examines the fundamental distinction between external movements, defined as mere displacement, and internal movements, characterized as internal happenings or events. The author argues that in reality, we encounter complex combinations of various movements where we must often decide which ones are negligible based on our specific purpose. Using astronomical and geological examples, the text illustrates how a planet's orbital path can be viewed independently of internal processes like continental drift or volcanic activity, which are relatively internal to the larger system. However, the text also highlights that these internal dynamics, such as the evolution of living organisms, can significantly influence the physical composition of the environment, for instance, through the formation of limestone layers from biological remains. Ultimately, the document suggests that the classification of movement is often relative and hierarchical, requiring a nuanced understanding of how mechanical shifts and event-driven internal processes interact to shape the reality of natural phenomena and complex structures.