this example illustrates a depth cue known as: <span>Linear perspective
Linear perspective refers to the perception of size, position, and shape of an object based on the subject's perspective. Many factors could influence one's linear perspective such as elevation, distance between the subject and the object, etc.</span>
The Gravitational force from the moon and the sun are aligned with the equator, if a sateite were to orbit horizontally it would quickly come out of sync.