Why Aircraft Fly Slowly Looks at the sky?

Of course we Ever See The aircraft crossed the sky right? it seems really really slow flying. let's discuss. When we see something moving object, we ought to realize is the change point of view of our eyes on the moving objects. Objects that are close to us, although not moving too fast, would make us play the head just to see where the object is now located.

Why Aircraft Fly Slowly Looks at the sky?

When you see something moving objects in the distance, viewing angle changes that occur not as if the object is near us, so we feel that the object was moving slowly, as the plane was flying far above us.

Another example is the moon. The moon moves around the earth with an average speed of 1022 Km / h, but because of the distance between us and the distant moon, the moon does not seem to move at all, because we almost do not feel the change in perspective.