Why the motion of earth around the sun is periodic motion but is not vibratory.
When a body rotates about a particular point or a line, keeping the distance of the particles of the body unchanged, it is called circular motion. Earth revolves around sun as it crosses a specific point at specific time that is why earth's motion is circular motion.
Again, Periodic Motion If the motion of a moving object is such that it passes repeteadly through a definite point in the same direction in the same manner is called a periodic motion. However, earth revolves around sun at same direction. Therefore, it is not a periodic motion.
