When sunlight passes through the atmosphere, the blue wavelengths are scattered more widely by the oxygen and nitrogen molecules, and more blue comes to our eyes. This effect is called Rayleigh scattering, after Lord Rayleigh and confirmed by Albert Einstein in 1911.[21][22]

Movement - The act of moving; change of place or posture; transference, by any means, from one situation to another; natural or appropriate motion; progress; advancement;