| http://www.w3.org/ns/prov#value | - It inspired ???Twinkle, Twinkle, Little Star.??? When point sources of light twinkle, the cause is high-frequency variability in atmospheric refraction???momentary bending of light rays out of the (nearly) straight-line path between the observer and the light source.The index of refraction is the ratio of the speed of light in a vacuum to that in some medium, such as air or water.
|
