User:Hussein Mohammad Abou Reda/sandbox

Classical and modern relativity:

The relativity of the speed of light and the absolute space and time in the Classical view, the relativity of space and time and the absolute speed of light in the modern view.

The Classical view regards time and space as absolute in all inertial frames of reference and the speed of light as relative; the relativity of the speed of light arises contradictions with the principle of relativity of motion by means it implies the existence of a universal frame of reference which does not exist.

The modern view regards the speed of light as absolute in all inertial frames of references in accordance with the absence of a universal frame of reference and the principle of relativity of motion; thus making time and space relative by means the speed of light which is simply the distance travelled by light during an interval of time, is absolute in all frames of reference, so the time measured by the passage of light for the same distance in two different inertial frames of reference must be relative, also for the same distance measured by the passage of light in the same interval of time in two different inertial frames of reference must be relative.