Time Dilation:

The relative position of an observer in space influences the relative readings of clocks positioned at various points. Likewise, relative motion in space influences the apparent rate at which the time "flows." Sir Isaac Newton theorized that time flows in an absolute manner and that it comprises a primary constant in the universe. Einstein illustrated that this is not the situation; it is the speed of light, not time, which is constant. In order to recognize why relativistic time dilation takes place based on Einstein's theory.