gree on the length, breadth, and height of an object, so long as we make sufficiently accurate measurements. Newton's absolute time was the time that flows inexorably forward as we age. It is a time whose flow is experienced in common by all humanity.
             The maximum speeds of birds in nature are regulated by air. No matter what direction a bird flies, it always has the same maximum speed. Newton had proposed something similar for light, which he referred to as the aether. He theorized that it was omnipresent and that it regulated the speed of light in any direction. Furthermore, since the aether was at rest in absolute space (according to Newtonian physics), anybody who is stationary will measure the same light speed in all directions, while anybody in motion will measure different light speeds.
             Newton and Galileo would have assumed that like the speeds of the two cars in the previous example, the velocity of light could be calculated in the same fashion. For example: If a car is moving at a speed of 25 meters per second with its headlights on, what is the speed of the light emitted by the headlights? Newton and Galileo would have thought, "25 meters per second for the car plus 299,792,458 meters per second for the speed of light equals 299,792,483 meters per second for the speed of the light emitted by the headlights of the car."
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