Ideas of relativity and invariance exist in Newton`s ordinary mechanics and can be illustrated by simple mechanical experiments. Consider a child on a regular train that releases a ball and drops it directly. From the children`s point of view, it begins with rest and falls vertically with a steady downward acceleration. Someone looking from the outside of the train would have a different vision. The real path of the bullet in the room, the outside observer would say, is a parable. The bullet had a forward movement when it was released and fell like a projectile through a paraborable arc. However, the outside observer acknowledged that the child was right to attribute regular downward acceleration to the ball and, in fact, both would agree on the extent of the acceleration. We can summarize in a short table the areas of convergence and differences of opinion between the two observers. Remember that this painting refers to Newtonian mechanics. Einstein`s new mechanics will require a change. There are obvious differences on the position, because there are differences of opinion on the form of the process. There are also obvious discrepancies over speed, as the outside observer considers the ball to be a horizontal component of the speed, while the internal observer considers the ball only as a vertical speed.
There are also possible differences of opinion on coordinates, which is not necessarily related to the relative movement of observers. Two observers can always choose different coordinate systems to which they can refer to their measurements. Multiply the quotient value by 100 to get the percentage parity for the equation. You can also move the decimal place to the right two places, which offers the same value as multiplying by 100. However, for time zones, clocks measure something more abstract than the location of the sun. We set the clock in the middle of the time zone to be correct if it matches the sun, so we set all the other watches in that time zone to be correct if they match the central clock. Thus, a watch at the edge is of a time zone that reads 11:30 when the sun is above the head would always be accurate, as it corresponds to the central clock. A clock that would be read at 12:00 p.m. would not be accurate at that time. The idea of getting used to it here is that accuracy refers only to the agreement between the measured value and the expected value, and that it may or may not say something about the quality of the measuring instrument.