What Is Time?

Time is used to leg time from for a theory, like when you have a clock that is based on a certain theory. Time in any theory should be defined so that the motion from the lens of that theory looks simple. When we talk about clocks, we really should be talking about clocks because what? What do we use clocks for? Right? In daytor day life? We want to keep appointments. So this idea that they should march in step is important to the concept of clocks. A good worse's bad clock will make a simple motion look complicated. If you actually try to calculate the speed of an object using a bad clock your're going to find it accelerating or decelerating