Philosophy of the Sidereal Calendar

We can only notice our own notions of space and time when we compare our own position and cycle with another given space or cycle. In other words, what we call a world or a space only exists through a comparison with a space we are not occupying. What, then, will be our notion of time if the Earth stops its rotation, if the sun is no longer rising and setting, and if our breathing was not rhythmed by the time of inhalation and exhalation, or if our heart was not beating on a given rhythm, etc?