Reference: Postulate Mechanics
The Time
When we sense some substance, that substance must be persisting or enduring to some degree. This duration is a dimension of substance that is called TIME. When there is no substance, nothing is enduring and there is no time.
Objects that are enduring forever appear to be fixed, such as, the configurations of stars in the sky. Objects that are enduring to a lesser degree appear to change. For example, we have planets wandering among the fixed stars. These planets are changing in their location in space. They are not as enduring as the stars are. Time and motion are intimately related. The faster is the motion the lesser is endurance in terms of time.
Awareness of time is essentially the awareness of change. We are aware of changes in the external universe. We measure such changes by a physical clock. This gives us an appreciation of the physical time. When we shut out the external universe by closing our eyes, we continue to be aware of our internal universe of thought. We promptly become aware of changes in thoughts. This gives us an appreciation of the mental time. We find the experience of mental time to be different from physical time.
When substance condenses its endurance increases. This is reflected in motion slowing down. For example, matter is a highly condensed substance compared to light because its consistency is higher by many orders of magnitude. This is reflected in the free motion of matter being much slower than the free motion of light. Compared to light, the free motion of thought is expected to be higher by many orders of magnitude.
From thought to radiation to matter, we see time becoming more solid (enduring). It amounts to the increasing of the frequency of substance. Matter has the highest frequency. The frequency of radiation is lower by many orders of magnitude. The frequency of thought is still lower by many orders of magnitude. Black holes at the center of galaxies may constitute the most persistent substance of near infinite frequency. Science views time mathematically without associating any substance with it.
The planets, stars and galaxies are enduring. The environment of radiation and thought around them is changing much more rapidly.
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