We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Time is how we measure change. Change is real/objective. Our mind perceives change from what we remember to now and our mind projects change into the future. Time is a comparison of the change we perceive to the regular change in other objects -- sun, moon, stars -- days, months, years. With math as a language, we can describe in detail and with precision the rough change and rough comparisons. Time is a mental concept, a mental perception. Time is not a thing.
Since time is a mental construct about change (memory, present, future), it is not possible the reverse the process of the atoms changing position in the material world. Reversing time means atoms reversing their positions within space. For example, a rock weathers ie, losing atoms and molecules. Reversing the change would mean the rock would regrow, reacquire its atoms to its original dimensions.
What if one of the lost rock atoms is incorporated into a plant? To reverse time would be to change the position of all the atoms in everything to an earlier position.
For a person to travel back in time, their atoms would exist in two places -- In the person and their original place. An atom cannot be in two places simultaneously. I don't think even that is possible in Quantum theory.
Not to get all philosophical on you, but philosophers have been debating the "Analytic-Synthetic Dichotomy" for centuries. It's an evil concept, designed to destroy man's mind.
"The assault on man’s conceptual faculty has been accelerating since Kant, widening the breach between man’s mind and reality. The cognitive function of concepts was undercut by a series of grotesque devices—such, for instance, as the “analytic-synthetic” dichotomy which, by a route of tortuous circumlocutions and equivocations, leads to the dogma that a “necessarily” true proposition cannot be factual, and a factual proposition cannot be “necessarily” true." --Ayn Rand, the greatest American philosopher
On a related topic: somewhere I read the proposal that we can describe the world as--"everything moves at the speed of light." Most of the time this motion is in the "time direction," but when something is moving with respect to us, its "direction of motion" rotates to include a spatial component as well as a temporal one.
It isn't that useful for calculations, but seemed an amusing way of thinking about time. And proper time, of course.