Journey to India

We hear time is linear, and then that perhaps after some recent very
fuzzy physics, that time is not linear after all, and so I ask what is
it time might look like. I got to thinking one night, late at night,
before dropping off to sleep, or perhaps in the middle of the night,
that perhaps time is circular. That is, that time goes around and
around, repeating all the moments, repeating the history, but on such
a large scale, that none of us can really ever grasp it. I dont' mean
that history repeats itself in the usual way that is said. I mean
literally every single thing happens again because we go all the way
to the end of time, or at least the very furthest we can imagine, but
there is no edge, as it bends back onto itself, joins up with itself,
and starts all over again. I don't know how long that cycle could
be... it could be millions or billions of years, or two seconds, or
some unit of time that is not measurable in our usual way, but
nevertheless quantifiable in some way. There is a precedent. People
used to think that the world was flat, and that at the end you would
fall off, or before people traveled very much, that at the very least,
the world was flat and went on forever. Then eventually it came to be
that we figured out that if we kept going we would find ourselves back
to where we came from. I would like to know if this could be possible
with time.