As suggested in my introduction, "What is
Truth", I (and most philosophers) believe
that truth is unchanging. Reality is
something determinate, and although it
changes over time, what is true at a
single time doesn't change.

The world does change over time and in
order to correspond with reality (be true),
beliefs must change, too. So in this trivial
sense, truth is ever-changing. But if you
think about truth as the sum total of
propositions that describe the world at
one single moment in time, those don't
change. All the things which were true
about October 1st 8:00 PM will always be
true, though we may be ignorant or
mistaken about which of those
propositions are true.

What the majority believes is true
changes over time, but does that
necessarily mean that "truth" changes?
For a long period of time, most people In
Europe believed that the sun revolved
around a stationary earth, which they
believed to be the center of the universe.
Did that make it true? Or did those people
merely have a justified but false belief?

Prof. Borrowdale