"francisco" <paco1955@sbcglobal.net> wrote in message
news:JLB3f.1034$dO2.114@newssvr29.news.prodigy.net...

let A = an observer. and let B = another observer.
let B stand still next to A. let A carry a watch. and let B carry a watch.
let the watch of A be synchronized with the watch of B. in other words,
let A read both his watch and the watch of B. and let A determine that 1 s
by his own watch = 1 s by the watch of B.

now let B move forward at a constant specified speed close to the speed of
light. and let A remain standing still.

now if A is able to read the watch of B, he will observe that (at that
specified speed in which B is moving) 2 s by his own watch = 1 s by the
watch of B. in other words, A will observe that 1 s by the watch of B is
longer than 1 s by his own watch (2 s by the watch of A = 1 s by the watch
of B).

it is the same as if we say that 2 pesos = 1 dollar. in other words, it
takes two pesos to make one dollar. so, the same applies in this case of
relative time: according to observer A, it takes 2 s by his own watch to
make 1 s by the watch of B.