Joe Fischer wrote:
On 26 Nov 2005 10:03:50 -0800, " wrote:

Hey,I've been reading Einstein's book "Relativity".
I'm stuck on light travelling at a constant, whether or not the
observer or emitter is moving.
What exactly is it travelling 3000000km/sec relative to? What frame of
reference are we using?

The instrument doing the measuring. All other aspects are infered
or assumed from spectra and other data.

PS. I'm a high school senior.

There are other things to consider besides "speed".

The word "relativity" should give anybody a clue that
there are no absolute references or anything to index an
absolute reference frame to.

I don't have that much math/physics under my belt.

I don't either, but everything I have done requires
some aspect of physics, electronics, electromagnetism,
mechanics and hydraulics.

I would highly appreciate it if you keep that in mind in your
explanation.

Don't accept the explanations given by anyone that
claims "relativity" is wrong, this newgroup is infected by
many different kinds of pests that want to tell the world
what big egos and small IQs they have. :-)

The constant c is merely the value "measured"
by every accurate experiment, and nothing more than
that should be considered a "fact".

here are we have a problem, tha measurements of the
detectings are electrons, which dont propagates but
vibrate, so c is if you wish is a delay not speed, its tha
time it take to the surrounding electrons to start vibrating


The only way the constant c could vary is if
gravity has some effect, but in all the confusion here
caused by so many different opinions, mostly negative,
it is difficult to tell even what the best text books say.

Joe Fischer P.S. Be sure not to send the same message twice.