In sci.physics, TomGee

wrote
on 17 Aug 2005 22:06:35 -0700
.com:
No, Ghost, we don't travel through space-time, we only travel through
space _and_ time. Biiigg difference cause s-t is a math construct and
not of this world.


If one wants to be pedantic about it, you are of course correct.
The worldline of a moving point particle is a curved line in a
4-dimensional continuum -- which we cannot visualize except through
various means such as taking 3-dimensional slices thereof.

(The line is curved if there is mass in the vicinity warping things.)

The worldline of a *stationary* point partidle is also a line; there's
some issues as to whether anything really can be stationary in light
of the absence of any real absolute origin.

I'm sitting in my chair. Relative to the Earth's center I am
moving along a latitude line of about 37° 22', giving me a
velocity component relative to the Earth's mass-center of
about 368.6 m/s. The Earth's motion around the Sun is
about 29800 m/s. The Sun's motion around the Galaxy is
unclear, with quite a bit of wobble. The Galactic Core is
probably moving as well relative to -- something.

What is my timespace worldline doing, really? :-)

--
#191,
It's still legal to go .sigless.