Trubling aspects of relativity

There's no such thing as a stationary reference frame in the sense that there's no such thing as an absolute frame of reference. All that one can say about such a thing is that there exists inertial frames where such a frame is defined by an imaginary system of clocks and rods. E.g. A Cartesian coordinate system and a set of imaginary clocks spread out through the frame and synchronized with the clock at the origin of the coordinate system. A free particle in such a frame will move at constant velocity. All frames of reference moving uniformly relative to that one is also an inertial frame of reference. There is no absolute frame of reference

Thanks, Phil, yea, Indeed, what I've referred to as an "average"

Still some of our respondents have asserted that the twin paradox might suggest some sort of ref, whether absolute or average

Even Al seemed to be just a little puzzled

I'm sure it's been explained in one resounding posting or another but we need one by common words arranged in usual order, for your Typical Blockhead (me)

I, too, am trubld by relatives.
Mostly, they ask for money.
Then they go in a snit when I tell them I'm broke.

I bear a burdensome beer budget.

Me too Neo. Only 1.14 bottles/day but mostly exotic imports. However the cost is mitigated by visitors who bring also the kinds we like

You might ask, "are those 12-oz"
...to which I reply yes, mostly. However many of the brews they bring in the 17- or 22-oz size; and, well, you can't drink just part of it, can you

Phil, to carry on, last night perusing "Time and the Space Traveler" by L Marder (1970) I got the distinct impression that the matter isn't quite settled