[guest4091]

From a Wiki page, july 2006:

"1. Relativity theory depends on reference frames. A reference frame is a point in space at rest, or in uniform motion, from which a position can be measured along 3 spatial axes. In addition, a reference frame has a clock moving with the reference frame, allowing the measurement of the time of events.
An event is an occurrence that can be assigned a single unique time and location in space relative to a reference frame: it is a "point" in spacetime."*

"2. Let's define the event to have space-time coordinates in system S and in S'."

[1. Events are physical occurrences, and measurements allow recording spatial position and time of events.]   

[2. Is not defining 'event', but properties of an event for identification purposes. The coordinate transformations calculate the coordinates of the S' frame from the S frame.
S and S' observe the same event, but with different coordinates, therefore the coordinates cannot be the event. The spacetime point is an abstraction or figure of speech, just as a trajectory, orbit, etc., i.e. a perception with no physical reality outside the mind.]

* This sentence is ambiguous. "it" is not redefining 'event', but defining 'point' as corresponding to the coordinates of the event. Option 2 would be to call the sentence a contradiction of terms. The time coordinate is in reality, a simultaneous clock event.
 

[Colin2B]

An event is an occurrence that can be assigned a single unique time and location in space relative to a reference frame: it is a "point" in spacetime."*

* This sentence is ambiguous. "it" is not redefining 'event', but defining 'point' as corresponding to the coordinates of the event.

It’s not at all ambiguous, it just conflicts with your own ideas.

The spacetime point is an abstraction or figure of speech, just as a trajectory, orbit, etc., i.e. a perception with no physical reality outside the mind.]

Try standing on an object’s trajectory and tell us whether the impact you feel is an abstaction.

@PmbPhy and @Halc are not going to repeat that your definitions are wrong, but that doesn’t make yours right.

[PmbPhy]

PmbPhy#60;
How can you assign a coordinate to empty space, i.e. without a reference object? Distance, time, and motion are only relative to a reference frame, in SR.

I don't think you can in practice. Typically a coordinate system is defined by using a reference. But that doesn't mean that space is filled with stuff.