1. I was reading some more about the hafele keating experiment wondering what the referenceframe is for determining the speeds of the three clocks.

What determines that referenceframe so to say. What I read it was the center of the earth.

A center is a point. But a rotating speed is determined by an angle speed. So I need two lines. For the clock at the airplane there is one line between the clock and the center. But what is the other line ? An angle-speed relative to a point is belony. And without an anglespeed there is not a speed determined in this case as the distance is more or less constant.

It is obvious that that other line is given by the line between the sun and (the center of) the earth. Obvious because the speed of the clock is calculated from day-night cycle and circumference of the earth and that means the referenceframe is also determined not by the center of the earth but by the imaginary line between sun and earth.

Therefor the observations done with that experient are for a raferenceframe attached to that line. and thus for a person who is static to it.

Hence it represents a very particular frame of reference because there are a multitude of possible lines....the moon, a star of which there are billions etc.

A preference for a line that determines a referenceframe automatically means a preference for a specific frame of reference.

So what is the real reference frame used to determine the speed of the clock at the airport (and from that for the other clocks) ?

2.

3. To put it together the question is what is the referenceframe of the clock on the airport defined by ?

As there is no change in distance (ds/dt) between this clock or the others and the center of the earth a speed of this clock can only be defined if there is an anglespeed. The referenceframe therefor can,t be determined just by the center of the earth.
As the speeds (ratio of distances in meters and seconds)) are calculated using a twenty-four hour cycle of the earths rotation the other line (beside the line from center earth to the clock) must be the line connecting the center of the earth to the sun as a days cycle is related to the sun.

Hence the speed of the clock at the airport would be for a person in rest with this line (?).
Being at rest with that line you need to travel the earth like Phileas Phogg but then in 24 hours instead of eighty days.

The pilot of the plane that flew east to west could do that maybe or approximately has.

It would not change the differences in speed between the clocks but it would change the speed of the clocks.

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