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The 120 MPH is our relative speed. It is a closing speed between us. You have no idea of what component velocity each of us has relative to the road. You only know that the distance between us is decreasing at the rate of 120 MPH. That says NOTHING as to each of our speeds along the road.

Oh good, I was hoping you could help me figure this out: I am traveling along a road and you are traveling towards me in the opposite lane. Our relative speed is 120 MPH coming towards each other. There is a Home Depot located exactly at the mid point between you and me at t=0. The distance to...

You telling me our relative speed is 120 MPH when I don't know your speed or my speed is the very definition of meaningless.

Apparently you are wrong, the source (red dot) doesn't stay at the center of the light sphere, as depicted by this Doppler scene. Do you notice the lengths of the red lines are different? What's that all about?? (rolls eyes)

Did you even bother to look at my diagram? It clearly explains the concept. Do you see a light sphere? Do you see the source? Do you see that the source is no longer at the center of the light sphere after it emitted light? Are you denying that is accurate?

Me to you: Measure my speed. You to me: OK, we have a relative speed of 120 MPH Me to you: No, I mean tell me my speed, not our relative speed. You to me: You don't have a speed, only we have a speed. :wall:

Let me get this straight. I am standing 10 feet away from a tree. Lightening strikes the tree. The earth (and the tree and I) moves after the lightening strike occurs. The tree was at the center of the light sphere at t=0. The earth and tree moved after t=0. Are you saying that as the tree moves...

If you want to measure the speed of light then you need to measure the radius of the light sphere, period! Correct, I will take that closing speed measurement and use it to determine the real speed of light. I am measuring my velocity in space in the preferred frame when I take that closing...

Looking real nice. I'm at day 18 of 12/12 now, so about 10 days behind you. Please tell me she stopped stretching by day 28?? I'm running outta room at day 18. Mine is about 10" above the screen. Did yours stop stretching at 16.5" above the screen? I can manage that, but not any more than that..

She did not see the strike hit the nose, the only thing she knows is that the clock stops when the photon from that direction hits her. She doesn't see anything, as when the photon impacts her the measurement is complete. ...and here's the kicker, the clock stops when the photon hits her, but...

Look, I don't know how to say this any other way to get my point across. If you actually measured the speed of light, then why would you expect to get any other reading besides 299,792,458 m/s? I mean, if you ACTUALLY measured the SPEED OF LIGHT, and light always travels at c, then how is it...

Yes it can differ, I showed you how in my diagram.

Yes the trains do see the lights from the other train (assuming the tracks to be at a zero velocity), because the speed of light is 299,792,458 m/s along the tracks, and the trains are traveling in opposite directions at 200,000,000 m/s. The speed of the trains is not a factor in the speed of...

And what is the track's absolute velocity? If I laid a meter stick on the tracks and measured the one-way time of light travel in each direction would the times be the same?

If the lady on the train knew the flight time of light then she would know that when the lights impacted her at different times in the first scenario that the strikes occurred simultaneously and had different light travel times. So what ground would she have to stand on if she knew the flight...

The points of origin of the light spheres do not share the motion of the train. The points of origin are incapable of motion. They are a point in space. Just because the lady is sitting midpoint in the train doesn't mean she remains midpoint of the points of origin of the light spheres. The...

Basically this is what you are saying: You are standing at the 50 yard line of a football field. Two footballs, one from opposite directions hit you at the same time. You don't know how far the footballs traveled to reach you and you don't know how much time they were in flight, you simply know...

If the radius of the light spheres were the same when they impacted her simultaneously at the midpoint then the time of light travel was the same, and the distances were the same, so yes, she would be at an absolute zero velocity. If she was in relative motion to the tracks then the tracks...

In chapter 9 there is only one point in time that the marks align and the strikes occur. It is 100% correct to say that it is impossible for 2 strikes to occur at different times if they both occurred when the marks where aligned. Einstein himself set up the scenario with the tracks having an...

In scenario A the embankment observer was at an absolute zero velocity. He is correct to state that the strikes occurred simultaneously. After the strikes hit him simultaneously he runs to the next platform and gets there before the train. When he started to run he accelerated to a velocity...