Currently I\'m 17 years old, going to secondary school. So, my ideas might be to

Question

Currently I'm 17 years old, going to secondary school. So, my ideas might be totally wrong...
I know that everything is relative. In the example of speed, the earth moves, and the galaxy moves, etc.

My physics teacher told me that the speed of light is absolute, which means that the speed of the light source doesn't influence the speed of light in space. So, I was thinking that that fact could helps us to measure the absolute speed of our planet in space. Not relative to the sun, or the galaxy.

The way of measuring it was following:

A is the light emitter.
B is the light sensor, in combination with a very very precise timer.
D is the signal broadcasting point.
~~> is light, going from A to B.

A ~~~~~>~~~~~~~>~~~~>~~~~~>~~~~~~~~>~~~~~~>~~~~~~~~~> B
__________________________D_________________________/

So, how it works

Explanation / Answer

Suppose two light pulses are released from A and B in opposite directions at the same time. Clock A

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