SRT is theory about relativity of motion, of every motion (!),
including the motion of quantum of light. (!)
The reason of this motion is spin.
Four physicists discovered spin effect :
Planck, Einstein, Goudsmit and Uhlenbeck.
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Planck explained the spin by formula: h=Et. ( 1900)
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Einstein explained the spin by formula: h=kb. ( 1905)
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Goudsmit and Uhlenbeck wrote the spin by formula:
h = h/ 2pi. (1925)
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How is possible to understand their work?
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Israel Socratus.