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This tag is for questions on the meaning, history, and usage of various symbols and notation that are used to denote different quantities in physics. Don't forget to mention the reference, where you encountered those notations.
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I cannot understand $\tau_{see}$ means in the question
τ_see is the time Q records between the clock reaching A and the clock reaching B.
Since photons take time to travel, the clock is already far past A by the time Q sees it. B is closer to Q so the pho …