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Why do we calc speed like here and here? What I'm talking about is where the speed of an object is calced by comparing how fast it moves onscree (this is pretty important) to how another object with an assumed speed moves on screen. This can't be valid. Isn't this calc stacking? Can we calc the speed of stormtroopers running by scaling how fast they run on screen compared to how fast blaster bolts move on screen? Are normal people in star wars now supersonic? It makes no sense. I know joshless isn't exactly the most reliable source, but he explains this pretty well here if I missed something in my argument.
Also a verse specific thing for the touhou calc, we can't just assume that the so called "photon attacks" are moving at the speed of light. In real life, photons can act as if they are bound together like atoms and molecules (just like hardlight in sci fi) and for all intensive purposes move much slower than lightspeed. Technically, they are still moving at lightspeed, but they move in really tangled paths and stay in the same place. These articles are the sources.
Also a verse specific thing for the touhou calc, we can't just assume that the so called "photon attacks" are moving at the speed of light. In real life, photons can act as if they are bound together like atoms and molecules (just like hardlight in sci fi) and for all intensive purposes move much slower than lightspeed. Technically, they are still moving at lightspeed, but they move in really tangled paths and stay in the same place. These articles are the sources.