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If sightless, how might one detect the speed of any of those waves since the basis for the determination was the study of light?
I don't know how they would differentiate "cold heat" from room temperature in a dark room.
Further, I don't see (sorry) how they could differentiate heat from a nearby source compared to that of a distant source without an additional stimuli like smoke, or the sound of a fire crackling. Lacking the additional stimuli sometimes accompanying a "nearby" source of heat it would seem impossible to determine the distance to the source, thus no ability to calculate speed.