Here's the reason behind it. https://physics.stackexchange.com/questions/228508/why-does-william-herschels-experiment-show-red-light-as-warmer-than-blue … (My previous answer was wrong.)
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Why did he need to record room temperature? What was the original experiment?
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Logically, measuring room temperature will allow you to determine the difference in temperature for the other colours. Therefore, it is likely that he wanted to know which colours carry what level of energy (heat in this case.). I'm using a technique called inference here.
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Well, A true Genius Lies in Innovation.https://twitter.com/fermatslibrary/status/1077238853520556035?s=19 …
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IIRC, in the new A Spacetime Odyssey,
@neiltyson told Newton discovered infrared light like this. -
Newton almost did. It later went on that William Herschel did.
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No overt idea, but I would guess it was someone from roughly the same era as Herschel. Perhaps the intense interest in optics for telescopes at the time played a part.
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Similarly, Khaar Jesnit of Bangalore (1603-68) discovered something akin to ultraviolet light by sunbathing next to the Ganges wearing little more than a loincloth and walnut shells to protect his eyes. Severely burned he used his chemistry skills to manufacture Coppertone.
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Hi Any link to Khaar Jesnit??? Strange that neither Google nor Bing threw any clue on this !!!!
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