The three sources of heat

«For ’tis demonstrated in Natural Philosophy, that there is no other cause of Heat than Motion, or else the Contact of hot Bodies, or Light. ‘Tis also prov’d  that the Sun, in itself, is not hot, nor partakes of any Quality of Temperature (…)».

– Ibn Tufail, “Hayy ibn Yaqzan” [Alive, Son of Awake]

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