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1
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2nd hardback edition.
Abū Yaʿqūb ibn Ishāq al-Kindī (c.800-870CE) De Radiis (On The Stellar Rays) proposes that all things emit rays that operate on all other things, producing an interplay of causes and effects from the stars down to material objects. The rays pouring down from the celestial harmony of the stars, constellations, and pl...