Primum mobile

This post is part of the A to Z Challenge. My theme for the month is A to Z of words in English with an Arabic origin.

….thus starts some of the difficult alphabets. Yet, I learnt a new word in doing my research for this challenge.

Primum Mobile –  (Astronomy) the outermost empty sphere in the Ptolemaic system that was thought to revolve around the earth from east to west in 24 hours carrying with it the inner spheres of the planets, sun, moon, and fixed stars.
Also means prime mover.

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