(Latin). The sun.
“And when Dan Sol to slope his wheels began.”
Thomson: Castle of Indolence, cauto i.
Sol. The term given by the ancient alchemists to gold. Silver was luna. Sol in the Edda was the daughter of Mundilfori, and sister of Mani. She was so beautiful that at death she was placed in heaven to drive the sunchariot. Two horses were yoked to it, named Arvakur and Alsvith (watchful and rapid). (Scandinavian mythology.) (See Mani.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894