The obvious answer is drawing from the popular understanding of Stonehenge being related to the equinox and of druids being way into stargazing, but is there a Wizard Zero for these motifs? If so when did they show up?
I am not trying to limit discussion but /u/TheLionHearted answered a similar question recently:
Let's get down on Isaac Newton for the stars and moons. I think the previously discussed answer about the shape and type of the hat has been answered, but the symbols on the hat aren't related to stargazing and astronomy, not exactly. They are related to alchemy, which, in incipient years, was seem as a brother science to Astronomy. Alchemists at this time would have been visually referenced by the symbols they used, and these symbols would have correlated clearly to both planets and stars. Both the literal 'these look like stars and moons' and also 'these symbols are for mercury, copper for venus, and gold for the sun", as that was sometimes believed as to the origin for those base metals. As with all things alchemy, the base of this is often in dispute, but the symbolism and look of stars, moons, and symbolism of things denoting 'a robed man with a stars and moons who is familiar with the esoteric and arcane' is almost certainly a reference to a alchemist.
"Like most alchemists, he employed the planetary symbols for the known metals, and used standard symbols for common substances such as sal ammoniac (ammonium chloride), salt of tartar (potassium carbonate), vitriol (iron and copper sulfate), and the strong acids."
http://webapp1.dlib.indiana.edu/newton/ http://webapp1.dlib.indiana.edu/newton/reference/symbols.do