I found this: Movement and Rhythms of the Stars, p. 59; but I think most of it would be covered in the Wiki linked by Don. (Also, it's been suggested by a knowledgeable source that that particular text might be wanting in places, even though the diagrams are useful).

However, I also found this.

And there's also supposed to be a reference to an analemma somewhere in here, but I was unable to find the precise page.

Hermione
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