I’m pretty sure that I learned the word “equinox” from a comic book: Marvel Team-Up #60, dated Aug. 1977.

Panel from Marvel Team-Up #59 © 1977 Marvel. Script: Chris Claremont.
Pencils: John Byrne. Inks, Colors: Dave Hunt. Letters: Bruce Patterson.
Okay, I might’ve actually learned it from the previous issue, MTU #59. But #60 has
the antagonist of the story, Equinox, on the cover. It didn’t feel right to have the big splashy image leading off a post about Equinox not be a picture of Equinox. [Note: As you’ll see, I’ve since been able to include a scan of an interior panel from #59.]