Hey!
After I noticed there's no aurora tag (request), I thought about it and I noticed there also isn't one for eclipses (solar/lunar). And, while searching for the word “eclipse” likely finds most (if not all) currencies depicting eclipses, there's also some false positives: N#64605 (Club Eclipse), N#64256 , N#77839 […] (Eclipse House), N#47971 (book title), N#230590 (car).
So, while we're at it, why not add a tag for “Eclipse” as well under “Natural phenomenon”? There's plenty of currencies depicting it for it to be relevant, and there's also currencies mentioning the word but unrelated to the phenomenon to justify a tag for it, in my opinion.
Cheers!