Gibbous Moon

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There was a lot of mist around, but a few stars were visible overhead and there was a gibbous moon in the sky. Tiffany knew it was gibbous because she’d read in the Almanack that ‘gibbous’ meant what the moon looked like when it was just a bit fatter than half full, and so she made a point of paying attention to it around those times just so that she could say to herself: ‘Ah, I see the moon’s very gibbous tonight’.

It’s possible that this tells you more about Tiffany than she would want you to know.

Terry Pratchett, “The Wee Free Men”