Smiling moon, lunar smile, พระจันทร์ยิ้ม. Whatever.
Astronomers call this phenomenon earthshine, a kind of planetshine.
Thanks to @ifew and the Thai Astronomical Society, specifically this figure, for informing me.
However, my favourite comment on this phenomenon is:
@tpagon: เบื่อพระจันทร์ยิ้มแล้ว -_-
[Trans: I’m bored of smiling moon]
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