What is ""Убывающая Луна"" in American English and how to say it?

Russian

Убывающая Луна

Убывающая Луна-waning gibbous.svg
American English

waning gibbous

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Example sentences

American EnglishThere's a full moon tonight.

How to say ""Убывающая Луна"" in American English and in 45 More languages.