What a snake or dragon can represent (5,4)

I believe the answer is:

lunar year

(Other definitions for lunar year that I've seen before include "Period of 354.3671 days" , "some time on the moon" , "Period of twelve new moons" , "Approximately 354 days" , "Period of about 354 days" .)

I've seen this clue in The New York Times.

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