Equinox mo (4)

I think it could be either:

Which length description are you looking for?:

sept

(Other definitions for sept that I've seen before include "Part of clan" , "Month (abbreviation); clan subdivision (in Ireland)" , "Irish family group" , "Thirty days" , "Division of a tribe in Ireland or Scotland" .)

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

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