Passage of a planet across a star, e.g. (7)

I believe the answer is:

transit

(Other definitions for transit that I've seen before include "Haulage" , "Conveyance of goods or people - tin star (anag)" , "Change" , "The process of going or passing - sic . . . . . . . gloria mundi" , "Travel" .)

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

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