Timely midpoint unchanged after revolution (4)

I believe the answer is:

noon

I believe this clue is a double definition.

'timely midpoint' is the first definition.
(midday)

'unchanged after revolution' is the second definition.

(Other definitions for noon that I've seen before include "Twelve o'clock in the day" , "when only mad dogs go out?" , "[LUNCHTIME] ?" , "The middle of the day" , "See 8" .)

I've seen this clue in The Times.

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