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It refers to an even which occurs at the frequency of once every 30 minutes and that the times of occurrence are on the whole hour and at 30 minutes (half an hour) past the hour.

The first part of the sentence gives the frequency (every 30 minutes) and the second gives the phase shift. The latter is to distinguish its timing from an event which takes place every 30 minutes but at 10 minutes and 40 minutes past each hour

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9y ago

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