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There is no constant rhythm or background beat; the time signal is conjured as needed.

When it’s dark, we produce melatonin, which acts as a time signal to the body, telling it we should be sleepy.

Depending on where you are in the United States, those frequencies will bring you to WWV and WWVH, two extremely accurate time signal stations.

He did not own a working clock; generally he depended on the TV for time signals, but today was Interspace Horizons Day, evidently.

They do this using time signals from GPS satellites’ ultra-precise atomic clocks.