Thanks to Einstein’s relativity, time flows differently on Mars than on Earth. NIST scientists have now nailed down the ...

Come Sunday, Nov. 5, many Americans may lament the loss of an hour of sunlight in the evenings as clocks are set back an hour, and Daylight Saving Time ends. The practice has long been controversial.

This year’s fall reset of our clocks back an hour appears to have permanently changed the morning rising time for our 14-year ...

Twice a year, every year, the ritual returns as literal clockwork: the start and end of daylight saving time. Millions of Americans, with grunts or glee, tap at their devices or wind their watch hands ...