“So, if I just wait a few hundred million years, I’ll get that extra hour back,” Meyers joked.
The moon moves further away as the Earth's rotation gradually decreases, The Guardian reported, and over the past 1.4 billion years the moon has drifted more than 27,000 miles from the Earth, according to the study. It's now almost 239,000 miles away. The closer the moon was to the Earth, the stronger it's gravitational pull.
Meyers calculated the numbers by using astronomical theory and geochemical signatures in ancient rocks to show that a day on Earth was once 18 hours and 41 minutes.
Scientists, like geophysicist Kurt Lambeck from the Australian National University, told National Geographic that the Earth's spin has been slowing for billions of years because of the drag the moon has on the tides. The drag slows the Earth's rotation by about 1.78 milliseconds every century, enough to add up over billions of years and lengthening Earth's days.