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17 Hours – It Is Also
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During the Mesozoic Era (252 to 66 million years ago), the world spun on its axis once every 23 hours. Turn the clock back 1.4 billion years ago—a cool billion years before life on Earth really took off—and a day was only 18 hours and 41 minutes long.
around 24 hours
On Earth, a solar day is around 24 hours. However, Earth’s orbit is elliptical, meaning it’s not a perfect circle. That means some solar days on Earth are a few minutes longer than 24 hours and some are a few minutes shorter.
For Jurassic-era stegosauruses 200 million years ago, the day was perhaps 23 hours long and each year had about 385 days. Two hundred million years from now, the daily dramas for whatever we evolve into will unfold during 25-hour days and 335-day years.
In this calendar, a common year is 365 days (8760 hours, 525600 minutes or 31536000 seconds), and a leap year is 366 days (8784 hours, 527040 minutes or 31622400 seconds).
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