How long is a day?

And was it different 2000 years ago? 10000? Will it be different 4000 years from now. If so, much differnet for all?

According to Wiki

ETA: Doh! Gotta work on my speed searching. :slight_smile:

What’s three minutes among friends? :slight_smile:

You might want to consider the sidereal day which is purely the amount of time it takes the Earth to make one revolution on it’s axis, 23h 56m 4.090530833s according to Wikipedia. That’s the number that has been varying over the last 4.5 billion years as the Earth’s revolutions have slowed. The other 4-ish minutes are due to the Earth moving relative to the sun, which is a separate issue.