MeteorWayne - That fast, or - er - slow?<br /><br />That would be quite a bit since earth was created some 4.5 billion years ago!<br /><br />And it would be quite a bit more by the time our sun goes red giant - assuming (which I don't btw) current stellar evolution models are correct for our sun.<br /><br />I thought the change was much slower than that, such that earth will have a 25 hour day in 5 billion years or so.<br /><br />Let's see - 2 minutes in 10,000 years; 20 minutes in 100,000 years, 200 minutes in 1 million years, 200,000 minutes in 1 billion years.<br /><br />Now, 24 hours is 14,400 minutes?<br /><br />So, 1 billion years ago earth's day was how long?<br /><br />I assume that would not be negative time!!!!!!