Comment by lifeisstillgood
2 days ago
So, if my maths is right that’s about 1 second extra slower every 500 days, which means a day will take 48 hours in about 43 million years
That seems very very fast on galactic time scales - we would get tidally locked (rotate at speed of orbit?) in about 150x43 million … oh about 3 billion years … yeah never mind
Edit A slightly different way of looking at it is we add a leap second every 2 or so years on average (27 in past 53 years). This seems about right with the above maths - it just amazes me
What amazes me more is they are going to stop using leap seconds https://en.m.wikipedia.org/wiki/Leap_second by 2035
No, it's 2.3ms per day slower every 100 years. After 100 years the cumulative "loss" would be 100365.25(2.3/2), or about 11 hours, but each day would be about the same length as it is today.
If rotation was 86400 seconds per day today, then in 100 years time it will be 86,400.0023 seconds.
In 1,000 years time it will be 23ms slower
In 10,000 years time 230ms slower
In 100,000 years time 2.3 seconds slower.
In 1 million years 23 seconds, a 86400s day will take 86423 seconds
In 43 million years at that speed of 2.3ms per 100 years, a day will take 86,989 seconds, or 24 hours 16 minutes.
(there are other factors effecting earth's rotation)
An interesting similar thought is to work out the length of a day during the Jurassic period