Tides slow down the speed of rotation of the Earth around its axis by 0.0017 s / century. Calculate the duration of the earth’s

Tides slow down the speed of rotation of the Earth around its axis by 0.0017 s / century. Calculate the duration of the earth’s day 200 million years ago, if now it is 23 hours 56 minutes 04 seconds.

1) Determine the time for which the day was shorter:
0.0017 s / century × 200 million years = 0.000017 s / year × 200,000 years = 3400 s = 56 min 40 s
2) Let us determine the length of a day 200 million years ago:
23 hours 56 minutes 04 seconds – 56 minutes 40 seconds = 22 hours 59 minutes 24 seconds
Answer: 22 h 59 min 24 s

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