5 Based on these data what would astronomers predict the len

5) Based on these data, what would astronomers predict the length of the day was approximately 390,000,000 years ago?

Solution

ANS:

The length of day on earth is increasing slowly from 4.5 billion year history. This hypothesis is first formulated by Dr Rosemary Mardling.

Dr Rosemary Mardling explains the moon is attempting to slow down the spin of the earth is the main reason behind increasing the day time on earth.

In early time the spin of earth is much faster when the Moon was formed. The earth spin down rate is two milliseconds per century.

Geological evidence is also proven this hypothesis. Tidal records in the period of ancient estuaries can show sand and silt deposition indicates indicate that 620 million years ago the day was 21 hours.

390,000,000 years ago means 390 million years, it is the time between the Devonian (400 million years) to (carboniferous 300 million years). So the astronomers predict the length of the day was approximately would have been longer than 21 hours and probably closer to 23 hours.