Earths day was just 23.5 hours for Dinosaurs?
A team of researchers has discovered that when dinosaurs roamed the Earth, the day of Earth was a bit shorter than 24 hours. Niels de Winter, an analytical geochemist at Vrije Universiteit Brussel lead this study. The study will be published in the journal Paleoceanography and Paleoclimatology, which is published by the American Geophysical Union.
The researchers discovered this fact through a kind of ancient shells that dated back to the Late Cretaceous period 70 million years ago.
These fossilized shells belonged to a group called rudist clams, which grew quickly. they had daily growth records as growth rings in their shells. The species is known as Torreites Sanchezanchezi. Rudist means that they had two shells connected with a hinge.
Laser sampling produced slices of the shells, so the researchers could get an accurate count of the rings. This lets them know how many days were there in a year. By breaking down and doing the math, they could determine how long a day was.
We have about four to five data points per day, and this is something that you almost never get in geological history. We can basically look at a day 70 million years ago. It’s pretty amazing,” said Niels de Winter
according to our knowledge, Earth day lasts 24 hours and it doesn’t change. This is because the Earth orbits around the sun don’t change. But according to this research, No of days in an earth year has changed. It has shortened because the day has grown longer. Moons gravity has resulted in this by drawing the ocean’s tides and slowing Earth’s rate of rotation. Meanwhile, the Moon also distances itself from the earth at a rate of 1.5 inches per year.