All of us in early childhood know that in day 24 hours. But did you know it was not always so and once upon a time dinosaurs were significantly less awake than us? This is because millions of years ago the Moon were much closer to our planet, causing the Earth to rotate faster. As a consequence, to the change of day and night took less time than it is now. Recently, scientists decided to calculate exactly how many hours lasted the day in the time of dinosaurs. In this they were helped by the fossilized remains of an ancient mollusk, the structure of the shell which changed every day. In fact, the scientists calculated the duration of the days of the days of the dinosaurs, as the thickness of the rings in the barrel is determined by the age of the tree.
On the conducted research and its results were described in the scientific edition of the New Atlas. At the disposal of scientists were the remains of the ancient and has long been extinct mollusk species Torreites sanchezi. Researchers already know that every day on the shell of these tiny creatures formed a new layer of mineral known as calcite. After examining the fossilized shells, the shell of which in the daytime was changing faster, the scientists found that at the time of the dinosaurs the day was 23.5 hours.
Duration of millions of years ago
Since 70 million years ago each day was half an hour shorter per year were placed as much as 372 days. That is, if the dinosaurs celebrated new year, they would celebrate a week later than we do. Over millions of years, the length of days increased, because every year the Moon is moving away from Earth by about 3.8 centimeters. As one day our planet makes exactly one revolution around its axis, and the distance of the satellite slows down the rotation speed, the duration of the days is gradually increasing. In the end, after millions years since the extinction of the dinosaurs, in a day we have 24 hours.
The duration of the day a billion years ago
It should be noted that before the appearance of dinosaurs, about 1.4 billion years ago, day lasted only 18 hours. Then the Moon was very close to our planet and forced Earth to rotate faster than it is now. This became known around 2018, and learn more about the study can be read in the scientific journal Science.
It is noteworthy that the length of day from year to year is still increasing. However, we can not feel it, because the days are getting longer by 1.8 milliseconds approximately 100 years. So, we can assume that after a few hundred centuries, the days are especially long. Just see if we can catch this time or not is unknown, because some scientists predict that in 2050 we will reach the point of no return and the planet will start to die.