If you've been grumpy about the days getting shorter as we approach June 21's winter solstice, think how much gloomier it would have been if we'd existed 1.
At that point in our planet's history, scientists say, a day on Earth lasted just over 18 hours. The US geoscientists behind a just-published study, and who have also just been collaborating with New Zealand researchers, have further explained how our days are slowly getting longer.
The study, featured this week in the scientific journal Proceedings of the National Academy of Scienceshas reconstructed the deep and intertwined history of Earth's relationship with the moon.
Its authors explained a day lasted three quarters as long xxxpic free. The study described a statistical method that linked astronomical theory with geological observation - called astrochronology - to look back on Earth's download sexy hindi story past, reconstruct the history of the solar system and understand ancient climate change as captured in the rock record.
Earth's movement over space is influenced by the other astronomical bodies that exert force on it, like other planets and the moon.
This helped determine variations in Earth's rotation around and wobble on its axis, and in the orbit Earth traces around the sun. These variations were collectively known as Milankovitch cycles and they determine where sunlight is distributed on Earth, which also means they determine Earth's climate rhythms. Scientists like Meyers have observed this climate rhythm in just rock record, spanning hundreds of millions of years.
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