Why Are There 365.242199 Days In a Year?



Episode 4 of 4

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A year on Earth is 365.242199 days, which makes using a calendar extremely difficult. So who were the first to try it and how did they account for the extra time?

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Previous Episode:

Why Is October Not The 8th Month? Think About It.:

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Sources:

Why Planets Orbit The Sun:

“In ancient times, astronomers thought that all celestial objects – the Sun, Moon, planets and stars – orbited around the Earth in a series of crystal spheres. But as modern science developed, astronomers were better able to understand our place in the cosmos.”

The Explanatory Supplement To The Astronomical Almanac:

“The book is a detailed reference text to the algorithms and theories used to produce The Astronomical Almanac. It covers the history, significance, sources, methods of computation, and use of the data presented in The Astronomical Almanac.”

The Surprising History Behind Leap Year:

“It’s that time again: This Monday, February 29, is a leap day, the calendar oddity that occurs (almost) every four years. For centuries, trying to sync calendars with the length of the natural year caused confusion—until the concept of leap year provided a way to make up for lost time.”

Muslim Calendar:

“Muslim calendar, also called Hijrī calendar or Islamic calendar, Ramadan: meal preparations dating system used in the Muslim world (except Turkey, which adopted the Gregorian calendar in 1925).”

Are Earth Years A Bit Weird?:

“To us, a year lasts 365 days. Aliens, if they exist, may have quite different attitudes to time. That’s because some planets have much shorter years than Earth’s, while others are vastly longer.”

How Long Does It Take Our Sun To Orbit The Milky Way’s Center?:

“One journey of our solar system around the center of the Milky Way galaxy is sometimes called a cosmic year. That’s approximately 225-250 million years. The planets in our solar system orbit around the sun.”

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DNews Plus is built for enthusiastic science fans seeking out comprehensive conversations on the geeky topics they love. Host Trace Dominguez digs beyond the usual scope to deliver details, developments and opinions on advanced topics like AI, string theory and Mars exploration. DNews Plus is also offered as an audio podcast on iTunes.

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