Tech & Science The animation of a scientist shows that there are two types of days on earth: man uses the one who is 4 minutes longer

09:15  18 may  2021
09:15  18 may  2021 Source:   businessinsider.de

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He made the below animation to show how this works. Because we go by solar days in our calendars, we count 365 days in a year. But Earth actually completes a full rotation (a sidereal day ) 366 times per year. O'Donoghue describes the difference between these two types of day as a matter of choosing which background object we use as a basis If we used the sidereal day instead, "the sun would rise about four minutes earlier every day ," O'Donoghue said. "After six months of doing this, the sun would be rising 12 hours earlier." He added: "We've decided to tie our daily rhythm to the sun, not the stars.

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How long does it take until the Earth has completed a 360 degree rotation? No 24 hours, as it turns out - it's exactly 23 hours and 56 minutes.

Since the earth is constantly moving on their orbit around the sun, the sun at the end of this 360 degree rotation is not the same point on the planet. So that the sun reaches the exact same position in the sky, the earth must turn a degree further.

Humanity has decided not to measure the days on the basis of the exact rotation of the earth, but with the position of the sun in the sky.

actually turns the earth 366 times a year

These are two different types of days. The sidereal day is measured by completing a 360 degree rotation. A day based on the stand of the sun is referred to as sunday. The latter is four minutes longer and therefore takes exactly the 24 hours to which we are used to.

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"Just because we move around the sun on the orbit, the sunty is 24 hours," said James O'Donoghue. He is planet researcher at the Japanese Space Authority Jaxa. "Would not we circle the sun, both days would be long."

He made this animation to show how it works:


In our calendars we go to sunny days. For this reason, we count 365 days a year. In fact, the earth performs 366 full revolutions (sidereal days) per year.

It depends on the comparison point of rotation at

According to O'Donoghue, the difference between these two types of day is a question of comparison point for the earth-rotation. A full turn in relation to the state of the sun is a sunny day. A full revolution in relation to all other stars we see is a sidereal day.

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On the day itself, he makes notes every 15 minutes to half an hour detailing where he is and what he’s doing – whether that is a simple metro journey, a class at his university or an interview with a journalist, like me. “I’ll write down now that I'm speaking to you. Villarroel is part of a growing community of ‘self-trackers’ who meticulously collect data on their lives in the pursuit of greater self-knowledge. Once the notebook is filled up, he’ll carefully index its contents in Microsoft Excel and move on to the next one .

We would use the sidereal day instead, "the sun would rise about four minutes earlier every day," explains O'Donoghue. "After six months, the sun would rise 12 hours earlier."

he added: "We decided to align our daily rhythm after the sun and not to the stars. In fact, the stars go on for about four minutes earlier every day," says O'Donoghue.

  Die Animation eines Wissenschaftlers zeigt, dass es auf der Erde zwei Arten von Tagen gibt: Der Mensch nutzt den, der 4 Minuten länger ist © Provided by Business Insider Germany

This article appeared in Business Insiders already in November 2020. It has now been checked again and updated.

Sunrise over Planet Earth © Tetra Images / Getty Images Sunrise Over Planet Earth

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