How long exactly is a day

For half of the year, the Sun would be up between 12am and 12pm, and for the other half, it would be between 12pm and 12am. There would be no connection between what time it is, and whether or not the Sun is in the sky.

Can you imagine teaching your children how to read a clock, and then getting them to multiply that by the calendar to figure out when My Little Pony: Friendship is Magic starts?

Better to keep them in the dark, teach them that a day is 24 hours, and deny all knowledge when they get a little older, and start to ask you challenging questions. You already knew that a sidereal day is a little shorter than a solar day, and that everyone else has been living a lie.

Dear Pedant, your life is also a lie. This means that a sidereal day is actually 0. There are other events that can increase or decrease the length of an Earth day. Because of our tidal interactions with the Moon, the length of a day on Earth has increased by about 1. Even as the glaciers melt, the rotation speed slows down a little more. Podcast audio : Download Duration: — 4. Podcast video : Download Duration: — Or is it? It often occurs to me, however, when it comes to reading how long the days are on other planets.

Usually, the days described for other planets are sidereal, and for some planets with very slow rotation, like Mercury and Venus, it makes a big difference. If you look at it that way, his style is not as annoying as it might first seem. This coming from the father of nearly-adult kids who are NOT currently planning to join the community of space-related technicians. A lot of times people will see , e. As the glaciers melt the rotation speeds up.

Think of the classical example of the ice skater. The slowing comes from the massive hydroelectric projects damming rivers i. My opinion is that these hydroelectric projects are a better option than adding a coal fired generator every day, which was occurring because of the large increase in demand for electricity. This still doesn't prove BE, but explains why we aren't facing away from the Sun after 6 months.

Yes you are standing in the dark with your back to the sun but you are looking at the same star you were 6 months ago but couldn't see because the sun was in the way. The day is made 24 hours so when you look at your clock at the same time each day the sun is approximately in the same place, although you may find that your Sundial and watch don't always agree with each other.

You can work out why that is if you read about Kepler and planetary motion, because planets orbit in ellipses not circles and travel at different speeds around the orbit. ShaunTheSheep, i do believe your math is wrong as full revolutions has the same effect as one full revolution; thus you could not have magically have turned an additional degrees unless some unspecified force such as you spinning on your feet spins you.

Please do the math, your statement is false. You are welcome. It is sheer nonsensical, and only works mathematically and not by emperical ovservation. Use your eyes and your brains. The globe model doesn't work. Try to debunk this. Hiding the truth is the greatest evil. I tried to debunk, and now this is why i now know the truth. ShaunTheSheep, think about it another way. Using a sidereal day 23h 56m 4s instead of the current definition of 24 hour day would be great for astronomers.

Imagine that every night in January you go out on your south-facing deck at 11pm and look up and see the star Sirius. Fast forward to July. Since you are using a sidereal day, 11pm is daytime in July. You go out on your south-facing deck at 11pm and point to the exact spot where Sirius is. You know it's there. You can't actually see Sirius because the sun is out, but you know that it's there because on sidereal time the earth is always in the exact same place at 11pm relative to the stars.

With using a 24 hour day as defined by what is practical for normal life, the stars move each night by four minutes so that the sun is high in the sky i. Shaun, you have completely failed to factor in that the sun 'moves' relative to the earth due to our passage around it. Take a beach ball and a tennis ball.

Put the tennis ball Earth on one side of the beach ball Sun and use a marker to draw a viewing location that day at noon, facing the beach ball. Now, simply move the tennis ball to the other side of the beach ball, and sure, the mark will face midnight. Instead, rotate the tennis ball Proving to yourself the earth is a sphere is a simple matter requiring very little effort, the continuing insistence that the earth is flat marks you as either foolish or a troll.

Lol your using a clock that is set at 23h56min to roll they achieve this by playing with how long a second is. Relative to a fixed reference frame outside the solar system the Earth rotates once every 23 hr 56 min, or once every sidereal day. A moving reference frame is not that hard to understand. Sorry also in old days before your watch was a computer. High noon being when sun is straight up.

I hope this helps. Jordan K, what you are missing is simple. It takes 23h 56m 4s for the earth to spin 1 full rotation a sidereal day. Since we are going around the sun it takes roughly 4 mintues longer each day 24 hours for the sun to be roughly at the meridian at noon from day to day.

Having a 24 hour day based on the sun is much more practical than using a sidereal day. If we used a sidereal day 1pm would be daylight in summer and night in winter or vice versa. So the earth spins Nobody HID the actual time and distance that the earth spins in 24 hours. These conspiracy theorists create their own fodder for foolishness. What is not commonly known to the general public regarding the length of a day has been severely simplified to an AVERAGE for the layman.

For in all actuality the motion of the earth is perturbed in its rotation and in its orbit. Is that the unlock code I meed for my Galaxy. Omg i been looking for Give me a quick second and I will see if it works.. Ya never know; Later. But as I calculated it, is just an approximate value, so doesn't it affect the succession of time as it goes by? The reason why, on Earth, the length of a sidereal day is 23 hours, 56 minutes and 4.

For everyday purposes, the solar day is the thing to use because it correctly reflects the apparent period of revolution of the sun. However, for more technical purposes where the Earth's rotation relative to other celestial bodies is concerned, the sidereal day is more useful because it reflects the Earth's actual rotation. The day consists of hours, an hour for minutes, a minute for seconds. Clock - a gadget on your desktop.

The program has autorun, there is a pop-up menu with settings. Memorization of position and settings. I think, day is count to Am to Am. And night is count to 12 pm to pm The sidereal day is a way to try and make mathematically possible how noon wouldn't be midnight 6 months from today. It is not based on observation, just time it yourself. They just needed to make up 12 hours in half a year and, based on the math, 4 minutes is what one would need.

Just compare the sidereal day against your local sunrise calendar and see if you can find those 3 minutes and 56 seconds we are supposed to be losing everyday. Also, the vast differences in the length of a day sunrise to sunset based on ones latitude makes perfect sense within the Ptolemaic system. Ptolemy and Tycho Brahe get the same treatment as Nikola Tesla, while servants of the establishment like Kepler, Copernicus, Newton, et al are hoisted up as idols of science.

Wait a minute! What you're all saying here is time and space might be the same thing!? Someone should come up with some kind of theory to explain this. This website can live streaming , you can join at my site : agen judi online terpercaya Prediksi Bola Thank you agenpialaeropa. Can we just keep it simple. By adding 4 minutes a day, the sun will always be overhead at noon, everywhere on earth, throughout the year. Actually you all are right and wrong because everything exist in your mind.

You are seeing only what you tell your brain to see and that includes color, movement and time. Have a nice day. Does anyone agree? Well' I didn't need this article published twice, maybe there's publishing display fault's technical issue's being for this reason.

This article is so good it gets published twice, ha! Does anyone know if we have gained or lost any time at all since the introduction use of the current leap year calendar system? Ayo Gabung sekarang dan langsung Claim Bonus Nya Hanya setiap Hari Jumat ya Are these averages the mean, mode or median? None of the discussions center on the answer for each of the Every day is different.

We are victims of old school thought, because we refer to "sunrise" and "sunset" because we USED TO believe the sun rotated around the earth. No, if I am correct, the earth spins making the "appearance" of the sun rising and setting. Use your head for something other than a hat rack. Yes same was my question hence I came here to check answers , earth is revolving exactly 23hrs 56 mins 4 sec but we consider 24 hrs then the error everyday should add up and we should see sun overhead at midnight after almost 6 months as we only have leap year setting to adjust 0.

So I checked on net then they said it's exact 24 hrs based on solar day but 23 hrs 56 min 4 sec based on side real day that is sidereal day is the day related to the rotation of Earth with respect to fareaway stars not the sun so 24 hrs is exact but now speed of Earth is reducing at that time we should have leap mins or seconds or other invention seriously.. Saturday, August 25, Q: If one day is not exactly 24 hours and is in fact 23 hours, 56 minutes, shouldn't the error add up, and shouldn't we see 12 a.

You're right that a "sidereal" day is about 23 hours, 56 minutes, 4 seconds. But this is not a day in the everyday sense. A sidereal day is how long it takes the earth on average to make one rotation relative to the faraway stars and other galaxies in the sky. If you find a star that is directly above you at midnight one night, the same star will be directly above you again at p. Similarly, if you were sitting on the star Proxima Centauri looking through a powerful telescope at earth, you would see Toledo, Ohio, go by every 23 hours, 56 minutes, and 4 seconds.

However, we don't keep time by the faraway stars -- we measure time by a much closer star, the sun! And we are actually in orbit around the sun, orbiting in the same direction that the earth is spinning on its own axis. From our perspective, the sun goes a little slower in the sky because we are also orbiting around it.

This is called a sidereal day. On Earth, a sidereal day is almost exactly 23 hours and 56 minutes. We know how long an Earth day is, but how about the other planets in our solar system? How long does it take for those planets to spin one full rotation? And what is the best way to show the answer to this question? On Mercury a day lasts 1, hours, and on Venus it lasts 5, hours.

Earth takes 24 hours to complete one spin, and Mars takes 25 hours. The gas giants rotate really fast. Jupiter takes just 10 hours to complete one rotation.

Saturn takes 11 hours, Uranus takes 17 hours, and Neptune takes 16 hours. We can look up and down at the numbers and can compare them more easily. To start, make a number line that starts at 0 and goes to the highest number you need to include. You'll see why in a minute. Label the number line so you remember it represents hours. And write what information the graph will have at the top. Now we can easily see which planet has the longest day, the shortest day, and everything in between.