How long actually is a day

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.

But what do we do about Mercury and Venus? Their days are thousands of hours long. How do we make a graph for those? We make a number line, but instead of numbers 1, 2, 3… we will use 1,, 2,, 3,…. Make a number line that goes all the way up to 6, Along the bottom, write Mercury and Venus.

Above Mercury, mark a dot a little less than halfway between 1, and 2, Now make a dot a little under 6, for Venus. Their dots would be so close to 0 it would be hard to tell the difference between them.

However, this eight-hour movement didn't become standard until nearly a century later, when, in , Ford Motor Company astonished everyone by cutting daily hours down to eight while simultaneously doubling wages. The result? Increased productivity. Thus, while it may be hard for some to believe, the eight-hour workday was initially instituted as way of making the average workday more humane.

Now, the workday is ripe for another disruption. Research suggests that in an eight-hour day, the average worker is only productive for two hours and 53 minutes.

Over this period, 79 days have been longer than today, while have been shorter than today. If every day were as long as today, a leap second would have to be added every Overall, the Earth is a good timekeeper: the length of a day is consistently within a few milliseconds of 86, seconds, which is equivalent to 24 hours. However, over the course of months and years, these small differences can add up and put our clocks out of sync with the Earth's spin.

When this happens, a leap second is used to bring them back into alignment. Leap seconds can be positive or negative. A positive leap second adds a second to our clocks, while a negative leap second subtracts a second. The system of leap seconds was introduced in 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. How fast are we orbiting around the sun? We make one full orbit every year, or roughly We "lose" a sunset because of the complete orbit.

The extra quarter day is why we need a leap year every four years. So there are How long is a "mean solar day"? Let's do the math: One sidereal day is 23 hours, 56 minutes, 4 seconds, or seconds. Multiply this by Divide by That's 24 hours exactly! It's this "mean solar day" 24 hours that is the normal definition of day. If you want to do the math more exactly, a sidereal day is That works out very closely.

Unfortunately, the earth's spin has been slowing down because the moon is sucking away the earth's energy. Every time the high tide of the Atlantic Ocean slams into the east coast of North America, the earth slows its spin a little bit.

The definition of the second is based on the speed the earth was spinning back in , and we have slowed down since then. As a result, we occasionally have to add in a "leap" second to the world's clocks. Grijesh Agrawal August 1, at PM. FX January 23, at PM. Unknown September 6, at AM. Anonymous April 25, at AM. Unknown May 10, at AM. Unknown June 6, at PM. Unknown August 28, at AM. Kevin September 17, at PM.

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