The Leap Year as Explained by Neil deGrasse Tyson | StarTalk
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- เผยแพร่เมื่อ 26 ก.พ. 2016
- Neil deGrasse Tyson explains the logic behind the leap year, with a brief history in calendars as well.
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The Leap Year as Explained by Neil deGrasse Tyson | StarTalk
• The Leap Year as Expla...
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It's a very simple thing, but he explain it like an amazing story.
It's the story that makes it simple to understand.
I learned something today.
Facts of life
Put it on your résumé
Me too when I first watched this
Same
Tried to understand this by reading a lot of article. Did not understand. But this 3 mins clip made everything crystal clear. Value of a teacher. Something so complicated can be explained so clearly by a person. Makes it so much easier to understand.
Same. 😅
"And you give it to the neediest month"... lol
This was actually pretty interesting. Thanks Neil.
MIND BLOWN
[Didn't know about the Correction by taking out a Leap Day every 100 years]
+Andy Howard me neither!
+Andy Howard Only when not divisible by 400 years ;))
Yeah my brain melted after I heard that part.
+Andy Howard all I heard was "where da fried chicken and white women at" LOL TRUMP 2016 , NOW OR NEVER
+Major Sanders He got your white woman, and your chicken. I guess I understand why you'll be voting for trump.
Excellent explanation. Learnt something new today
I could listen to him all day
Never thought that explanation of leap year could be this interesting.
Thank you for explaining this!
I went around so many video to understand leap year and I couldn't , till Now!! Thank you
even if the general opinion about it is the opposite: In my opinion, whether something is understood depends more on the teacher and not so much on the person learning.
Sometimes, asking the questions will give you the answer you wanted. To which you will regret ever asking that question.
2:57 "It's like, nuooo"
Oh my God he's so smart it hurts
Thank you sir
We have been taught in the school and universities that the Leap Year was invented by the Romans but I have read in Buddhist Text (Vinaya Pitika) that the concept of Leap Year was prevailed in the ancient India, at least before the 7th century BC. Buddhist monks used to calculate leap year during the Rainy Retreat.
that not true. Time itself is a black invention. ( The West steal all the books and dont know what they are doing)
The Africans had calculated that the solar year was actually closer to 3651/4 days. After 1,460 solar years, or four periods of 365 years, 1,461 years had passed.
The main reason why Western societies use the 4 year method; its because their society dont have dynasties. They count time by 'wars'
Ancient india was started by People leaving the Nile Valley; so he will have knowledge of it. = BECAUSE its the same people.
You can see yoga being done on Egyptian walls. the same windows in ancient Ethiopians buildings have the same design in ancient India.
1+1 = 2.
THIS is why there are 2 indias WEST INDIA and EAST INDIA ; India just means brown/black people in far away lands.. a sort of kin to politcal migration
this is why the West Indies = are called that in the Caribbean, "indies" is plural for indian nations.
You were also told Columbus was going to India. this is true. He knew he was going to WEST INDIA. He did not discover America by accident, they planned a heisted to retrive mansa's gold. Every muslim knew the story of Mansa going to the land West of Africa with thousands of ships. and that family dynasty was worth over 400 billion in gold. You are told that fake story to hid the fact that the new Spain Kingdom was conducting a robbery. BIBLE and new lands is a cover for robbery.
Columbus stop in West Africa for guidance; because that kingdom is the caretaker of this side of the world. and East Africa looked after EAST INDIA
both Indias are dominions of Africa.
THEY LIE SO MUCH, ironically the truth is stubborn against time.
Neil sat and not mention Africa because he knows how triggering it is to fragile minds. ALL HISTORY IS BLACK
The more you know I like learning
That was aowsome explanation
Learnt a lot
Mind blowing....
I love this video and it tells me so much
CGP Grey's video on this perfectly explains what is being said and includes helpful visuals!
+PhoneticIHype
I like how he explains the ballerina on a flatbed truck, and expecting her spin rate to have any connection to the truck's cruising speed is extremely unrealistic.
I think a more practical example would be a concrete mixer's rotating barrel. But if it is mechanically driven by the engine, instead of driven by an independent motor, then it does have a connection to the truck's cruising speed.
Wow. Amazing
Awesome!
great explanation. thx
I wonder how much better the world would be if Mr. Tyson published a relevant paper for every tv interview he has.
+rodr Well aren't you just salty af.
@@nacirema2710 some people understand science and know this guy is just a TV personality.
Half his statements are contradictory. Ie. He states UV is in the red spectrum.
LOL. I though he was going to really impress us and start going on about leap seconds.
He just did in a seperate video.
@@wisewhiterabbit where
@@ontop2324 he explained in a short one very recently, i say recent because they're video chatting. but he talks about celebrating a leap second with his family and friends.
You blowin ma mind Neil!
really educated with this video. nice one there
such an amazing video. why would anyone dislike an informational video/?
+eminems99 Trolls, NDT can explain that to you aswell.
because it took him about 3 minutes longer than is necessary to explain this.
@@dalikskorsgaard3706 shut up
Wow!
I don't remember where I had learned this (originally), but it makes me shake my head when, during the daylight saving time (and the end), people talk about "and leap year is pointless, too."
I always want to reply with..."No, there IS a reason for that," but I just leave them alone in the ignorance.
i remember meeting him and he try to explain gravity with 5 dollars, thanks for the lesson and the 5 bucks..lol
Born February 29th 1984. My actual birthday is this Monday the 29th. Couldn't care less LOL.
Anybody else notice the overdub at 3:07 to correct the year to 1582? ;-)
Neil is the best!
+Pitbull Puppy ....yes kneal ties his sun up.....hahahaha
That's cool. I didn't know it.
Welcome aboard the Leap Day Playlist that I'll be sharing tomorrow... and Happy Birthday Fellow Leapling... if that is the case... either way... I thought I'd share...
Anyone know the music in the background?
NASA says there's 23 hours 56mins for every full rotation of the earth , so everyday for four years we stack up those extra 4mins and have an extra day. This is not how the calendar was made but how we get leap year day.
Go back and reread the NASA article on the length of the day. They explain everything. The Earth is moving around the Sun while it rotates. The Earth turns around in that 23 hour plus time period but but thats an apparent rotation because the Earths movement during the day. The time to return to its original starting point is 24 hours.
Tomorrow is my birthday, wohoooooo thank you Neil for the breakdown
Happy Birthday
when I was a child, I figured out that a year is actually 365.2424 days. though I'm not sure what precision it was or how i figured that out. I think I pulled random numbers out of my behind, but based on this video that figure sounds correct
Time is really getting faster isn't it x
Anybody notice at 3:07 they edited the audio? It looks like he said 1584.
Not an INTEGER (shouldn't say "even") number of days in solar year.
Wow
Every computer programmer know this :)
+Robert Riley that insult was so unnecessary and weak.
yup, just used it in my program, came here to remember the reasons. :)
Lol
Lmao so true
I just started and i came for reasoning behind those 3 conditions
Wonderful explanation as always! Although, I'm now pondering on the 400-year rule clause which puts the leap day back in - aren't we over-correcting that also over a much larger period of time? Is it so large that we don't care about it?
yeah your right, it's said after approximately 3000plus years we'll be ahead by a day
@@joesimba
off by 1 day every 3236 years exactly
Gonna see if that's right or not😅
*if* (year is not divisible by 4) *then* (it is a common year)
*else if* (year is not divisible by 100) *then* (it is a leap year)
*else if* (year is not divisible by 400) *then* (it is a common year)
*else* (it is a leap year)
+
Can we do better?
How about:
if (year %4 !=0) then it is a common year
else if (year % 128 == 0) then it is a common year
else (it is a leap year)
That would still make the calendar line up just as well with reality as it does in the Gregorian Calendar, except there would be one less else if statement.
carultch good, programmer. keep up the good work
@@carultch I like what you've done. Can you explain why 128 though?
@@leofunks31 Because the current system accounts for an exception to the rule of the divisible-by-four leap day rule, effectively every 125 years (just positioned at 3 out of 4 turn-of-the-centuries, instead of multiples of 125). But the actual state of affairs is that amount we should compensate for this over-correction it is much closer to once every 128 years.
365.24219879 days in a tropical year
365.25 days in a Julian year
Difference = 0.0078012
Take the reciprocal = 128.185
So how long again will it take for us to NOT put a leap day in a century year divisible by 400 that would have normally got a leap day.
It is off by 1 day every 3236 years exactly
Sooo....how is it that the Mayan calendar is supposed to be more accurate? Does it also have leap days/years?
OR what about the other calendars...?
Programming 101 would be a so much easier if I have seen this video back then.
So are we behind time or before time or is there form of time travel???
I'm a leap year baby. my birthday us tomorrow and im so excited
in 2017 your birthday will be on Feb. 28 or March 1 or next leap year.
feb 28 of 2017 will be my birthday until next leap year
what correction do we do for the sidereal day to the solar day as the sidereal day is 23.56 minutes
Who is watching this on al leap day? Feb 29, 2020 anyone?
Key and Peele
There was no correction of century years in Julian Calendar and we used it in Imperial Russia, so we still celebrate "Old New Year" on January 14 and Christmas on January 7. And these dates will change in 2100
Imagine a document dated 1716. Historian's would say it was 300yrs ago. But the calendars used at the time differs. The authorship date would greatly differ from our calculations because between the two calendars a leap year is not recognized in the one from 1716. If i were to ask you how long ago was the document above written if its dated 1716? you would say 300yrs ago. But that would be wrong.
I will explain that to my kids on the year 2400
"YOU ARE LIKE 'NOOOOOOOOOOO' "
The time at which...
When I heard the first part: "I had guessed it. I'm awesome."... then I heard the rest and was like: "WTF?! I'm such a noob!"
In Egypt there's a myth that a leap year is not a good year. Geez!
***** Well, I guess some people do believe in that, especially the pessimists.
+Mohamed Farouk
😂😂 That's a Good One!!!
+Asim Rai I hope so ;)
+Mohamed Farouk In Russia also
+Mohamed Farouk
Modern Egypt or ancient Egypt?
The thing I never got though is why do the months need to be that messed up. I mean what kind of sense does it make to have
31, 28/29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ?
Why can't it be
30, 31, 30, 31, 30, 31, 30, 31, 30, 31, 30, 30/31 ?
It would still add up to 365/366 !
If we had a gregorian calendar long enough would the leap go on forever?
`How do people not get this
A few minutes of words that can be stated in four lines of code:
--------
*if* (year is not divisible by 4) *then* (it is a common year)
*else if* (year is not divisible by 100) *then* (it is a leap year)
*else if* (year is not divisible by 400) *then* (it is a common year)
*else* (it is a leap year)
--------
If Neil had wanted to blow people's minds, then he would have explained how this *4x100=400* is the exact same ratio in the size & distance of the Sun & Moon. They appear in our sky as the same size because the Sun is 400 times larger than the Moon, and is 400 times further away than the Moon.
The calendar is driven by Sun & Moon with the Earth's rotation & revolution.
So the Sun-Moon-Earth relationship has a similar mathematical pattern in both time and space. Mind *...blown*.
...and another Sun-Moon similarity is with the Sun's rotation and the Moon's orbit. Both take *27 days*.
(Exact definitions are explained in the Wikipedia articles on 'Solar rotation' and 'Lunar month'.)
+stuf4 Tdadamemd
I don't think it has anything to do with the sun and moon relative sizes and distance.
We could've just as easily made every 128 years the exception to the general rule of multiples of 4 being a leap year, and still been just as accurate.
+stuf4 Tdadamemd
The sun doesn't rotate as a rigid body, so it doesn't just have one period of rotation.
The sun takes 24.47 days to rotate at the equator and 35 days at the poles, as measured relative to distant stars. The 27 days thing, is when you measure it relative to an observer on Earth.
Also, the moon's 27.3 day period is measured relative to the distant stars (sidereal month), while its 29.5 day period (synodic month) is measured relative to our observation on Earth.
Uploaded On 27th Feb
What about the error of 365.2425-365.2375 i.e. the error of 0.005 days/year? how can this error of 0.005 days/year be rectified?
Sourodip Biswas fuck u
Yes , this is corrected if the groundhog sees his shadow on a year divisible by 14 but only if the groundhog did not see his shadow in the previous two years.
A small mistake in this explanation, depending on where you're talking about. "1700 was not a leap year". Well, true, not on continental Europe, but here in England and her possessions (North America being one) we did not adopt the Gregorian calendar until 1752, so 1700 would have operated under the old rules of being a leap year.
Except Scotland and the Colony/US State of Maryland where the Gregorian Calendar were used.
@@jasonpalacios1363 Scotland changed its New Year's Day to January 1 in 1600 but did not adopt the Gregorian calendar until 1752. Maryland would also have adopted the calendar in 1752 as a British colony.
Touche'
It would make more sense if we just said, every year that is a multiple of 128 is not a leap year. And all other multiples of 4 years are leap years. That way we only have one exception to deal with.
Can't find the multiples of 128? Just express the year in binary. It will be a year that ends in 7 zeros when expressed in binary.
Wow... he's so smart.. please Neil, tell us how the earth is an oblate spheroid and pear shape, but pictures show a perfect sphere... please explain
+Natalie Thompson Are you alluding something?
lol go home your drunk
You're right! Somebody is lying...never really thought about it
Why don't we just switch back to the lunar calendar ? Every month gets 28 days. Makes more sense
fail...the earth is flat!
- B.O.B
Captions?
My mother told me many years age on Leap year her daughters can propose to whomever they choose. Its Leap Year. Neil, you've been asked! You're the coolest. I'm too old so you can relax
Play it on half speed. You're welcome.
And yesterday was leap year
Talk about long term planning.
hey Agis here
It's always now.
I'll just act like I understood everything he said.
I learned leap year in school but no one taught us about 100 year rule and 400 year rule
The length of the *_tropical year_* (the type of year controlling the seasons and which our calendar is based on) is 365.24219 days. The goal for inserting or taking out a day is to get the length of the average calendar year as close to the tropical year as possible to avoid getting out of sync with the seasons.
The net effect over time from the three adjustments mentioned by Tyson is to add 0.25 - 0.01 + 0.0025 = 0.2425 days, changing the length of the calendar year from 365 to 365.2425 days.
To get even closer, we would need to take out one day roughly every 3000th year, but that hasn't been implemented yet as far as I know.
Leap year exist
Me: Another day to smoke pot
So, out of curiosity....
Are we ahead, or behind where we SHOULD be??
+Mistah Bryan Everything is even in 2000. Now we are slightly overcompensating again each 4 years, so we are slightly ahead. We will do so until 2100 where we will be about almost 1 day ahead, then we will minus out that one day. Almost, which means we will slightly minus too much. So, after doing it 4 times, in 2400, we would have be lagging by exactly one day. So we'll add that one day back, and everything will be even in 2400.
sounds simple enough
As it was established when?! 3:06
1582
🤯
😮
He said nothing about the "Paladin of the Lost Hour"
that edit tho ;)
As much as I enjoy Neil deGrasse Tyson's comments, as he's a pretty intelligent guy, there are some other good videos that explain the exact same thing, but with diagrams. Maybe someone should now take Tyson's talking in this video, and put diagrams over it. Who am I kidding? He explains it pretty damn well.
Lol I always hated the use of calendars tbh. I’d be cool not keeping track and just living life
So glad other people are in charge of math and not me
Why was that introduced?
How Many Days
365 ÷ 5 = 73
or 366 ÷ 6 = 61
wow so i was born on 2000 2 29 so i was born on the century rule wow im lucky....also i just realised doesnt that make me 4 tomorrow cuz tomorrow is a leap day....dam people born on leap year are young lol
LUCKYYY
+Uzume Tennouboshi Happy birthday (a little late)
same bday😂🙌❤
lol... you should only age one year every 400. Do you have long fangs?
i can only imagine haha btw nice birth date shiro
This guy is more an actor than a scientist.
+Stefan Denchev Then what does that make Richard Dawkins and Bill Nye?
Can't we make a more perfect calendar by increasing the number of hours in a day?
That would mean we would get off with our planetary rotation. We have our days down perfectly, the problem is our days don’t perfectly fit into the revolution around the sun. So changing the time each day, while it might solve the each year problem, would throw off our time every day slightly. Eventually you would get problems like the sun rising in the afternoon or noon and midnight switching.
I'm so jealous of the Leaplings who were born in 2000.
I tried posting this vid and FB would not allow it because it didn’t didn’t meet their community standards. can you tell me why? Neil deGrasse?