Who decides how long a second is? - John Kitching

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Title	:	Who decides how long a second is? - John Kitching
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I remember sometime during my elementary days that I asked my teacher this question My teacher did not get it and just ignored this question, sadly
Comment from : Mark Angelo Dar

And why they have imperial measurement of mass, lenght, and volume but not time 😢
Comment from : My Random Life

Boring
Comment from : Jony

"Who decides how long a second is" brMe: "The person who asked"
Comment from : Barely Editing

My favorite comeback to some moron who doesn’t believe in JesusbrbrWhat year is it?br2023 ADbrbrWhat’s AD?brThe abbreviation AD stands for the Latin phrase Anno Domini, which means “in the year of our Lord” You'll often see AD placed before or after a number to refer to a year after the birth of Jesus ChristbrbrSo the earth straight changed its time when one man entered the scene bc He is that importantbrbrYup When you create something, typically you get credit for it Seems befitting and all, since the earth belongs to Him
Comment from : Krums Korner

Man, I already knew this I wanted to know who decided that 1 second is 1/86400 of a day
Comment from : Loblue Haze

They must teach this in school Great example of problem solving applied science
Comment from : MISSILE 96

Women dobrThey say "just a second" and it's 15 minutes
Comment from : Christos Gerakinis

The Sumerian Turks decided it They brought you the time measurement
Comment from : Atilla Kutlu

Fun fact 1s for 0y 5y 10y 20y 30y brIs different time feeling Age is affect u
Comment from : eri albar

Stone Hedge
Comment from : Michael Anderson

Oh my God Salute to those scientests
Comment from : Shah Faisal

That's exciting to know and imagine how an atom can oscillate 9 billion + times in just 1 sec
Comment from : Micro Tech

The definition of a second has evolved over time Currently, it is defined by the International System of Units (SI) based on the vibrations of cesium atoms The decision to define a second in this way was made by the International Committee for Weights and Measures (CIPM) in 1967
Comment from : Edselantor

"Sir, we crash landed with difficulties but luckily no one died What we should we do now?"brbr"Quickly! Send someone out to mine some Cesium-133, we have to know what year is it!"
Comment from : FuzzyBear

The future generations
Comment from : FuzzyBear

A "NY second" is the time between the light turning green and the guy behind blowing his horn 🙂
Comment from : Raving Cyclist

1 second is 1/86400 of a day, and we all know a day is the time period between one sunrise and the next So that's how they decided how long a second should be There, saved you 6 minutes of time you would have wasted watching this video
Comment from : Memestrous

the nazis
Comment from : terrorist Gooddess 69

So time doesn't exist because we invented it?
Comment from : Daniel Leviathan ll

What is the importance of vaporising the atom? what does it validate?
Comment from : Kenny the Lenny

April 18,1955
Comment from : Richard Decker

Also, can we just take a moment to give humanity a pat on the back as far as time-keeping goes brWe went from cutting edge time-pieces in 1926 that wavered by ±1 second per year (which itself was a marvel at the time) brto bratomic clocks that waver by ±1 second per 100 million years in the 1950s brJust one generation later brIn fact, there's talk about making even more precise ones that use light or lasers or somethingbrStill thoughbr100 million years ago LITERAL DINOSAURS were walking the planetbr±1 second every 100 million years is mind-blowing
Comment from : aharris206

Fun Fact!brSince we have defined the second using atomic clocks in the 1950s, the Earth has slowed down by about 37 seconds It is amazing that we are even able to track this! brbrRoughly every 15 years, the Earth slows down by 1 second, but it ebbs and flows!brbrStarting in 2020, the Earth started suddenly spinning slightly faster for prolonged periods of time fir the first time since we started recording it in the 1950s!brAt one point in 2020, we were about a quarter of a second behind our clocks (for those who know what I am talking about, UT1 was 250㎳ behind UTC)brAND NOW, for the first time since we started recording this in the 1950s, we have actually sped up enough to have gotten back in-synch with our clocks and as of now (late September 2023) we are 001 seconds bahead/b of our clocks
Comment from : aharris206

How did they measure the oscillation of the atom? Thats wild
Comment from : Grayfox Art

I remember,i used to to take the handle forword so i can finish my studies 😂
Comment from : RoEnlightenEd

I decide
Comment from : MWO

ammmmm wait a second
Comment from : mareoh mar

Fun fact: an easier to understand and simple way to measure 1 sec however not as accurate is to use a simple pendulum 1 osscilation of a simple pendulum whose length is (g/2*pi) gives 1 second
Comment from : Sarbagya Bhattarai

The entire video was a build up for the pun in the last line Brilliant work 💯
Comment from : Mounil Shah

Hour, minutes & earths rotation on axis was known to human way before 1500snot with gregorian calendad & british colonism
Comment from : Fine- Ill do it myself

explain like im 5 😭😭
Comment from : Jose Eslabon

A second's duration is directly to the energy that is emitted by sun
Comment from : pelasgeus pelasgeus

Why 24h? Why 60min or sec?brBecause they're the coefficients of 12 which is the most favorite number in historybrIt's so flexible that can be divided by 2-3-4-6brWe got 12 horoscopesbr12 followers of Jesusbr12 Jewish tribesbr12 Imams in Shiabr12 Adityas in Hinduism and 12 arms of Shivabr12 monthsbrIt's so favorite it owns a name: twelve, zwölf, dozen (unlike teen, zehn)brbrBy adding +1 you got the most unfavorite number: 13 A prime number, which is not flexible at all The root of our anxiety
Comment from : Joeshar

one correction electrons aren’t really spinning around axis the term spin quantum number is just a name inspired from planetary spin like computer viruses were named after real world viruses
Comment from : Vishal Tripathy

It's baffling that the US didn't invent an alternative to time, considering our track record in innovating for everything, including speed, measurement, and more
Comment from : Zarif OSMAN

This question has been on my mind for far too long Now i finally have a SECOND to look it up
Comment from : NoyN

Strictly speaking, that’s wrong answerbrWe define one complete rotation of the earth as one day, or 24x3600 secondsbrHow do we know one complete rotation? It is based on astronomical observations pointing to a remote distance star as reference point Due nothing is static in the universe, so we don’t have precise definition of one second, because every day is not exactly the same day So we have to use leap year to adjustbrbrThe cesium-133 atom to perform 9,192,631,770 complete cycles as 1 second Although it is very precise, its accuracy is still based time-keeping clock In other words, the unit 9,192,631,770 cycles per second is calibrated with time-keeping clock brSo one second is NOT defined as 9192641770 cycles of Cesium-133 We can only say that one second is calibrated as 9192641770 cycles brSo time is man-made What Clock measures is not time, is synchronized events Atomic clock measures atom vibration events, electric watch measures quartz frequency, watch measures mechanical vibration events
Comment from : dave z

so annoying his narration is the worst
Comment from : Maxwell Githinji

Comment from : Jitendra Kumar Pradhan

I always thought a second is the result of the time it takes for the earth to make 1 rotation (LOL)
Comment from : Bert Flanders

Goes by definition or goes by measurement rather than reading book copying formula and get degree
Comment from : Eric Pham

it's me yall I'm the one who decides how long a second is
Comment from : kara

Who? The same people who think TED talks are worthwhile
Comment from : Hugh MacDonald

I can tell you one thing i take 1 second as 1000 ms
Comment from : HGD_hanylovely

i decide
Comment from : youre mom lol

It took me 395,283,166,110 Cs133 tik to calculate this and write this comment
Comment from : Akash H

WOooooow
Comment from : Akash H

🤯
Comment from : Elena Zurbo

Same question had in mind
Comment from : Little Learning Lessons

ME I DO
Comment from : Thomas Fisher

this took 347 of ‘em !
Comment from : ricky elvis

How have the atomic clocks been synchronized across the world??
Comment from : The Entertaining Obsidian

Cesium
Comment from : Raymond Gibson

Two and a half eye blinks is a second
Comment from : Vijay Vijay

I am thinking ging of the calenders in next door country
Comment from : amornthep boonsamrannjit

🧢
Comment from : MAX AJ

So this video is how many ticks? 🤔🤭
Comment from : KHANZA SYADZA AL-UZMA

Clocks and atoms have nothing to do with time
Comment from : Eric A Ephemetherson

The second is defined by taking the fixed numerical value of the caesium frequency, ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9192631770 when expressed in the unit Hz, which is equal to s−1 Simple
Comment from : theguywithone

time decides ,IT IS 100 MILISECONDS!!!HAHAHA
Comment from : YAHWEHS servant

Incredible 🫶
Comment from : The Football Challenge

Time
Comment from : DBG

IT brbrbr-Kang the conqueror
Comment from : Dean Jelbert Austria

That number of ticks of cs atoms looks like a phone number 😂
Comment from : Harsha Vardhan

The universe decides The only opinion that matters
Comment from : Patti Potvine

The same people that agreed to this confusing language called English
Comment from : Rudy The Internet God

are you married?
Comment from : pulkit yogi

Chuck Norris
Comment from : hottowers

Does it have any impact on anything
Comment from : Abhishek Singh

Now I can explain to my gf that a second is really matter
Comment from : Hugh Nguyen

The answer is my physics textbook
Comment from : writecombustible

If you go through our Indian text you get everything that you want to learn
Comment from : Somnath Das

The perfect second is the perfect Cesium nucleus
Comment from : Ayodeji Akinmusere

So if a year is one orbital completion around the sun, and they figured out this planet has been around for BILLIONS of years, how did we end up with years “1700” & “2000” 😒?
Comment from : AAAstudioz

WHO DECIDES HOW LONG A MILLIMETRE IS?
Comment from : YOKESH NALLASAMY

IbrI decide thatbrYou are welcome
Comment from : Jeyson Rueda

Can anybody please explain to me here – how do you reconcile Heisenberg uncertainty principle with this accurate definition of a second- in terms of an electron’s oscillations?
Comment from : Yahooo!

But the problem is this “electron-thing” has a dual nature! Means sometimes it is ; and sometimes it is not! Sometimes it is a Particle, and sometimes it’s a wave!
Comment from : Yahooo!

My manorama yearbook year-1995 explained it the same way !
Comment from : Yahooo!

I think the length of a second is decided by a normal beat of a human heart
Comment from : Big Smoke

The "exact second" is the time it takes light to travel "exactly" 299,792,458 metres in a vacuum 2 extra orders of magnitude, than Cesium oscillations Using the Earth's rotation is a vague measurement Now for the measurement of Plank Time
Comment from : Cinema Ipswich

Who knows what makes time go by so fast ?
Comment from : Robert Moir

Very beautiful and powerful song Especially the Alleluia 4:06 Where can I find the music sheets ?
Comment from : Ghuy Kizobo

Who determines how many days in a season
Comment from : Steve Stowell

That means the second was discovered only before 55 years
Comment from : Milan Parmar

Ang laki ng Problem nyohaha
Comment from : Weekly Vlogger

I understood nothing
Comment from : Atul Sharma

This is not the answer of the question in the begining
Comment from : Ertuğrul Irmak

❤❤
Comment from : Arvind

Not the first guy…
Comment from : Chris Russell

If these clocks are so accurate how come they used SEVERAL atomic clocks when they were trying to prove the effect of gravity on time Weighting the results to the more stable atomic clocks 👉😵👈❗
Comment from : alex Marshall