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Why Do We Have Leap Years?
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Күн бұрынSo it's February 29th and we have 366 days this year instead of 365- what's the deal with Leap Years?
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@StopChangingMyNameYoutube1 8 жыл бұрын
Billy: Today I'm 21! I'm old enough to drink...Legally! Mom: Silly Billy, you were born on a leap year, that means your only 5 and a quarter years old according to my calendar Billy: It doesn't work that way ma Mom: Have fun at kindergarten! Billy: Ma!
@McPlaySpot 8 жыл бұрын
Lmfao
@HrothgarXII 8 жыл бұрын
Nice "Pirates of Penzance" reference
@StopChangingMyNameYoutube1 8 жыл бұрын
HrothgarXII Believe it or not I haven't seen Pirates of Penzance or even heard of it before you commented it Is it good?
@HrothgarXII 8 жыл бұрын
KZfaq, All I want to do is watch a video, stop making me update. Very good! One of the best musicals I have ever seen. A central point of the story involves a guy who is 21, but turns out to have been born on Leap Day, and, as a character says "You're only 5, and a little bit over."
@mundotaku_org 8 жыл бұрын
That is mathematically impossible.
@DaxRaider 8 жыл бұрын
when you already know the answer but just watch it cause of hank xD
@Rozwarty 8 жыл бұрын
I knew it was because a year is actually 365.2522 days long, rather than 365, but I didn't know about it's history and the inaccuracy of the Julian calendar.
@CattyEIIa 4 жыл бұрын
@@Rozwarty 365.2422
@litojonny 8 жыл бұрын
but WHYYY IS THERE HAIR AROUND MY ANUSSSDSSSSSSSS??!?!?!
@Tismitch 8 жыл бұрын
+litojonny One day your question will be answered, stick with it bro!
@FieryPheanix 8 жыл бұрын
Someone stole your question
@DanielRenardAnimation 8 жыл бұрын
+Pratyush Srivastava Think it's more like an ongoing SciShow comment-meme, or... something. But hey! April 1st is in one month, so who knows! They might just throw that in there.
@francism726 8 жыл бұрын
So that when you pull it your eyelashes will flutter. Somehow it is all connected....
@djp1234 8 жыл бұрын
@scishow WILL WE EVER GET AN ANSWER TO THIS QUESTION?
@cfltheman 8 жыл бұрын
The Julian calendar was off by 10 days in 1582 when the Gregorian calendar was introduced. The Julian calendar is now off by 13 days.
@michaeljordan1135 8 жыл бұрын
My kid just turned 1 today 4 years ago.
@jespardalverak3099 8 жыл бұрын
im 4 now yeah
@michaeljordan1135 8 жыл бұрын
+brown lucien My son won't be able to drive till he is 64, as old as you!
@ShayPeee 8 жыл бұрын
I'm 6 today! 😊 Always loved my birthday for this reason!
@pat6311 8 жыл бұрын
+ShayPeee I'm 5 today 😁
@araeside6979 8 жыл бұрын
wait wut
@darkmage07070777 8 жыл бұрын
I'm in favor of switching over to Stardates as the new calendar.
@EpicB 8 жыл бұрын
We have leap years so every February 29, we can get out our seats and jump around.
@truboo4268 8 жыл бұрын
+Naveek Darkroom Get out
@EQuivalentTube2 8 жыл бұрын
0:15 Missed a perfect opportunity for Game of Thrones pun
@yaboyeman 8 жыл бұрын
No
@Char12403 8 жыл бұрын
+Equivalent TheIncredible Would have been incredibly unfunny.
@Trubsucculent 8 жыл бұрын
No.
@allenthakur5757 5 жыл бұрын
Yea
@ganaraminukshuk0 8 жыл бұрын
Rules for the Gregorian calendar: - Add an extra day every 4 years - Don't add an extra day if the year is divisible by 100 - Add it back if it's divisible by 400 Imagine being born on 29 Feb 1896 and trying to celebrate your birthday on 29 Feb 1904. That's a whole new kind of leap year baby. (This won't happen again until 2096 and 2104.)
@PanozGTR2 8 жыл бұрын
0:47 I think it is important to note that the 'days' referred to in this entire video are mean solar days (the average time it takes for the sun to reach the same position in the sky), while this definition is actually that of sidereal days, a very slightly shorter amount of time. Long enough, however, that there is (exactly) one more sidereal days in the year than solar days.
@aliensinnoh1 5 ай бұрын
I know that this comment is from 8 whole years ago, but for folks who want to know why this is, it is accounting for the fact that if the Earth wasn’t rotating around its axis at all, there would be one “day” every time it went around the sun.
@blackmesa232323 8 жыл бұрын
That still does not explain one thing.... Why is there hair around my anus?!?!?!
@arceustyrell 8 жыл бұрын
puberty
@feynstein1004 8 жыл бұрын
+blackmesa232323 Wrong guy. I think the guy's name was litojony
@dunkirx8602 8 жыл бұрын
There's a bug that lays its eggs around your anus, the chemicals in the eggs cause hair to grow where the eggs were; you should see a doctor.
@SuperExodian 8 жыл бұрын
+blackmesa232323 to prevent chafing of the buttocks, done, next question please
@deathpony698 8 жыл бұрын
+blackmesa232323 brethren! one of us!
@ClockworkRBLX 8 жыл бұрын
1:10 "The earth orbits the sun every 365.2425 rotations" That number is actually 365.2422 rotations.
@JoshLikeCrazy 8 жыл бұрын
shut up
@ClockworkRBLX 8 жыл бұрын
JoshLikeCrazy k
@lilianamartirosyan2238 8 жыл бұрын
OMG what a difference
@BreezyInterwebs 8 жыл бұрын
+Chromework nice meme
@lilianamartirosyan2238 8 жыл бұрын
+C. Leigh I would would have died
@AlecThePirateKing 8 жыл бұрын
Whenever there's a leap year, I can only think of the paradox song from Pirates of Penzance. "Though counting in the usual way, years twenty-one I've been alive. Yet reckoning by my natal day, yet reckoning by my natal day...I AM A LITTLE BOY OF FIVE!"
@paulmanly1990 8 жыл бұрын
Happy 5th monday in feb. Yay.
@dunkirx8602 8 жыл бұрын
Leap seconds > leap years
@tyorca5854 8 жыл бұрын
Mind = Blown
@angeldude101 8 жыл бұрын
Given that leap years add a day and leap seconds add a second, I would argue that leap years are greater than leap seconds based on the fact that days are bigger than seconds.
@dunkirx8602 8 жыл бұрын
I'm saying that leap seconds are better than leap years.
@Somgosomgo 8 жыл бұрын
+Poop Poop Leap smears though
@chillsahoy2640 8 жыл бұрын
Nice attention to detail, making the Earth's orbit slightly elliptical and slightly off-centre. The whole SciShow and SciShow Space team is fantastic!
@GraveUypo 8 жыл бұрын
ugh FINALLY got to know what happens with that 0,05 day a year. thank you
@RJTheHero8 8 жыл бұрын
Oh, god. This makes leap year birthdays a pain to figure out. 😕
@user-ze8qv6ng7h 5 ай бұрын
Thank you!
@zeromancer-x 8 жыл бұрын
Most comprehensive explanation for a leap year I've ever heard, thanks guys
@domenicfieldhouse5644 8 жыл бұрын
cgp grey did a really good video on leap years
@feynstein1004 8 жыл бұрын
So that our calendars don't get out of sync with the seasons. As simple as that.
@youmaycallmeken 8 жыл бұрын
Different measurements from different perspectives. The Earth, as viewed from a point outside of our solar system, would have a rotation that's about 3 minutes 56 seconds less than 24 hours. The average rotation of 24 hours is the Earth's rotation in relation to the Sun. The difference between the Earth's rotation in relation to space and the Earth's rotation in relation to the Sun is about 3 minutes 56 seconds; that is about 1/365.2425 of a year. Why? Because if the Earth did not rotate on its axis at all (in relation to space), then in one solar year there would be 1 day on Earth, so in every year there is 24 hours that is NOT caused by the Earth's rotation (in relation to space).
@Binyamin.Tsadik 8 жыл бұрын
A year is a full rotation of the earth's axis, not the earth around the sun. Common misconception that Scishow should have caught.
@Binyamin.Tsadik 8 жыл бұрын
David Arias That's the earths rotation about itself not the rotation of the earth's axis.
@Binyamin.Tsadik 8 жыл бұрын
en.wikipedia.org/wiki/Tropical_year
@Ayplus 8 жыл бұрын
I finally figured it out. SciShow is short for SCIENCE Show!
@Xaviur 8 жыл бұрын
Mission for attention:Failed.*FACEPALM*
@Ayplus 8 жыл бұрын
Mercury {Leader Of SD} || MercTFX :(
@kirknorman2403 8 жыл бұрын
Haven't we slightly slowed the rotation of the earth by storing water in reservoirs and keeping it further away from the earths rotational center. That would make the days longer, therefore the years also. Not much longer I know, but it still would add up.
@insu_na 8 жыл бұрын
0:43 Ehh, the tidal link between the earth and the sun is pretty weak, but it is there.
@cloudkitt 8 жыл бұрын
Here's the part I never understand, how did people back then know how and why the calendar was off? I get that after a couple centuries you would notice that your seasons are misaligned, but they apparently knew about the issues in advance and just chose not to deal with them. ...but how did they know about them?
@Walter.Kolczynski 8 жыл бұрын
The Earth actually completes 366.24 rotations every [tropical] year. The length of a solar day is longer than the time it takes to rotate (a sidereal day) because the Earth has to rotate "extra" to account for its movement around the sun. Over a full orbit, that adds up to one extra rotation [approximately].
@Locut0s 8 жыл бұрын
Pretty amazing that they managed to get the "year" this accurate back in 1582!
@Crick1952 8 жыл бұрын
The Babylonians, Olmecs, Chinese ect did all math for this thousands of years before Renaissance Europe. Greek mathematicians calculated how big the earth was 4000 years ago (and no, people didn't think Columbus was going to fall off the Earth. Shakespeare made that up to add drama to his play.)
@Tfin 8 жыл бұрын
To the last bit: We care more about the position and timing of things now though. I doubt that people in that future period, if they still use the same calendar, will let that extra day slip by.
@MattLitzsinger 8 жыл бұрын
You should mention leap seconds! They help correct minor irregularities in orbits.
@boghag 8 жыл бұрын
Small error. at 1:05 Hank says Earth orbits the Sun once every 365.2425 days. It's more like 365.2422 days. That's why the Gregorian calender is still off by one day every 7.700 years. The Gregorian calender would be PERFECT if it was 365.2425 days, because that's exactly what you get from the new leap year rules.
@boghag 8 жыл бұрын
+Paul Visschers Calling it a rotation may be incorrect, but it does not invalidate his reasoning. Contrary to that, if the earth did orbit the sun in 365.2425 days then the whole part of the video about the slight error in the Gregorian calender would not exist.
@WMaster777 8 жыл бұрын
+Leslie Bevis I'll give you an even smaller error. Our relative speed around the sun is not constant, not even our rotation, it depends on numerous factors from the universe. A star exploding on other side of galaxy can cause the tiniest fraction of change. Knowing this all is dynamic, we just keep the Gregorian Calendar as a default, but keep track of all changes and just add a day when needed, keeping it dynamic like the world is.
@WMaster777 8 жыл бұрын
+Paul Visschers I've read the distance between sun and earth already changes about 3% during one cycle. However, I do not have the knowledge to what causes these things exactly, I just know the world is dynamic and therefor we keep track of it.
@boghag 8 жыл бұрын
+W Master The earth is on an elliptical course around the sun. So the distance changes with that. Smaller errors get leap seconds, the Gregorian calender is great and the earth rotates around the sun in 365.256 days (according to wikipedia) - what? I'm confused.
@JacekJurewicz 8 жыл бұрын
A day is not exactly one rotation, there's one more rotation per year than the number of days. Also, the Julian calendar is currently 13 days behind.
@karelcarbonneaumontpellier6766 4 жыл бұрын
Happy leap year everyone
@JackieRoxs 8 жыл бұрын
He already included this in three other videos... Three, two, or one I forgot.
@jm5390 8 жыл бұрын
I'm a fan of ignoring the seasons and basing the calendar on the stars & constellations (those don't change for millions of years). Far better than changes every few thousand years.
@epicvasu6984 4 жыл бұрын
This video is so informative. I’ve learnt a lot of new things today.
@rickastley8884 8 жыл бұрын
Long story short a solar year is 365 1/4 days so we have 365 days in a year but every 4 years we add up the past 4 1/4ths to make up a whole day which is 29th of Feb..
@isabelagusmao6504 8 жыл бұрын
"the universe doesn't care about our calendars" now that's comforting
@DrRChandra 8 жыл бұрын
I wonder how the slight inaccuracy in the Gregorian calendar will intertwine with the fact that with no known regularity, the years are of irregular length (leap seconds).
@Hermboldt 8 жыл бұрын
Hey SciShow! Love you guys ! I'm a big fan and I have to ask if you guys have ever made mind/conscious videos? It would be great to have some elaboration on topics like that. Also, I've always been curious about how/why humans can hear our own thoughts.
@yovanivaldes3104 8 жыл бұрын
So basically what it comes down to is that the day and night cycle, the lunar cycle and the cycle of the sun don't EXACTLY line up perfectly causing misrepresentations in calculating time?
@scopedigitalpro 8 жыл бұрын
Wow! Both Brainy5s And SciShow created a video on the same topic and released it on the same day! Crazy
@johnhb123 8 жыл бұрын
I always wanted to know this. Thanks!
@MrTylerNicole1 5 жыл бұрын
Next year, 2020, is a leap year, too! My cousin was born on February 29th. Imagine having a “real” birthday only every four years.
@lettherebelight1492 6 жыл бұрын
Isaiah 38: 8 and 2 Kings. 20: 1 -11. Tell us about the changing of the Calendar. From 360 to 365 and one quarter days. Bless you.
@darzbluetv526 4 жыл бұрын
Thanks 😍
@karendixon2250 8 жыл бұрын
XD I misread the title as "why we leap years" apparently we play leap frog with the years
@annayosh 8 жыл бұрын
You state 365.2425 as the number of days in the solar year, but actually it is the number of days in a year in the Gregorian calendar. The astronomical number is closer to 365.2422. I have been told that the Mayans actually had a calendar that was more precise than ours on this point, having 365.2420 days in the year.
@KaiserTom 8 жыл бұрын
We should all just use a form of unix time, seconds from the beginning of the universe sounds like a good precise and universal constant that can always be checked and compared no matter where you are, much like we define a meter as the time it takes for light, a universal constant, to travel a certain distance in a certain amount of time.
@daniellbondad6670 8 жыл бұрын
I invented a complex calendar that only I use and will remain accurate for seriously around 3 million years.I set my Ipad to it.
@fakjbf3129 8 жыл бұрын
By the time we ned to start worrying about calendar drift with the Gregorian calendar we'll be needing to overhaul it anyway because the length of the year is slowly increasing.
@fabske_1234 8 жыл бұрын
+Fakjbf I don't think the length of a year will be that much different in about 100,100 years. But I could be wrong
@dominicbruce7558 8 жыл бұрын
Is there some adults who actually don't know this?
@Firmus777 8 жыл бұрын
+Dominic Bruce 1) *are 2) remember how an average is dumb and then remember that half of all people are dumber than that.
@jpetrullo6890 8 жыл бұрын
+NewName *facepalm
@UniqueornBacon 8 жыл бұрын
+Dominic Bruce Are*
@ChenfengBao 8 жыл бұрын
+Dominic Bruce I'm pretty sure most didn't know about the extra day every ~7,700 years.
@KimBoKastekniv47 8 жыл бұрын
+Dominic Bruce Not all countries have proper education, I would've though that some adults can come to that conclusion by themselves, even the condescending ones.
@4thekore 8 жыл бұрын
This season has an extra episode!!
@NJEsperantist 8 жыл бұрын
My bad. I wish I could have seen this a few days early. I was convinced my sister, a Leap Year baby, was only 13 because I thought we skipped 2000. I remembered something about a 400 year rule, but I remembered wrong. At least now I know. Thanks for these educational vids!
@VeNoM0619 8 жыл бұрын
The problem is, we base our time on OUR frame of reference (the sun). And a debate out metric vs imperial, metric is better, but still not perfect, because volume/weight is based on water at a specific pressure (1 earth gravity).
@samsulh314 8 жыл бұрын
So there's a rule, there's an exception to the rule, and there's an exception to the exception to the rule. Great!
@Leafveins 8 жыл бұрын
Anybody else a leap baby? Happy (REAL) birthday to us!!
@brfisher1123 4 жыл бұрын
We're already at another leap year that is 2020 and interestingly the year Hank was born (1980) was also a leap year!
@I_am_Lauren 8 жыл бұрын
happy random extra day everybody!
@connormcelroy1552 8 жыл бұрын
The physics stickyness
@YoungTheFish 8 жыл бұрын
But why do we call it a LEAP day? It sounds like we are skipping a day by leaping over it.
@fabske_1234 8 жыл бұрын
+YoungTheFish Eh, yeah that's a good question. Reminds me of the "Schaltjahr" in german, literally meaning "switch-year" what doesn't make any sense to me either. :D
@jm5390 8 жыл бұрын
Because the date will jump "leap over" a day every 4 years. A date falls on Monday in 2015, falls on Wednesday in 2016.
@fabske_1234 8 жыл бұрын
Jordan Martirossian Well, THAT does make sense. Wikipedia? :D
@MrTylerNicole1 5 жыл бұрын
Jordan Martirossian Yes. Everyone’s on the right track. But if a date is between January and February, the weekday would skip in the following year. For instance, New Year’s was on a Friday in 2016, but Sunday in 2017.
@jadergarcia2827 8 жыл бұрын
How do reflexes work??? You should do a video!!
@sinlessarc7791 8 жыл бұрын
Random Question: If it becomes possible to bend space time around a spacecraft in order for it to travel faster than the speed of light for a long enough period of time, wouldn't it be possible to send a spacecraft to the very edges of the universe and then "see" the creation of the universe?
@FiveAndAHalfCow 8 жыл бұрын
Thanks for the weird birthday Gregor
@karunamoorthyd 5 жыл бұрын
You are very fast in delivery but good info! Thank you for sharing the content!
@Pi3C35 8 жыл бұрын
wow, thanks!
@comfortablegrey 8 жыл бұрын
Space travel could need its own calendar eventually. Thanks for explaining why I need to live with October being the tenth month.
@johntracy72 Жыл бұрын
That's where stardates in Star Trek come into play.
@sydneyhoiseth3300 8 жыл бұрын
Could you do a video on oscillation and simple harmonic motion
@Jus10Ed 8 жыл бұрын
Pontifex Maximus is an awesome title.
@HungrysitesRu 8 жыл бұрын
As a programmer I can definitely say - it's one of the biggest mistakes people ever made. This system is sooooo architecturally incorrect... Pretty much similar to dozens, ounces, feet, miles, pounds, hours, minutes. All these things and decisions were so random and so painful to deal with especially if you're working with computers.
@crusherolies8195 8 жыл бұрын
+Александр Улитин (HungrySitesRu) ahh yes, so you are saying you are a bad programmer. too hard to add the mathematical formula to your programming? aww.
@HungrysitesRu 8 жыл бұрын
+Crusher O'Lies I don't say it's impossible. I just say that all these decisions are random and pretty much INCORRECT. This is a perfect example of BAD DESIGN for such a system.
@crusherolies8195 8 жыл бұрын
Александр Улитин lol they are NOT random, they are based on the math that the earth takes longer than 365 days to get back to the same point in its orbit. you are referring to the banking issue with leap years how shit got turned back to like 1900. but again bad programming is the problem, why not program 4 digit years instead of 19__. well im glad that YOU can say its all random, because im sure you spend so much time calculating the orbit of planets while you program crappy programs that dont work. there is no calendar which is going to wkr nicely EVER because AGAIN earth doesnt orbit the sun on a perfect whole number of days. if you cant handle adding the formula to the end of date processing then perhaps you should quit programming since it is obviously above your skill level.
@branuhlig8476 8 жыл бұрын
Merry leap day!
@MeNotyouxD 8 жыл бұрын
I have a question about consumption. Is it healthier to drink a cola each day for one month, or drink one month's worth of cola for one day? I know that the healthiest is of course to not drink any. But I'm interested, because I usually go for the last option, I'll take a break from candy and sugar, then just eat a lot of it for a few days and then stop completely for 1-3 months.
@DarkAion 8 жыл бұрын
+MeNotyouxD Didn't they do an episode on diets and binging already?
@MeNotyouxD 8 жыл бұрын
Did they? If so can you tell me what it's called, I tried to look around, couldn't seem to find anything.
@johnspartan12 8 жыл бұрын
+MeNotyouxD One of these days you're gonna fuck up your pancreas that way
@Jackboy019 8 жыл бұрын
+MeNotyouxD It's better to drink 1 a day than drink a month's worth in a single day. Your body will be able to easier absorb the cola incrementally than digest it all at once. You will hurt yourself drinking a month's amount in one day.
@crusherolies8195 8 жыл бұрын
+MeNotyouxD when you eat sugar your body puts out insulin. your pancreas which makes the insulin has a limited amount. sort of like cumulative effect, once your pancreas has made that limit amount you are totally fucked and will be diabetic. eating a slice of bread is worse for your pancreas than eating a teaspoon of pure sugar. what you are doing is extremely bad for you.
@llantup 8 жыл бұрын
The short answer: the Earth wobbles, and doesn't spin in coordination with its orbit.
@Zomgltd 8 жыл бұрын
I prefer the gormanian calandar :P Leap year is just double intermission after all :P All joking aside it's actually a decent calendar lol
@jcoronet2000 8 жыл бұрын
Scott Kelly is coming back from 1 year on the ISS tomorrow!!!!
@plastichamster365 8 жыл бұрын
+Emily K. Playing doodle jump
@bish6124 8 жыл бұрын
one extra monday... like the world needs more.
@redactedmcjoe1343 8 жыл бұрын
Talk about the recent discovery of Einstein's gravitational waves!
@strawberrylemonades 8 жыл бұрын
+ETHN They talked about this on SciShow Space :)
@redactedmcjoe1343 8 жыл бұрын
+strawberrylemonades Handn't realized they have a 2nd channel, whoops
@mementomori5580 8 жыл бұрын
The important lesson to take from this: Space doesn't care.
@xapemanx 8 жыл бұрын
would have prefered the 28 day 13month calendar , would be nice to always have newyears on a weekend XD
@tdph68 8 жыл бұрын
Wait…I just realized this is John Green's brother. So that's why they sound the same
@julianhernandez3947 8 жыл бұрын
You're welcome for the Julian calendar, Plebeians!
@HojozVideos 8 жыл бұрын
Wow. I am a leap year child. Yay I guess
@spambot486 8 жыл бұрын
It still doesn't explain why dad hasn't come home yet :(
@vaultdweller123 8 жыл бұрын
my head hurts
@Merennulli Жыл бұрын
Interestingly, we won't need the system changed every 100k years because we've also been using leap seconds...until last month (Nov, 2022) when they decided to stop the practice. The new plan isn't settled yet, but one proposal is to make it a leap minute every time it reaches 60 seconds worth of difference. Something most people would see only once in a lifetime. I'm a little confused why Pope Gregory XIII didn't just cancel the next few leap days to let the calendar drift back instead of shortening February so drastically.
@3of11 8 жыл бұрын
Would be a lot simpler to have 13 months of 28 days = 364 days. Every month would have 4 weeks thus every numbered day would be the same day of the week for every month every year and the 365th day= New Year's Day = January 0th and on leap years have it be 7/0 as election day or something and don't make either of them part of the MTWHFSS weekday. Call them "newday" for 1/0 and "voteday" for 7/0.
@hasmas5951 8 жыл бұрын
in the arabic moon calendar we don't add any extra days or months
@belial024 8 жыл бұрын
I wonder what flat earthers do on this day?
@Citiesinmotionplayer 8 жыл бұрын
+Ruy Duarte Sit in their man-caves and cry into a pringles can.
@Lttlemoi 8 жыл бұрын
+Ruy Duarte Yell angrily at clouds and curse the government?
@KimBoKastekniv47 8 жыл бұрын
+Ruy Duarte Wear a tin-foil suit to protect themselves from reptilian mind control waves.
@NikolajLepka 8 жыл бұрын
I feel like we get a variation of this video every year lately not by the same channel, but by affiliated channels
@seabb 8 жыл бұрын
You mean every leap year?
@NikolajLepka 8 жыл бұрын
Shelly Bai my mind!
@whatshisnamegain1 8 жыл бұрын
I thought that at the time the Gregorian calendar was invited, the Julian calendar was 11 and not 13 days off...
@joshuawells8227 8 жыл бұрын
+What's Their Name Again? That's right, the current difference is 13 days, not 16.
@sporwal98 8 жыл бұрын
read about the Indian calendar. It requires no correction.
@markholm7050 8 жыл бұрын
Wish you had posted this video a few days earlier. I recommend videos to a high school astronomy teacher. Sometimes she finds one useful as class or supplemental material. This one would have been a good candidate, but since it came out Feb 29, she would not be able to use it till Mar 1, a bit behind the curve.
@Tikoty 8 жыл бұрын
Oh, Hank! You dun goofed. There are about 366.25 rotations of the Earth every Solar year. You were off by 1. A solar day is not the same as one rotation; it's a little bit more than that, to account for the Earth having moved a bit in her orbit. That is why astronomers talk about sidereal days and solar days. You confused the two.
@SimonTyler0 8 жыл бұрын
+1
@entropyzero5588 8 жыл бұрын
+Scott Craig True, but irrelevant to the video. It would have overcomplicated things: He first would have had to explain that no, what we typically call a "day" or "24h" is indeed not the same as one rotation of the Earth around its axis before getting to the actual content of the episode. Maybe content for another video? ;)
@TacticusPrime 8 жыл бұрын
+Scott Craig No. A solar year is about 365 days, 5 hours, 48 minutes, and 45 seconds. A sidereal year is about 365 days, 6 hours, 9 minutes, and 9 seconds. So you are completely wrong.
@Tikoty 8 жыл бұрын
Entropy Zero All he had to do was avoid saying "rotation" and stick to "day". Not that hard to do.
@olivierbelair4307 8 жыл бұрын
+TacticusPrime Careful, it's about the numbers of solar days vs sidereal days in a solar year and not solar year vs sidereal year!
@Randicore 8 жыл бұрын
Now the question is what will we do when we have multiple planets with different days to work on.
@Calvero52 8 жыл бұрын
I was just wondering "Hmmm, I wonder if Hank covered the cause for needing a lea....(looks at subscriptions) Oh, I guess he has!" :)
@kryptokroyal5205 8 жыл бұрын
thats a good video lots of information
@1ash1ey63 4 жыл бұрын
*when you notice the video was made in leap year*
@VulcanTrekkie45 8 жыл бұрын
I'm in favour of switching to the Neo-Julian Calendar, as proposed by Matt Parker: skip the leap year every 128 years. That way it drifts only 1 day in 625,000 years.
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