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How I Proved the Earth is Round (with my Bike and Two Sticks)

How I Proved the Earth is Round (with my Bike and Two Sticks)

Around one in every 10 Americans say
that they believe that the earth is flat or that they at least have their doubts
that it’s round. I’m going to test that. I’m going to test if the earth is flat
or not, and to do that I actually need to go somewhere where it’s super flat. So, that’s why I’m going to Regina, Saskatchewan, in Canada, and I’m going to
measure and calculate the size of the earth using just my bicycle and two
sticks. This is not a joke. I’m here with Casey at the Saskatchewan Science Centre
and we’ve got two identical Sundials set up right now since they’re in the
same place the shadows are the same length. But I’m gonna be leaving one of
them here with you Casey – you ready? okay! He is going to set it up on this
very spot right here, and I’m taking the other sundial, and I’ve strapped it to my
bike and I’m going to bike down that road right there. That road is the
reason that I’ve come all of the way to Saskatchewan, because that road is
perfectly straight for somewhere around 140 kilometers and I’ve come to measure
that distance on my bike. Okay so I just zeroed the odometer. Let’s get started.
Here goes science! Okay. This is highway 33 and since it’s very flat here and
there are no mountains to go around or hills to go over, this is one of the
longest straight roads in the whole world and that’s why I’m her. Let’s
pretend that this orange is the Earth. now this is
earth and these two sticks are gonna be the two sundials we’re working with. So I’m gonna put
them in. Don’t try this at home please! Okay, since the orange is round any time we line up the shadows like this they will
never be the same length. If the shadow on the right is short we can expect the
one on the left to be longer. If they were the same length than the orange
would have to be flat. Now we can also measure the length of the two shadows at
the same time and measure the distance between them and figure out the
circumference. Since the Sun is really far away we can treat its light as
coming in parallel lines and therefore we can figure out what angle it’s
hitting both of the sticks at. And that allows us to figure out what angle the
two sticks would meet up at in the center of the orange without having to
pull the orange apart. Let’s say that this angle here is 45 degrees.
That’s 1/8 of a circle, so the distance between the two sticks – this distance
here – that is 1/8 of the circumference around
the orange. So we measure that distance we multiply it by 8 and we know how big
the orange – or the earth – is. That’s what I’m doing except instead of these two
sticks we’re using sundials and instead of measuring this with a ruler I’m
measuring it with my bike right now in Saskatchewan. I’ve got the wind in my back
and it is a beautiful day. I’m clocking at 28.8 kilometers an hour. This is just
great! Things are awesome! To celebrate the 100 kilometer mark I’m going to eat
the earth. It’s pretty good. It shouldn’t surprise
you that I’m not the first person to do this experiment. a Greek scientist named
Eratosthenes did it 2200 years ago except instead of it being in Regina and
Stanton he used the city’s Alexandria and Syene,
and those cities were 800 kilometers apart. He didn’t have bicycles back then
so he had someone pace the distance between the two cities
which is crazy – I mean they were 800 kilometers apart! And his measurements and
his calculations were so precise that it was still within 1% to 16% of the
actual circumference of the earth. That’s incredible. But we don’t know exactly
what his answer was because he used a unit called ‘stadia’
which was how big a stadium was, and there were different sizes of stadiums
and we don’t know what one he meant, so his answer has been lost to the sands of
time. But, I’m gonna try to redo it with a huge upgrade in technology we’re using a
bike. I biked a hundred and thirty-eight kilometers today from Regina to reach
the first stop sign it’s the end of the road and it is Stoughton. Ok so I just
set up one sundial in Stoughton and Casey set up the other one in Regina we
made sure that they were both level and checked that they were both aligned with
one another and everything seems to be good okay. I think my math was a tiny
tiny bit off because I thought that the measurement was going to take place at
10:59 and it is 11:04 and we’re still a few minutes away so I think it will be
more like 11:15 but you know with this experiment what matters is that the Sun
dials are lined up with the road and lined up with each other and I just got
off the phone with Casey and Regina and we are at the exact same point, the exact
same angle right now, with our sundials. At least this angle is the same. (yeah I
know a little nerve-racking right?) We’re really close though! Mine is officially
on the meter stick. Is yours almost there? Okay
so in, well in another like maybe.. we’ll say ten seconds you can grab your chalk.
your line looks pretty good right?! So this is it okay okay we’ll take the
measurements in three two one now I’ve got okay I just measured my shadow and
mine was 66.1cm, and then I called Casey
and his with 70.0cm which means that our shadows
are 3.9cm different! Mine is 3.9cm smaller than his is in Regina, which means that the earth is a
sphere! And it means that I can calculate the size of the Earth. Now I expect that
it won’t be exactly accurate but it’s going to be pretty darn close. Oh that’s
really really rad! Okay, cool… I’m gonna hang up, and get packed, and get on the
road. We now have all of the measurements that we need in order to do the
calculations for the circumference of the earth. So I left Regina on my bike
and I cycled all the way to Stoughton. that distance was 138km when I got to Stoughton. I set up a sundial that was 100
centimeters high and I measured the shadow of the sundial at a specific time.
The shadow was 66.1cm long and so we can do some
simple math to figure out the angle at which the Sun was hitting the top of the
sundial and that turns out to be 56.5°. Now at the exact same time I was taking that measurement, Casey in Regina was taking another measurement
on an identical sundial. his measurement was 3.9cm longer – he measured a shadow of 70.0 cm and that
means that the earth is a sphere and we can calculate its circumference. We use
the same math to figure out the angle that the Sun hit the top of his sundial.
That was 55.0°. Since we know the angle that the Sun hit
both of those sundials, and since the Sun is really far away, we can calculate
the angle that those two sundials would meet up at if they met in the centre of
the earth. We take the angle from Regina and subtract it from the angle in
Stoughton and we get 1.5°. That means that the angle that
those meet up at in the center of the Earth is 1.5°, or 1/240th, of the circumference of the earth. And now.. Now that we know that the
distance we measured is1/240th of the way around the whole
earth, if we take the distance that I measured (the distance that I biked) and
multiply it by 240 we can figure out how big the circumference of the entire
world is. When we do that we end up with 33,120km. By my calculations that is the size of the earth, and it’s
pretty darn close. The true size of the earth is 40,075km which means that my measurements and calculations are only
17% off. Eratosthenes’ measurements and calculations were, maybe,
16% off. I’m really happy with how that turned out.
When Eratosthenes did this experiment over two thousand years ago he not only
proved that the world is round but he measured it and proved that it is a
knowable thing. The earth is something we can experiment
on and learn about. I’m really happy with how well my
experiment turned out because I have confirmed that the earth is indeed round
and I measured it to be 33,120 kilometers around. And that’s not exactly
right, but I mean my measurement is closer to
the earth than it is to Mars and I’m pretty happy with that. The reason my
measurement isn’t a hundred percent accurate is because I didn’t manage to
line things up perfectly, so we took the measurement about 12 minutes too late,
which is enough to make an error of 17% But still, I’m really, really
happy with how well it turned out. I try to do experiments that are almost
impossible – that are just at the border of being impossible [for me], and so if they
always worked out perfectly 100 percent of the time I think I wouldn’t be trying
things that are hard enough. Sometimes I get asked ‘how do I make enough money
from these videos to fund big science projects like this’ and my answer to that
is that I don’t. I don’t even make enough money from this channel to pay for my
expenses let alone my time, but if you want – so that means someone just
subscribed to my channel – if you want to support what I do here on this channel
please check out my patreon page every little bit helps and actually every
patron adds a drop in the bucket. Another way you can support me is to subscribe
to my channel and like this video. It’s not just meaningless Internet points it
actually effects the algorithm which changes how many people will see my
science content. So, that’s huge for me. lastly I absolutely need to thank Casey
and Ryan and everyone at the Saskatchewan Science Centre for making
this whole project possible. It just wouldn’t have been possible to measure
the earth without them, so, please if you’re in Regina: check out this place! It
is amazing. And, check out their website I’ll leave a link in the description
below. Thank you so much for watching!

100 comments on “How I Proved the Earth is Round (with my Bike and Two Sticks)

  1. BEFORE YOU COMMENT: I tested if the sun was far away or not, if you want to comment on that, do it on this video:

    BE WARNED: This is easily the most toxic comment section on any of my videos. As with all of my videos, there is an auto-flagging-filter for 'bad language', and I am trying to moderate comments to reduce that and general name calling. Be civil. I can and will block your comments on my channel if you aren't making this a safe space for discussion. Thank you!

  2. His assumption was far away sun. What would happen with a close sun? Same thing. So did not disprove a flat earth with a close sun.

  3. And for the extra bonus. Look at suns Rays. Do they appear straight or are they flaired? They flair as if sun is close or far?

  4. Good effort but far from foolproof. The close small sun of say 3000!Mile's with cascading light waves would show same. Why can't we get one person on left of sun and one person to right of sun. May be a start.

  5. Not a flat earther! I actually believe most "flat earthers" are just trolling. I do have a question though. The calculations you used to measure the circumference of the earth.. would elevation have any kind of effect on your answer? I'm genuinely curious.

  6. There is a better experiment cuz this one is flawed if the earth was flat this could still work if the sun was the one moving around us.


    there is a better experiment done at night where you shine a strong laser far away at another point, you'll only see the laser if the point ur shining it at is s little bit higher then the height ur shining ur laser from.

  7. Hey I’m going subscribe your channel brother But you should Do the same experiment on the train tracks that’s the flattest part of earth & earth isn’t flat because there hills and mountains but the train tracks are flat & the ocean is completely flat water don’t bend with out a water fall im just saying rivers & water falls always flow to the sea level any land above the sea level is not flat but I 100% believe that the train tracks are right at the sea level trains always go through tunnels through the mountains because it’s flat I watch videos like this because I try to disprove flat earth when I say flat earth I mean the whole foundation of the earth because like I said earth the land that is above sea level is not flat but train tracks and the ocean is completely flat

  8. This experiment is flawed because it is based on the assumption that the sun is huge and far far away. You could get the same results with a smaller sun hovering over a flat earth.

  9. 17% is a huge margin…The shadow experiment can also be done with two sticks on flat surface with a moving sun..😐😐🤦‍♀️

  10. Of course the Earth is round, but this experiment doesn't prove that. It could be also that the Earth is flat and the Sun is near, and you would see also a difference in angles. What you NEED to do is to measure multiple angles in the middle, since their values should be different for one case or the other. You need to do the math first for both cases, check if errors would made it impossible, and then the experiment.

  11. Have you considered a flat earth with a closer sun?

    This experiment does not prove if the earth is round or flat. It depends a lot of your model

  12. Dear Kurtis, viewers who can follow your calculations are already smart enough to know the earth is a globe. The flat-earthers can't comprehend those calculations, and are impervious to them. They won't even blink. You are wasting your time.

  13. Why dont all you ball earthers stick it up your Regina! Explain why Government documents explain there calculations to be made on a stationary plane. Also, If the sun was closer, say only 3000 mi in distance, wouldnt this change your calculations? I believe so. Oh, I just went to your other vid. Assumptions, yes, this is a problem. You see, flat earthers dont assume we have been lied to, we know we have been lied to. God told me so!!!

  14. The sun was closer to your location in Stockton, more directly overhead. If the earth is flat and the elite is covering this up they do have much to gain, such as power and money. The same people who gave you all the math equations also tell you that the earth is a globe, sounds biased to me. If they were covering this up they would literally have thousands of people working to create math equations and theories to do it and us simple people wouldn't know the difference. Use some common sense.

  15. And how did Eratosthenes keep time to know that the measurements at each point were taken at precisely the same moment?

    You are using digital clocks and mobile phones.

    What did the Greeks use?

  16. When you do this experiment, does it matter if the two locations are east to west versus north to south? Or is that not important?

  17. Proves it on a flat road lol. How exactly can you prove the sun is as far away as you think. did you travel to it and verify that

  18. The earth may be round but never a globe, so You can take Your bike and cheat globalists who have empty brain but not us who have common sense

  19. We all know that the Earth is flat. All you have to do is sneak past the laser-shooting penguin guards, climb over the ice wall and enjoy a long chat with A'Tuin.

  20. Amazing what you can do with 2 sticks and a bike and that proves the earth is a ball.🤣😂🤣😂🤣😂🤣😂🤣😂

  21. How would people 2000 years ago be able to communicate with each other at that distance to say hey mine has no shadow hey mine does.

  22. Great video…. but…surely by moving south towards the northern tropic of Cancer you are moving towards the sun's zenith. By headding south the angle will nauturally be less the furthur south you go.

    This experiment proves nothing I am affraid apart from the fact that by heading south you have put the sun higher in the sky, inherantly the shaddows in the south are always shorter.

  23. Dr Zack already debunk this 2 years ago…. learn about why this is flaw

  24. If You do the same experiment with more points you can never triangulate back the sun due to refraction your math is flaw, You make assumptions base in math alone and only with one miserable experiment, Do the same with 3 or more points, not lined up, and you can never triangulate the sun back. Stop lying and take away this fraud and false assumption, You already been debunk by Dr Zack:

  25. Nice demonstration and nice bicycle. Back in 1987, physicist Philip Morrison performed a similar demonstration using a star instead of the sun and using a Ryder truck instead of a bicycle. Different road, too, but pretty much due N and S the road is. Its well worth watching and a lot of fun, just like your video. All Morrison's videos in the "Ring of Truth" series are on youtube and they are all worth watching.

  26. Flat earthers don't dispute the Earth being round it's not a globe it's not a ball it is round. Round does not mean ball

  27. I once proved the Earth was round by showing video and pictures of it taken from space.
    Of course the Idiote flat earther refused To make good on The $100 bet because he claimed the video and pictures were fake.
    Stupid and no integrity!

  28. And you BELIEVE that the earth is a globe. Big faith you have. I’m out. The old joke of Erastotene.. big big joke. The sun revolves around the stationary earth.. Sheeple

  29. Is incorrect to say that Eratosthenes proved the Earth is a globe, he simply measured its circumference assuming that the Earth is round. To prove it is a globe you should measure the length of the stick shadow at many different positions, then you can compare the shadow's length behaviuor with the behaviour expected assuming the Earth flat and the Sun small and and near, and assuming a globe Earth with a Sun very far away.

    Using only two mesures you can't distinguish between the flat and the globe model.

  30. Assuming the sun is far away and going around the earth..
    What happens if you say the sun is local and goes around us not the earth?
    Would we not see what you have shown and the earth is flat?

  31. What I'll never understand is why people desperately try to prove the Earth is flat. Even if it was, so what? What does that do for anyone? Just to have a moment of fame? Just to go "Ha, told you so. I'm correct."
    I just don't see the big deal. I don't see how knowing would benefit us in anyway other than just having a moment to gloat.

    Something else I've noticed is a lot of flat earthers rely on religious beliefs to back up their arguements. We're forever in a debate over whether God is real yet so using religion isn't a credible source for this arguement.

  32. Any insight to the following NASA – CIA – US ARMY Declassified Docs.

    They all clearly include instructions to the reader / user things like this: – Flat non rotating Earth… in context follows.

    "Within the program, the nonlinear equations of motion include 12 states representing a rigid aircraft flying in a stationary atmosphere over a flat nonrotating earth."

    This statement can be found at the bottom of page 12 "NASA Technical Paper 2768 1987 – User's Manual for LINEAR, a FORTRAN Program to Derive Linear Aircraft Models"

    Found here: –

    Here are a few more URS's where the scientists are using the Flat Non Rotating Earth (and atmosphere in some) in their science and calculations.
    I will leave you to search for the term "Flat" or "Earth" there are loads more declassified Docs like these.

  33. This whole 'experiment' relies on the assumption the sun is far away. It is not. It would work the same on a globe or flat earth. Temperature and available light fluctuations from suns energy change dramatically as a fixed point on rotating globe moves only couple of thousand miles closer or farther to the sun. If someone stands at the equator during solar noon, by sundown that someone would have travelled a quarter of earth rotation. That distance compared to 93,000,000 miles is nothing! You really think just by moving a tiny bit nearer, or farther away from the sun we experience a massive change in temp? Oh, and how does suns heat travel through a vacuum? Over to you, dim dim globetards.

  34. God said the earth is flat from the book of Enoch, therefore this guy is a fraud and I believe God because he created the earth flat and and says so in the bible.

  35. I don't believe this proves anything. For one the sun is much closer and it is also in motion. So of course the shadows will be different.

  36. Simple experiment, high school geometry and still the flat earthers will claim this is false, or that this was somehow a NASA conspiracy. Some people are just beyond reason.

  37. Not sure what the shape of the earth is, but I know something is wrong, as I can cleary see things much further than is possible on a globe, 25,000 miles in circumference. 🤔

  38. Your test as an evidence sucks tbh. As bad as Eratosthenes lol
    If the sun in the FE model is currently hovering (high noon) new mexico when you are in Stoughton between the sun and Regina, then obviously you would always get a shorter shadow! and hey! let me break it to you! If you move even further south, your shadow will eventually disappear when you get to new mexico. Your test, like Eratosthenes fails to prove anything. It does look like a nice bike ride tho.

  39. So at 1:12 , he says the road is perfectly straight for 140km, which is roughly 87 miles.

    With a curvature drop of 8 inches per mile , how exactly is 140km flat?

    This guy debunks himself

  40. I also love how you attempt to disprove the flat earth by using your globe lies.

    What you fail to understand is with flat earth , you need to rethink so much of what you think you know.

  41. The irony is…If you were to pass earth at the speed of light, you would see all of it in one viewing, rendering it flat to the observer. Maybe the flat earthers have boxed 'faster than light' travel and are trying to educate us. Haha

  42. Wow almost 4 thousand complete idiots disliked this video. That’s a lot of people that didn’t pay attention in school

  43. so you think calculations are proof? wrong! This is not an experiment it is a contrived demonstration, sorry for your wasted time

  44. oh and you didn't MEASURE the Earth you CALCULATED it based on assumptions, which I am afraid to tell you is NOT science

  45. Got Netflix? Have a look at,
    Derren Brown,
    A film called "The Push". 60 minutes long.
    Very informative for all human beings of what ever belief or understanding..

    Amazing… Thanks Derren Brown.. Its on TV so it must be true?

  46. You can't prove a negative. The rotating globe doesn't exist.
    If we can only see 3 miles with our naked eye and we know for a fact that the ground is flat a d straight for 100kms , why do we see a horizon? I thought te horizon was the curvature huh globers? Gotcha!
    No curvature no globe. Simple. ;D

  47. If the radius is just under 4000 miles then the curvature should be 8 inches per mile squared. Yet you can see Chicago from Michigan. Almost 60 miles away. Observation point is 6ft above lake level. Chicago should be 2000 FT below the supposed curvature. "It's a mirage" pfft ! Lol

    Lake ponchartrain causeway bridge is 24 miles long and built level over water the entire 24 miles. Built only 2 inches longer than the total span of the bridge in order to compensate for the supposed curvature. Only 2 inches in 24 miles? Should be 384 FT of curvature in that bridge. It's flat and level with the lake the e tire 24 miles!

    The longest bridge In the world is 102 miles long. There should be almost 7000 ft of curvature in that bridge. There most certainly is not.

    No curvature no globe. The globe is DEAD!

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