The World's First Digital Sundial

In this video I show you how the first digital sundial works. I talk about sundials and how they can change in accuracy and become off by hours over millions of years due to the slowing rotation of the earth.
Digital Sundial creator: www.mojoptix.com/2015/10/25/m...
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*Any experiment you try is at YOUR OWN RISK. The Action Lab assumes no responsibility for any injury if you attempt anything you see in this video or on The Action Lab channel.

[@TheActionLab]

The 6 hour time delta after 2700 years I mentioned in the video wasn't clear. This is the cumulative time due to all fluctuations over that time period. This time is the delta between TT (terrestial time) and UT ("variable" universal time). So if you set an atomic clock 2700 years ago, when the sun is directly overhead today it would read about 7pm. This has to do with why we have to add leap seconds every few years even though the length of day has not increased by that much. The effect is cumulative. So since 1972 we have added a delta of 31 seconds difference between TAI and UTC.

[@perihelion7798]

Thanks for clarifying this point. I was stunned when you said that, but understood the concepts.

[@brandonn6099]

Due to the fact we're constantly adjusting time to match solar time, sundials will, on average over millions of years, be more accurate than any atomic clock. They are what we calibrate time to. (Albeit *those* "sundials" are telescopes... )

[@flaps805]

@@brandonn6099 no they wont

[@saqibmudabbar]

Hi can you put this"digital" sundial in the next action box. Thanks.

[@JesusisJesus]

The Action Lab That was quite interesting dude.

[@Mojoptix]

Wouhou ! Glad you like it ! A lot of caffeine went into designing this sundial...

[@stuball08]

I’ve printed this as well and had just used it for my daughters school project on time. Thanks for your amazing work!

[@TheActionLab]

It is awesome!

[@humanbeing1429]

@Mojoptix amazing work. Great results. Love it. I gotta make one of these for myself. Thanks.

[@Frankie13074]

this is big brain

[@janus2059]

It's so amazing actually....that this fixed, no moving part object can do this.

[@rouge4963]

That’s cool to know about the first sundial.

[@ninaadthepro8611]

Harsh Seven yep

[@Gigantopathetic]

learning about clocks has finally paid off.

[@ajayavsm7476]

Hello there

[@MrTrevortxeartxe]

at least you have the high ground

[@lordseafood]

Years of academy training worth it

[@vegasdevl84]

I do as many of the experiments that you do here as I can with my daughters. They love geeking out. Thanks man!

[@jorgemarcelo4708]

That is really cool, congratulations on being an awesome father. I'm sure your daughters will remember those moments forever

[@vasudevraghav2109]

Congratulations on being a cool father. Try to keep the bulb glowing.

[@TechSupportDave]

That's actually amazing. Showing kids science from a young age increases the chances of them being more curious and passionate later in life. But include some of the simpler math too! It's important for there to be at least 1% theory.

[@Cacowninja]

Can you post it to KZbin?

[@Life_42]

Great to hear you are being the best dad, literally!

[@MikhailChernoskutov]

The real problem, as I see it, is not about switching pixels, it is about switching pixels instantaneously, such that you don't see garbage half of the time

[@IowaHawkeyes59]

This video blew my mind!! The digital sundial was cool, but the information about time was incredible! I love your videos :) I really appreciate all your hard work.

[@markinipannini]

"This clock uses army time" Or as the rest of the world calls it - *time*

[@TheFakePlayerGame]

Mark Ahman [The World]!1!1!11!!!1!

[@lieblingsfarbe4453]

Thought the same, Army time wtf is he talking about ?

[@huawafabe]

It's actually not army time. Army time would be 1640 without the colon. So yeah, it's just standard 24h time

[@huawafabe]

@@Nerdycopia yes and without the colon

[@invisiblefan313]

In the US, 12 hour times are used almost universally, except in the military. The military is commonly refrenced as using a 24 hour time system in pop culture, which is the only time people from the US see 24 hour time, so whenever they see it, they're like "oh hey, that's the time system that the military uses" and not "oh hey, that's time".

[@marioeagle93]

I guess that with a larger sundial, we could also achieve precision in minutes, maybe seconds. How big would that be?

[@abracalebdabra]

You always sound excited to explain stuff to us, thanks for the great video mate!

[@Funkylogic]

That's awesome. The world only gets better when you get an opera house like that to show that analogue and digital mesh so beautifully. Well done sir!

[@TheRealKitWalker]

Ingenious design by that person. Bravo. And to you to dude, another fun experiment. 👍👏👏

[@debashissarkar5638]

The inventor sure deserves huge respect for this amazing invention 😍 😊

[@raymitchell9736]

Very neat and clever design, I've seen these before and know they've been out for a while, but I really like your explanation and demonstration of how it works... A fun fact: the reason why hands on an analog clock are traditionally painted black are because the hands represent the black shadow cast by the gnomon (yeah... I didn't know what the pointy thing on a sundial was called either... Thank you Wikipedia!!!)

[@sirhalib00t]

That's awesome, I diffenetly watched a whole video right after it came out

[@rohitjg]

Understood within reading at the first time

[@praneilmukkamala4538]

What are you trying to say

[@sirhalib00t]

idk

[@TechSupportDave]

are you having a stroke? do I need to call the ambulance?

[@sirhalib00t]

no need kind sir you see, the point of this comment is that i ironically said i watched a whole video (that lasts over 6 minutes) when it got published 12 seconds before i wrote that comment noone would ever understand it because the time has already passed have a nice day :)

[@ecookapp]

So cool! Keep up the good work!

[@picklejimmy8286]

That amazing! Love the videos!!

[@cerwe8861]

Wow, even the idea is really cool! But how it's done is alo really clever. Awesome!

[@jesseshakarji9241]

I remember seeing this cad model 3+ years ago. I'm surprised there aren't more videos of this.

[@EvilOttoJrProductions]

It's good you mentioned that it has to be "made out of the right material" because I was worried about that black filament in the sun, and sure enough it started melting at 4:00

[@manojperumarath8217]

Year 2020: we have flying cars Reality: look, we made digital sundial

[@ehorses2729]

Manoj Perumarath we have flying cars, they are called helicopters, it’s just most people can’t afford their own.

[@SianaGearz]

This project was published 5 years ago.

[@jimmyvines9720]

I absolutely love your channel keep it up

[@Jordan-fy4id]

I remember this used to be a hydrailic press channel. Today this channel is even better than is was before

[@RonaldDas42]

Great video, love the 3D printed Sun Dial

[@alexkowalski8943]

Wonderful idea. Respect!

[@soumalyadatta]

This was brilliant!

[@mcoletta6736]

This is so cool. You are my hero AL

[@khalidelrafie6513]

Amazing complicated simple design

[@scikick]

Would love to watch a follow-up video on the actual design. About how you started, your thought processes, and the compromises you made, everything geeky.

[@ercoledistefano8306]

Seriously impressive engineering.

[@DIProgan]

I would love to see you try adapting and applying more tech to that sundial so that it always show the correct time, say for at least a hundred years or so.

[@johnzach2057]

This is one of the best Action Lab episodes. Can we buy this digital sundial from somewhere?

[@TheFarmacySeedsNetwork]

That's pretty cool man! Nice job! When you get a chance, I need a mini sun I can hold in my hand capable of the same lumens output here and requires no power input. :)

[@plssub]

Humans: **create sundial** Clouds: Imma end this whole *sundial's* career Humans: **create clock** *O U T S T A N D I N G M O V E*

[@Chara_Dreemurr1]

I am ur first sub

[@IvanOoze1990]

Your life has no value.

[@Chara_Dreemurr1]

@@IvanOoze1990 everything is not real it's all just a simulation. Nothing we do matters. We can't get out nothing is real. A rihno villager in animal crossing new horizons: 2020

[@GRBtutorials]

Well, technically a sundial is a clock too.

I remember reading about digital sundial quite a long time ago in (translation of) an issue of Scientific American magazine, if I remember it correctly somewhere in the '90. Later when trying to learn more about it, I have read that there are at least two ways to make digital sundial (which I think both got patented).

[@manaqbhanjanbarpanda272]

Kudos to the inventor👍👏👏

[@55Ramius]

That would be a great thing to put in a experiment box ! : )

[@user-wr2uy9pj4m]

This is really cool

[@cassnick2709]

Wow this was super cool actually. Very interesting!

[@HaroldTheWizardCat]

This is so dope!!

[@HaiTran-ry8pz]

Awsome, i rly love this

[@zmrvll4420]

This is Helpful

[@thetruthexperiment]

It’s self explanatory but amazing. What a cool idea. I want a huge one that is also a giant tower. Call it a clock tower.

[@AV8R_Surge]

Great stuff

[@veixtube]

I printed the model by mojoptix around 3-4 years ago. Took me like 2 days total. I had it outside for almost a year and it warped pretty bad in the end. It was made out of PLA and also black. It got wet in the rain also. Anyone trying this i suggest something that can tolerate sunlight, winds etc.

[@naveenverma70]

Hi i like ur videos and the explanation you provide are clear and easy to understand. Thank you for your contribution in making physics fun. I would request you to make a video on spaghetti puzzle by Richard Feynman and how it was solved. Thanks in advance.

[@shubhendumishra1421]

Great info 👍😊

[@matthewsaulsbury3011]

Wow! That's amazing and cool! 😁👍🏼

[@hoggif]

What a lovely idea! But a pain to get summer time changes working automatically :)

[@CyanicCore]

Smart /and/ useful!

[@kodystclair9774]

I love how it started to melt in the time lapse

[@lzylifeguidesubscribe2124]

This is SO COOL!!!

[@pradyunsharma2903]

That's one of the awesome things I have ever seen

[@spacegooser9147]

That’s awesome!

[@ankitminz5872]

Love it.

[@alexanderunger534]

Awesome !

[@handanyldzhan9232]

Awesome invention. Finally a portable and accurate, precise sundial that's relatively easy to mass produce. In the future, maybe some other variants might be made: - Including one with a solar compass - you couldn't tell the time without the piece taking the latitude into account in its own way anyway, just make it more visible. - A UV-sensitive system to not get tricked by artificial light (provided it's daytime and the sky is clear). UV-A can still pass through glass, so if it can pass through to a black surface with UV paint, it could work.

[@rajanlamichhane3095]

This is one of the coolest clock I've ever watched😍😍 ( I say it clock)

[@hatetoggaf7983]

This channel is great but mad underrated

[@bangaloreshydrohome5863]

Hi Action Lab, i have few questions. Hope u would help me understand.. 1. Since sun is constantly radiating massive energy, the famous Energy equation E=mc^2. Does it mean Sun is losing a small portion of mass? Is sun gradually becoming lighter? 2. Near the viscinity of blackhole, does the gravity impacts speed of light? What's the impact of massive blackhole on speed of light?

[@malinournmalinourn5529]

Very cool.

[@elweewutroone]

“Earth’s orbit is an ellipse” Laughs in gravitational perturbations

[@BadBoiFX]

nerd

[@elweewutroone]

🆗 🅱️🅾️🅾️ *M E R* This channel is FOR nerds. If you do not like nerds, do not come to these science channels. 🆗⁉️

[@nootnoot3401]

big brain meme right here

[@constablebrew]

@@elweewutroone I mean, the person's name is "jQuery" which is a JavaScript library. They are true nerd.

[@PythonPlusPlus]

Elweewut Roone Woosh

[@grimmer2005]

Thats INSANELY cool! :-O

[@nealsonf]

Very cool!!!

[@miniatureface]

Wow this is crazy cool

[@scroopynoopers2892]

wooow, lookah dat gadegckt! iz tolly amazin, you guys.

[@MiguelSantrer]

Manual do Mundo, a brazilian channel abut science made this a long time ago too, this video is great.

[@OverUnity7734]

2:40 Army time. I wonder what the Navy uses for time ?

[@uversusog4495]

Jack Allen Walters, Jr. lol

[@girlsdrinkfeck]

@@uversusog4495 aka standard time

[@GuruPrasad-np1qn]

THATS AWESOME BRO.......

[@firelimbo9441]

Informative

[@Nxrvy]

That is sssooooo coool and I’m thinking who thinked about making that

[@redhawkrobin]

I don't know why or how I ended up here. But that is actually pretty cool!

[@josem138]

By the way, is anyone else also stunned by the fact the chair's shadow at 3:39 up to 4:05 stays perfectly tangential to the tape? Mindblow

[@gvantsasakaruli9900]

I love this thing!!!!

[@Gribbo9999]

It's cool device especially for telling the time backwards here in the southern hemisphere though I guess with a 3D print it would be easy enough to reverse the print file.

[@elliottgussow9555]

The astronomical convention is that the spin of an object is referred to as "rotation," and the path of as object through its orbit is referred to as "revolution."

[@Cacowninja]

So if you cut a bunch of properly placed grooves in something you have a digital sundial? I didn't think that was possible but sure enough it was! That's awesome!

[@jasonduffy]

Printed mine today as a cool clock for camping.....🌲🌴

[@yip9567]

The only channel I know where knowledge exists:

[@rannov.4707]

If you want to watch another educational channel, I suggest you watch, for example, Tom Scott's videos. There are many other good educational channels, but this one is my favourite.

[@yip9567]

@@rannov.4707 alright! Thanks man! Or girl

[@MisterTrayser]

This is the only change that still surprises me I guess!

[@jericon1742]

Wow, this is soo coool.. 😮😮

[@fortyinch]

Now that.... Was cool... 👍

[@intothecalm420]

That is Awesome! Only $23 on Etsy too.

[@MD_ENTERTAINMENT]

Brilliant

[@RandoniumTJ]

Absolute genius 👍 👍 👍....

[@josem138]

4:04 is it "melting"? why is it bending down?

[@craigschooled]

Yeah black wax is horrible sundial material.

[@lieblingsfarbe4453]

@@craigschooled black wax ? pretty sure its Pla

[@SeriousApache]

@@lieblingsfarbe4453 Any black material is bad.

[@nagualdesign]

@@lieblingsfarbe4453 Jesus wept. Of course you're pretty sure it's PLA. We all know it was 3D printed. Jesse knows it was 3D printed. Even if you didn't think it funny, surely with your smarts you must have had an inkling that it was a joke? 😕

[@lieblingsfarbe4453]

@@nagualdesign not really, didn't think he was joking, still not sure doesn't make any sense even as a joke.But I don't know or care tbh

[@stephencresswell4760]

“Army time” 🤣🤣🤣

[@jarocats]

Very, very cool. How large can this be? Or is it limited by the size of the 3D printer that produces it?

[@keddrikyvan]

Solar eclipse: Gonna end this sundial whole career Sundial: I already know, its just temporary

[@savitbharadwaj4023]

This might be the exact reason why ancient people thought eclipses were caused by gods.

[@chittaparija]

It will also not work in Cloudy or rainy weather

[@fuzzosmicroworlds5370]

Or night

[@shajialamusmani3105]

Cloud be like Think again

[@adveshdarvekar7733]

Wow so cool

[@nameless6161]

How do people come up with these things, frickin awesome

[@MhdAliAlashkar]

مبدع

[@thatmcgamer3106]

I remember seeing his video. I thought it as really creative. It’s something that uses a lot of math to see.

[@fuseteam]

now _this_ is true innovation

[@fuseteam]

@Joby Fluorine nah that was just stupid considering they don't offer at least multiple usb c ports if you're gonna remove a legacy port at least offer feature parity lol besides this doesn't require any type of energy to run compared to smartphone not even lasting a day under heavy usage compared to months before the smart "innovation"

[@BryanLeeWilliams]

Pretty cool

[@bungkusi2432]

As a math enthusiast. This is one of the coolest gadgets I ever seen.

[@christianrindlisbacher7185]

Love ❤️ the show ordered a vacuum chamber

[@saurabhsoni4092]

U r absolutely genius....

[@ideaquest]

Great idea. The challenge is to made one that produces the same result with a simplified design.

[@Name_1387]

Oh that is so cool