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.
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... )
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.
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.
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
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".
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 :)
@@StayMadNobodycares 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
@@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? 😕
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!!!)
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
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.
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.
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?
3:52 you can see the PLA is melting in the heat of the sun. Wouldnt be the best material for any sun dial that you wanted to work for more than a few days at best.
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.
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."
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.
4:50 Wouldn't the slowdown stop if the Earth and the Moon entered into resonance? It wouldn't necessarily have to be 1:1. It could be 2:3, or something
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.
Got mine up and running in December. Maybe because of the bad angle of the sun, but I can't make out the numbers as they are created on the surface. It hasn't helped that in the last month, we have only had a few hours of clear weather and I can't stand around waiting all day for shadows to be cast.
I was scrolling and I saw the title while the preview played and I was like "why would anyone.." and I saw the time in the shadow change and instantly went to "ooooh that's cool"
4 ปีที่แล้ว
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).
Wouldn’t the duration of each 20 min interval change throughout the year since the speed at which the sun passes overhead changes from winter to summer?
Since this device only changes every 20 minutes, the equation of time (I think that is what you are referring to) doesn't really make that much difference.
I have a question not related to this video. Does energy have weight? If you have answered this already in a different video, I would be very grateful if you could reply me with the link. Very curious to know the answer. Thank you.
@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"
I have a request for you Action Lab: I’ve watched cosmos with Neil deGrasse Tyson and I saw an episode about someone turning sun energy into water. Yes, you read that right: Using energy from the sun to create water. I don’t remember how, but here is my challenge to you: Try to figure out how you can do that and then do it, if you have time.
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!
How big can you get with this and how far can the dial from the display? I’m imagining it has something to do focal length or something. If the holes were a lot bigger and the dial was a lot higher up could I turn my entire backyard into a digital clock?
I had a hell of a time getting mine to print right. Took many tries and many hours each time, and when I finally got it done, I was kinda like "meh, ok" - it's cool but it's kinda hard to make right.
Question. Viewing from my balcony, the sun doesn't set behind the horizon but behind the vertical wall of the next house. Ignoring daylight saving time, does the sun "set" on my balcony at pretty much the same time each day all year round, or does it change?
This is a brilliant question! You're right: in the Southern hemisphere, the idea is to hold the "swiss cheese" part from the other end, and point it toward the South. To make things easier, I designed a second version of the sundial, just for the Southern Hemisphere (the 3D models are all on the Thingiverse page).
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. :)
also, in a lot of schools around the world, a lot of the science lessons are just a waste of time. especially if you aren't planning to become a scientist. here in the uk they make science so fucking boring and repetitive. if they teach like this anywhere else then fuck science man it's not worth the pain and boredom even if you like science. it's most logical if you choose courses that you will enjoy and won't be bored in.
This is super cool, but is it actually digital, though (in the way we use the term today)? Or, if we use the term more literally, aren’t the original sundials also digital in a way?
![[EN] Mojoptix ep. #001: Digital Sundial](http://i.ytimg.com/vi/wrsje5It_UU/mqdefault.jpg)
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.
Thanks for clarifying this point. I was stunned when you said that, but understood the concepts.
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... )
@@brandonn6099 no they wont
Hi can you put this"digital" sundial in the next action box. Thanks.
The Action Lab That was quite interesting dude.
Wouhou !
Glad you like it ! A lot of caffeine went into designing this sundial...
I’ve printed this as well and had just used it for my daughters school project on time. Thanks for your amazing work!
It is awesome!
@Mojoptix amazing work. Great results. Love it. I gotta make one of these for myself. Thanks.
this is big brain
It's so amazing actually....that this fixed, no moving part object can do this.
That’s cool to know about the first sundial.
Harsh Seven yep
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.
I do as many of the experiments that you do here as I can with my daughters. They love geeking out. Thanks man!
That is really cool, congratulations on being an awesome father. I'm sure your daughters will remember those moments forever
Congratulations on being a cool father. Try to keep the bulb glowing.
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.
Can you post it to TH-cam?
Great to hear you are being the best dad, literally!
learning about clocks has finally paid off.
Hello there
at least you have the high ground
Years of academy training worth it
I guess that with a larger sundial, we could also achieve precision in minutes, maybe seconds. How big would that be?
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
The inventor sure deserves huge respect for this amazing invention 😍 😊
"This clock uses army time"
Or as the rest of the world calls it - *time*
Mark Ahman [The World]!1!1!11!!!1!
Thought the same, Army time wtf is he talking about ?
It's actually not army time. Army time would be 1640 without the colon. So yeah, it's just standard 24h time
@@Nerdycopia yes and without the colon
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".
I remember this used to be a hydrailic press channel. Today this channel is even better than is was before
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!
That's awesome, I diffenetly watched a whole video right after it came out
Understood within reading at the first time
What are you trying to say
idk
are you having a stroke? do I need to call the ambulance?
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 :)
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*
I am ur first sub
Your life has no value.
@@StayMadNobodycares 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
Well, technically a sundial is a clock too.
4:04 is it "melting"? why is it bending down?
Yeah black wax is horrible sundial material.
@@craigschooled black wax ? pretty sure its Pla
@@lieblingsfarbe4453 Any black material is bad.
@@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? 😕
@@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
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!!!)
You always sound excited to explain stuff to us, thanks for the great video mate!
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
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
Year 2020: we have flying cars
Reality: look, we made digital sundial
Manoj Perumarath we have flying cars, they are called helicopters, it’s just most people can’t afford their own.
This project was published 5 years ago.
Ingenious design by that person. Bravo. And to you to dude, another fun experiment. 👍👏👏
I remember seeing this cad model 3+ years ago. I'm surprised there aren't more videos of this.
Solar eclipse: Gonna end this sundial whole career
Sundial: I already know, its just temporary
This might be the exact reason why ancient people thought eclipses were caused by gods.
It will also not work in Cloudy or rainy weather
Or night
Cloud be like
Think again
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.
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.
So cool!
Keep up the good work!
Wonderful idea. Respect!
Would it also work past 16:00 because we havnt seen that?
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?
That's why the dinosaurs in Jurassic Park were so angry, sleep schedule all messed up
Wow, even the idea is really cool! But how it's done is alo really clever. Awesome!
3:52 you can see the PLA is melting in the heat of the sun. Wouldnt be the best material for any sun dial that you wanted to work for more than a few days at best.
“Earth’s orbit is an ellipse”
Laughs in gravitational perturbations
nerd
🆗 🅱️🅾️🅾️ *M E R*
This channel is FOR nerds. If you do not like nerds, do not come to these science channels. 🆗⁉️
big brain meme right here
@@elweewutroone I mean, the person's name is "jQuery" which is a JavaScript library. They are true nerd.
Elweewut Roone Woosh
Please mention pixel density in your videos along with the resolution. I like to know the pixel densities in phones.
The only channel I know where knowledge exists:
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.
@@rannov.4707 alright!
Thanks man! Or girl
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."
Amazing complicated simple design
This channel is great but mad underrated
That amazing! Love the videos!!
Kudos to the inventor👍👏👏
Did the PLA start melting? Looked like it did.
“...Should outlast any digital clock if made out of the correct material...”
@@jasoncowin5431 ye just found it funny
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.
4:50 Wouldn't the slowdown stop if the Earth and the Moon entered into resonance? It wouldn't necessarily have to be 1:1. It could be 2:3, or something
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.
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.
This is one of the best Action Lab episodes. Can we buy this digital sundial from somewhere?
This is so cool. You are my hero AL
I don't understand what you mean at end of the video about the clock outliving electronic clocks by using the right material.
Great video, love the 3D printed Sun Dial
I love how it started to melt in the time lapse
Sir I have a question : why there is not exact timings? Why there is a time lapse of 20mins????
Got mine up and running in December. Maybe because of the bad angle of the sun, but I can't make out the numbers as they are created on the surface. It hasn't helped that in the last month, we have only had a few hours of clear weather and I can't stand around waiting all day for shadows to be cast.
I absolutely love your channel keep it up
As a math enthusiast. This is one of the coolest gadgets I ever seen.
I was scrolling and I saw the title while the preview played and I was like "why would anyone.." and I saw the time in the shadow change and instantly went to "ooooh that's cool"
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).
when the earth is fully synced to the moon, how many hours would be in a day? and would 365 days in a year still be a thing?
Wouldn’t the duration of each 20 min interval change throughout the year since the speed at which the sun passes overhead changes from winter to summer?
Since this device only changes every 20 minutes, the equation of time (I think that is what you are referring to) doesn't really make that much difference.
I only see numbers from 11:00am - 19:00(7pm). So does that mean from 20:00(8pm)-10:00am it will not work?
i have a question but might sound stupid ... Can we count the number of pixels which disappear and get more accurate time...
This was brilliant!
I have a question not related to this video.
Does energy have weight?
If you have answered this already in a different video, I would be very grateful if you could reply me with the link.
Very curious to know the answer. Thank you.
Seriously impressive engineering.
now _this_ is true innovation
@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"
Very, very cool. How large can this be? Or is it limited by the size of the 3D printer that produces it?
Im gonna comment here. One day it will be recommended again to us.
Science teacher: talks about sundial ONCE
Action lab: makes video on sundial
Coincidence?
Dont compare a science teachers they suck action lab is way smarter I want him to be my sir
I think NOT!
Gunsz123 you think
I have a request for you Action Lab: I’ve watched cosmos with Neil deGrasse Tyson and I saw an episode about someone turning sun energy into water. Yes, you read that right: Using energy from the sun to create water. I don’t remember how, but here is my challenge to you: Try to figure out how you can do that and then do it, if you have time.
how you supposed to position it? what's the orientation of the clock?
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!
Wow! That's amazing and cool! 😁👍🏼
That would be a great thing to put in a experiment box ! : )
This is one of the coolest clock I've ever watched😍😍 ( I say it clock)
How big can you get with this and how far can the dial from the display? I’m imagining it has something to do focal length or something. If the holes were a lot bigger and the dial was a lot higher up could I turn my entire backyard into a digital clock?
I had a hell of a time getting mine to print right. Took many tries and many hours each time, and when I finally got it done, I was kinda like "meh, ok" - it's cool but it's kinda hard to make right.
Question. Viewing from my balcony, the sun doesn't set behind the horizon but behind the vertical wall of the next house. Ignoring daylight saving time, does the sun "set" on my balcony at pretty much the same time each day all year round, or does it change?
Great idea. The challenge is to made one that produces the same result with a simplified design.
Does gravity change the amount of cycles in caesium?
Won't leaving this outside have the Sundial melt or warp?
Wow this was super cool actually. Very interesting!
I don't know why or how I ended up here. But that is actually pretty cool!
Awesome physics.
Didn't Know one can even make a digital sundial which works only on solar light no battery
its because it doesnt need electricity....
This is so dope!!
Also, how and where can I (or someone) buy a digital sundial?
Thank you.
Manual do Mundo, a brazilian channel abut science made this a long time ago too, this video is great.
Will that sundial work correctly here on the Southern Hemisphere? Would it be backwards/upside down/pastwards?
This is a brilliant question!
You're right: in the Southern hemisphere, the idea is to hold the "swiss cheese" part from the other end, and point it toward the South. To make things easier, I designed a second version of the sundial, just for the Southern Hemisphere (the 3D models are all on the Thingiverse page).
Should've printed it with white filament. Looks like it started to deform from the heat 4:00
This is really cool
How does it adjust for daylight savings?
Would this work straight forward if I am in the desert to know the time? Is the setup (angel and other things) a complicated thing?
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. :)
Can it be used on a wall? I mean that can it be aligned in order to work?
Printed mine today as a cool clock for camping.....🌲🌴
way to turn "this hunk of garbage will never breakdown or decay, it will sit in a landfill longer than humanity will exist" into a positive
*This is more educative that the boring science lesson in school*
also, in a lot of schools around the world, a lot of the science lessons are just a waste of time. especially if you aren't planning to become a scientist.
here in the uk they make science so fucking boring and repetitive. if they teach like this anywhere else then fuck science man it's not worth the pain and boredom even if you like science.
it's most logical if you choose courses that you will enjoy and won't be bored in.
Great info 👍😊
This is super cool, but is it actually digital, though (in the way we use the term today)? Or, if we use the term more literally, aren’t the original sundials also digital in a way?
Could line it with a red or green translucent film to give the time that alarm clock hue.
What a lovely idea! But a pain to get summer time changes working automatically :)
5:40 always wondered how to tell how long 1 second was