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... )
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.
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.
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 :)
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".
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
@@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? 😕
@@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
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.
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.
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.
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."
@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"
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 года назад
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).
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.
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"
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!
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 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. :)
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.
Ummm, your Digi Sun Dial is kinda warping/melting. Black filament doesn't like hot sunlight. You are best using white or similar that is heavily opaque so that no light shines through the plastic (unless you're making fancy coloured translucent Digi Sun Dials).
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.
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.
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.
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.
I think your comment and your correction to your comment just muddies things up. The ERA measures an angle of rotation between rotation of the Earth to the Celestial Intermediate Origin- CIO has no instantaneous motion along the Celestial Equator. ERA replaces GAST- Greenwich Apparent Sideral Time ( in whose frame the celestial origin moves along the celestial equator). OF note the origin in GAST is called the Equinox and that precesses westwards every year. What created this move to ERA was Radio Astronomy and Very Long Baseline Interferometry and Pulsar observations.They are more stable than Siderial (Star) Time. In addition during a 24 hour period( measured against the position of the Sun at noon, Solar Time) the Earth does not rotate back to the same position as yesterday because it has ALSO moved further along its orbit about the Sun, on average it has to rotate 1 degree to get back to the same position. Today with all the nimble accuracy of computers we throw in precession with nutation ( wobble of the earth ) and these all add to the delta you mention between the old system of GAST and the new system of ERA. But they way you explained this can be confused with the length of a day on the surface of the Earth. It sounds like in 2700 hundred years the day has increased 6 hours, not true. In 2700 years the day has increased by about 37.8 milliseconds. The delta you talk of has to do with the measurement between old system GAST and the new system ERA.
I have a weird question, why does sundial rotates rotates clockwise? We know that earth and other planets rotates in it's axis counterclockwise. And also, all planets rotates counterclockwise around the sun. Hoping for demonstration.
![[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
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 RUclips?
Great to hear you are being the best dad, literally!
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.
learning about clocks has finally paid off.
Hello there
at least you have the high ground
Years of academy training worth it
The inventor sure deserves huge respect for this amazing invention 😍 😊
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 :)
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
I guess that with a larger sundial, we could also achieve precision in minutes, maybe seconds. How big would that be?
You always sound excited to explain stuff to us, thanks for the great video mate!
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!
I remember this used to be a hydrailic press channel. Today this channel is even better than is was before
"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".
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
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
Ingenious design by that person. Bravo. And to you to dude, another fun experiment. 👍👏👏
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
That's why the dinosaurs in Jurassic Park were so angry, sleep schedule all messed up
I remember seeing this cad model 3+ years ago. I'm surprised there aren't more videos of this.
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.
Wonderful idea. Respect!
So cool!
Keep up the good work!
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.
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.
Amazing complicated simple design
This channel is great but mad underrated
Kudos to the inventor👍👏👏
Seriously impressive engineering.
That amazing! Love the videos!!
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.
Wow, even the idea is really cool! But how it's done is alo really clever. Awesome!
I love how it started to melt in the time lapse
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
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.
Printed mine today as a cool clock for camping.....🌲🌴
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."
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"
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.
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).
Great video, love the 3D printed Sun Dial
I absolutely love your channel keep it up
This is so cool. You are my hero AL
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?
I don't know why or how I ended up here. But that is actually pretty cool!
Great idea. The challenge is to made one that produces the same result with a simplified design.
Manual do Mundo, a brazilian channel abut science made this a long time ago too, this video is great.
Would it also work past 16:00 because we havnt seen that?
This is one of the coolest clock I've ever watched😍😍 ( I say it clock)
This was brilliant!
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"
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!
Please mention pixel density in your videos along with the resolution. I like to know the pixel densities in phones.
“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
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
As a math enthusiast. This is one of the coolest gadgets I ever seen.
That is Awesome!
Only $23 on Etsy too.
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?
Wow this was super cool actually. Very interesting!
Absolute genius 👍 👍 👍....
What a lovely idea! But a pain to get summer time changes working automatically :)
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
Wow! That's amazing and cool! 😁👍🏼
That would be a great thing to put in a experiment box ! : )
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 really cool
This is so dope!!
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. :)
That's one of the awesome things I have ever seen
Great info 👍😊
IF this guy, styropyro and wiliam osman made video toghether it would be banger
Im gonna comment here. One day it will be recommended again to us.
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
wooow, lookah dat gadegckt! iz tolly amazin, you guys.
Love ❤️ the show ordered a vacuum chamber
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.
Very cool.
U r absolutely genius....
Ummm, your Digi Sun Dial is kinda warping/melting. Black filament doesn't like hot sunlight. You are best using white or similar that is heavily opaque so that no light shines through the plastic (unless you're making fancy coloured translucent Digi Sun Dials).
This is the only change that still surprises me I guess!
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.
Could line it with a red or green translucent film to give the time that alarm clock hue.
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.
Smart /and/ useful!
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.
*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 stuff
I remember seeing his video. I thought it as really creative. It’s something that uses a lot of math to see.
This is Helpful
How do people come up with these things, frickin awesome
That is sssooooo coool and I’m thinking who thinked about making that
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
That's a really good survival tool
Awsome, i rly love this
I think your comment and your correction to your comment just muddies things up. The ERA measures an angle of rotation between rotation of the Earth to the Celestial Intermediate Origin- CIO has no instantaneous motion along the Celestial Equator. ERA replaces GAST- Greenwich Apparent Sideral Time ( in whose frame the celestial origin moves along the celestial equator). OF note the origin in GAST is called the Equinox and that precesses westwards every year. What created this move to ERA was Radio Astronomy and Very Long Baseline Interferometry and Pulsar observations.They are more stable than Siderial (Star) Time. In addition during a 24 hour period( measured against the position of the Sun at noon, Solar Time) the Earth does not rotate back to the same position as yesterday because it has ALSO moved further along its orbit about the Sun, on average it has to rotate 1 degree to get back to the same position. Today with all the nimble accuracy of computers we throw in precession with nutation ( wobble of the earth ) and these all add to the delta you mention between the old system of GAST and the new system of ERA. But they way you explained this can be confused with the length of a day on the surface of the Earth. It sounds like in 2700 hundred years the day has increased 6 hours, not true. In 2700 years the day has increased by about 37.8 milliseconds. The delta you talk of has to do with the measurement between old system GAST and the new system ERA.
My great grandfather's watch would like a word with you.
I have a weird question, why does sundial rotates rotates clockwise? We know that earth and other planets rotates in it's axis counterclockwise. And also, all planets rotates counterclockwise around the sun. Hoping for demonstration.
I don't understand what you mean at end of the video about the clock outliving electronic clocks by using the right material.