Why EVERY atomic clock is 37 seconds fast | Part 2 | Watch and Learn #94
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- čas přidán 5. 09. 2024
- In Watch and Learn 93, we learned about International Atomic Time, and how it's only known in the past, never in the present. Today, let's break down our time standard, UTC, and learn why every atomic clock, at the time of filming, is 37 seconds ahead of UTC. It's gonna blow your mind!
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Thanks for watching.
Marc's channel stands out from others, as he doesn't just talk about watches but also educates us on the science and engineering of time measurement.
*My Casio Wave Ceptors have hipped me to many topics covered in this video. My favorite Casio models are the Tough Solar and Wave Ceptor varieties (Multi Band 5 & 6 and even GPS models). Seeing my Casios receive the radiowave signal from the tower in Fort Collins, CO never gets old to me. I love not having to alter the time an hour forward or backwards in the spring and winter in my Casios.*
Yes love my radio watches, but I live in a non-reception area. However there are Apps for the time signal on the Android store...it works great
Love my Oceanus T200 watch as well. I even bought a cheap Sharp atomic wall clock. So convenient!!
@@bigdreams5554 *I’ve gotta get me an atomic wall clock.*
I set all my clocks and watches off my multiband 6 protrec
Thanks Marc! That hurt. I’m going to have to watch this again. And then refresh my memory every year!
I shall come back every leap year. Humans shouldn’t be subjected to this often 😂
Good idea!
Excellent presentation. Time standards are amazing, GPS uses time differences to determine receiver position and altitude and with WAAS (Wide Area Augmentation Service) can be accurate to 3 meters (10 Feet). In my business (aviation) this allows us to fly in bad weather down to 250 feet above the ground while seeing nothing but grey out of the windshield knowing that we are aligned with a runway and our exact distance from the runway. Microseconds do count.
Sure does. Where I worked we also did WAAS antennas.
Time nerd level "A" - loving it! 👍👍👍
Ha!
So. Chicago had it right when they wrote “Does Anybody Really Know What Time It Is”, in 1969.
Who knew Robert Lamm was a horologist?!
They sure were.
Great song!
"Does anybody really care?" Seems that they do.
BTW, my first big concert was Chicago, 1974 at the Spectrum in Philly.
I believe, the band was still called, 'Chicago Transit Authority' in 1969. The name, 'Chicago' came as a result of a lawsuit filled by the actual Chicago Transit Authority.
Segal's Law -- A man with a watch knows what time it is. A man with two watches is never sure.
Thats me!
Even a stopped or broken analog face watch/clock is Right once or even twice in a 24 hour period.
Love your Watch and Learn videos Marc. What a great topic for discussion...👍
Glad you enjoyed it!
Fascinating. I had no idea it was this complex. Boy, what a "time" we live in.
Very complex. More than we know.
Thank you for your time you spent working this out for us.
Glad it was helpful!
Love this kind of video: learning more about time makes our timepieces that much more enjoyable. Thanks!!
Marc, I enjoyed the heck out of this, nerdy in all the best ways. No matter which watch I'm wearing that day, the next time someone asks me what time it is I'll answer "how the hell should I know'!
Yeah, I stumbled into this abyss at work one day. A big test event used radars, and GPS, and optical trackers, etc. Each tracker, of course, had it's own time associated with the position of the objects they were tracking. We were very confused when two very high tech pieces of equipment put the same object in very different locations. It was all because of the time standards being used were not the same! Correct for that, and suddenly we were seeing well correlated data, as we expected. (Obviously, we were the wrong group to be doing this work at that time....but we were able to get pseudo-smart in a hurry). ;)
25-ish years ago, I worked as a SatCom tech for the USAF in Misawa Air Base in Japan. We used cesium beam frequency standards for our SHF comm gear. Basically atomic clocks, but we used them for precise frequencies, not time. We'd get "Leap Second Notifications" from NIST and we'd go WTF and just toss them.
EDIT - Nowadays I run fleets of computers/containers for software companies and the whole concept of "leap seconds" really causes issues with what computers like to think of as time!
Find this all fascinating - vary glad you're keeping on with the "Watch and Learns". When I first really got interested in watches a couple of years back your early Watch and Learn videos were an invaluable resource. Sure they were for a lot of other folks too.
I love your technical briefings Marc, they are superb , thank you so much ! 😊
Glad you like them!
I couldn't wait for the second part, I love so much this series, it's so informative!🤗
Awesome! Thank you!
This was fascinating. I wasn't aware about this. Thank you Marc!
Awesome. Just as good and as interesting as the 1st video ! 😎👌
Even if it doesn't change anything for our basic everyday life, it is quite amazing science.
Looking forward to watch the next one. Keep on the good work Marc.
Good stuff! Helped me to better understand how my radio controlled watches work.
This was one of the most interesting videos from your channel (and the competition is tough!). Thanks for making it Marc!
Great presentation! I was in college when they were launching the GPS satellites. I haven’t really read a lot about the UTC and atomic time setup since my astronomy and meteorology classes way back in the day. There was quite a bit of interest and discussion about time, GPS atomic clocks etc. in nerd circles due to the satellite launches being in the science news media in the 80s . Cell phone networks didn’t even exist yet, ATT was certainly researching and planning for something by then, but yeah that was all to come very soon in a few years.
With all the strife in the world, I like how time doesn’t see politics, religions, borders, status, or anything. It just is. Thanks again Professor Marc. Looking forward to your next class.
Time literally lives up to its name... Timeless.
We need part 3 !😅😊
Okay!
Marc, this is so fascinating! A little of this I knew from my time in the military. For routine everyday duties and activities, we used local time but for anything more serious, we used Zulu Time for coordination purposes. Thanks for all that you do! Well done 🥃
Thank you for this very informative video. Keep it coming.
You bet!
Excellent and informative. Look forward to the next installment.
Glad you enjoyed it!
This is a really interesting series. Thanks for it.
Another great video that watch enthusiasts should understand!
Thanks Mark, your videos are the best!
Brilliantly interesting, thank you so much for taking the “time” to make this vid!
"Time is on my side" -The Rolling Stones.
Another great video.
Hit it out of the park again Marc 👍🏻
I don't suppose leap seconds affect me much. I always have a Garmin smartwatch on my right wrist which syncs to whatever the current accepted time is. Same for my phone and computers. Brilliant video 👍🏻
Another great engineering video. Metrology doesn't get the respect it probably deserves for underpinning our modern society. Thanks, Marc!
Well said!
Excellent clock-nerd stuff! Please do more.
Thank you so much for the wonderful coverage of time. Could you do a video some time on issues measuring time on Mars and comparing earth-time and mars time? You are a saint.
Marc, I find your video series on "time" very informative, and explained well by you. Almost too much information, LOL! But seriously, I enjoyed them very much, and am looking forward to part three of the series!
Thank you again for your time! I love being on time, and have always tried to sync all of the clocks/watches in our home. Your video makes it even more fascinating for me to figure out what time it is exactly! On a deeper level, it also is obvious that it is not so incredibly important that we know exactly what time it is, because timing things precisely is a man-made endeavor. God's design is not so linear.
Cheers Marc. We learn something new everyday.
I don't know now if i I have Time to Watch any more of this ?
Yet took time to comment.
Haha
This is a great subject for all of us horology & watch nerds. Thanks for doing it!
Glad you enjoyed it!
Gotta love a “ weighted average “
Where all data points contribute… but some more than others …
I wonder if that’s where George Orwell got his “1984 “ line from ;)
Great series , thank you .
I watched, and I learned! Thank you, professor 👨🏫🧑🎓⌚
You are very welcome
I love technical videos like this where you learn a thing or two.
Great video, time is so confusing even noon, there is analemma which changes the time +- 15 mins throughout the year.
Yeah, I'll cover that in EOT
Nice map. Never realized how big Greenland is.🎉
That's due to the map projection that distorts things the farther away from the equator you go. Though Greenland is still pretty big.
Mercator projection at your service.
Really enjoy this series! Just something very different. Something I would like to see more often :)
Glad to hear!
Excellent video and great explanations. Thanks.
You are welcome!
Good job interesting educator-Marc.
Thank you!
Thanks Marc for taking the “time” to explain this. I hope there’s no quiz later. 😂 Have a great weekend!
You too.
Astronomers use something called sidereal time which is what I think you're also referring to. Some wristwatches track this, and then there's the Equation of Time watches, which I'll leave to you to discuss.
EOT I will cover. Sidereal time doesn't have much use (IMO)
Thank you Marc, I appreciate this information it’s interesting . 👍
My pleasure!
Really interesting! Thanks.
This is awesome, thank you for sharing.
My pleasure!
A little outside the scope of this video, but I would have liked to hear you talk a bit about the relativistic effects on the satellites.
Thank you Mr. Marc
You are welcome
The rotation of the earth can be affected by things like big earthquakes. When measured close enough, it becomes quite random and organic - not binary or precise like we desire. Similarly, magnetic north moves.
Thanks for that.
Most interesting!
Ah… Leap seconds. That explains why Seiko quartz watches don’t hit their marks! I think we all owe Seiko an apology.🤔
Citizen do hit the marks miraculously though xD,
Awesome! The point of the earth constantly slowing down should really drive home the fact that no matter how accurate time keeping is, it will never be on "time" with earth.
That is perfectly correct.
Love the video! :)
I have a solar G-Shock that receives a signal from the atomic clock every night that sits on my window sill. I check it occasionally for the exact time; my brain can handle that.
Same
Works perfectly
The prime meridian has a lot to do with Greenwich (a suburb in London) as it passes through it. The French wanted it to go through Paris (in fact a round seal on the ground 50M in front of Notre Dame Cathedral) but there was vote and Uk got more votes. This is important as some old maps still show zero longitude going through Paris not Greenwich London.
Just when I was about to buy a cert chrono..........and now I know it really doesn't matter...... saved a lot of coin.
;)
Awesome vid. Love this shit!
Wow! I thought I knew the correct time!
Even without daylight savings time, the exact position of the noonday sun should be changing depending on seasons (i.e. the axial tilt.) I suppose what I'm asking is shouldn't latitude matter as much as longitude where it concerns global noon? And would they still bother physically measuring the sun from the exact intersection of the equator and the prime meridian? I can imagine how this could all work out with mathematics, but I'm curious about the particulars of how they take and process these measurements of the sun. I can only imagine the measurement is very particular if they are concerned with accuracy down to nanoseconds.
Thank you Marc!
My pleasure!
Nice educational. When are you dropping the link for the hoodie?
😂
So.....how accurate is Bulova's Accutron?
Will there be a Part 3 on Unix Time?
We'll probably have to wait until at least the 1711400000s for that to happen.
I sure wish they would stop the outdated practice of spring forward fall backward.
Twice a year lots of individuals and groups complain about it but nothing has changed.
I guess time will tell.
Hmmm, so what I'm hearing is maybe I shouldn't worry so much about the accuracy of my mechanical watches...
For sure.
What did he say??
Hey, you read my comment on the previous video 🔥😁
Dunno!
You're right it hurts my head-😮
😂
The slowing in the rotation of the Earth and the consequent reduction in centrifugal force must explain why I'm getting heavier 🤔
That’s a “Hot Minute” over Marc’s left shoulder with the clock ⏰ and Sriracha!
😂 😂
Not only does my head hurt, but I can smell burning rubber and there's smoke coming out of my ears.
So, does this mean that if my watch is off by .1 sec/day that it's actually perfectly calibrated? In other words, when a watch is running at perfect at 0 sec/day; is it actually off? Do the "big brand" (Rolex, Omega, etc) watch companies take these factors into account when calibrating a watch?
Should be a feature.
So… is my iphone more or less accurate than my radio controlled casio - or are they different times?
Same.
My brain hurts.
That is a lot to chew on. I always thought we all had 1 agreed upon time and that was that. Very interesting and definitely not boring at all.
Great, thank you
1:08 better than UTI.
😱
Damn, I could not handle Cooper Union....
So what time is it? 😵💫😵💫😵💫
Dunno!
“ It’s too late baby, now it’s too late” - Carol King
I always wondered what the difference between UTC and GMT was, now I know. Sinn loves their UTC watches, leave it to the Germans to go by the standard.
PS a friendly reminder, a blue aventurine Brookville would be a smash hit.
There isn't a functional difference between UTC and GMT. GMT is UTC+0. It's a political choice to separate the standard from UK time.
;)
Spot on. UTC and GMT are definitely not the same thing. UTC is a time. Standard. GMT is a time zone. But as stated, The terms are used interchangeably without issue. Most of the time.
@@festivitycat Interesting. I always assumed Sinn had a way to hide the GMT hand and that's why they called it UTC but brands like that wanting to separate from the UK makes a lot more sense.
Very insightful. Now I need a Tylenol. 😂
😂
I'm a fan that you talked about these more scientific measurements of time. I guess you know that most watch enthusiasts don't care about true time measurements. They only care about male jewelry.
they wear mechanicals who lose and gain seconds daily.
Don't underestimate the size of the geek crowd lol
Paul Winchell?
Who?
Ah! But mean solar time vs. actual solar time! Analemma and all that. Equation of time. Before leap seconds was a short period of rubber seconds, a really bad idea.
We called it Zulu time in the military. Still do I believe.
So time is relative and flexible? Relatively speaking, of course.
Yes. That is a good way to put it.
so gps sets the beat, but utc says when the song starts.
Good one.
Time is a social construct. It's not real, we just agree it is.
It does have EVERYTHING to do with ENGLAND. UTC and GMT are exactly the same. They just want to get rid of the English reference. Nuff said
Sweeping the British under the rug?
Again great. Give us more. please. Next daylight saving time.
Good enough for world government work
True!