Name: デンマークが世界と0.23秒差の理由 (Why Denmark Is .23 Seconds Behind The World)
Uploaded: 2021-01-14T10:36:44.000Z
Duration: 6 min 30 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

程度の副詞

on the northeast coast of Bornholm in Denmark.

I had to drive across the Oresund bridge and through Sweden...

GPS: "Take the second exit and stay on 'Dag-hammer-schultz-vag'."

...then take a 90 minute ferry ride, and then drive across the island.

But this island, or more specifically, a north-south line across this island

starting right here, is the only bit of Denmark that is exactly

15 degrees east of Greenwich in London, exactly 1/24th of the way around the Earth.

which means that the sun is highest in the sky here

This lines defines Central European Time for Denmark.

To explain why there's a problem with that,

we need to talk to someone back where I started.

used to be the official timekeeping of Denmark,

so it actually provided what time the national time in Denmark was.

In 1893 a law was put in effect in Denmark,

at which point the time of Denmark was synchronised with international time zones.

So at that point in time, communications, transportation across borders

had become so fast, so international that it was becoming a problem

that every country had its own national timescale.

- Back before railways and modern telecommunications,

every town and village in the world ran on its own time.

12 o'clock was when the sun was highest in the sky, on average, wherever you were.

Once the world started to move fast enough, though,

every town and village having its own time became a problem.

And steadily over decades, governments agreed that the official legal time

would be the same in each region, in each time zone.

And that each time zone would be offset by a round number

compared to the time at Greenwich in London.

The closest round number to Copenhagen was one hour, 15 degrees east,

The clocks everywhere in the country were changed to agree with mean solar noon

and it turned out that wasn't quite good enough

and that means that it's not exactly the same all year round,

and more than that, Earth rotation also slows a bit over time

If we were actually, in Denmark to follow our own time,

we would be off with some hundredths of a second,

and this would actually make it difficult

for Danish financial companies, for instance,

- Once humanity had got the ability to track the Earth's rotation precisely

by a tiny and different fraction of a second each day.

And when computers, and clocks, and scientists around the world

need to be accurate to within that tiny fraction of a second,

So the scientific community agreed to ignore the wobble

and created Coordinated Universal Time, UTC,

which doesn't care about the Earth's movement.

To your phone, your computer and to your bank,

to basically everyone apart from astronomers,

As measured by the average of a network of atomic clocks around the world.

If you want to be really detailed, then on screen is the full formal definition of a day.

And every time the Earth's wobble threatens to drift out of sync

with our standard, we add a leap second to UTC,

either skipping a second or counting a second twice

to get UTC back in line with the annoyingly real Earth and stars.

The catch is, [sighs] Denmark never updated its laws.

- The official law in Denmark is defined by a law from 1893

which states that Denmark follows mean solar time.

In reality Denmark follows the Universal Coordinated Time,

the atomic clock time which is used all around the world.

So I made a petition to Parliament in Denmark

and following that, a member of the Danish Parliament

actually made a question to the minister,

was actually interested in looking into this

but that's just based on when I happen to be filming here.

the error is predicted to be at about .06 seconds.

By the end of the year, it'll be about a quarter of a second.

I've written some code that will keep checking the clocks and automatically

At least until the code breaks and I can't be bothered to fix it anymore.

The error could get all the way to .9 seconds

before a leap second arrives to correct it.

But it's not like phones, and computers and stock exchanges here in Denmark

follow Danish law. They don't pay attention to the stars.

They all just use UTC instead, and ignore the outdated legislation.

decide that we want to keep it this way actively.

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デンマークが世界と0.23秒差の理由 (Why Denmark Is .23 Seconds Behind The World)

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