How was the moon born?(Origin of the Moon)

How was the moon born?(Origin of the Moon)

The moon is called the earth's satellite.
You can find it somewhere in the sky with your head almost every day.
That's why the Moon is familiar to us.

But the Moon is very mysterious.

(english sub)

The diameter of the Moon is one quarter of the Earth
This is a really big size
It is the fifth of the solar system satellites
Of course, the Earth is very small, but let's think relatively.

But it is strange.
Why is the moon a satellite of the earth?
How was the moon born?

About 4.6 billion years ago there were many interstellar matter around the sun
These were united and dispersed and repeated.
Sometimes they formed lumps and sometimes sculptures.
And new chunks were born.

The birth of the moon is similar to this.

The first appearance of the moon is presumed to be a planet called Theia
Theia was about the size of Mars
This guy has been getting closer to Earth as he wanders the universe.

And eventually it hit the earth.

Much of Theia and Earth were destroyed.
The debris wandered the universe.
But we must remember that there is gravity on Earth.

Earth's gravity causes debris to spin around the Earth
Now, let's recall the situation.
The fragments of the sun centered together and became a new mass.
The fragments around the earth were the same.

They have continued to unite for a long time on the earth.
And finally it was the moon.

Maybe the moon will be called the son of the earth.

One mysterious thing is that it is a coincidence or a gods play, but it looks the same as the sun when you see the moon on Earth

The sun is 400 times bigger than the moon.

But the sun is 400 times far away and looks the same size

Total solar eclipse, which means that the moon completely covers the sun
This is only observable on Earth
Because of the size and distance of the sun and moon

There are over 160 satellites in the solar system.
But there is no special relationship like Earth and Moon.

Now that science is developing, we know that the sun is a greater one.
In the past, however, the sun and the moon were considered equal.
Is this because of these reasons?

"은잡지" is short for subtle miscellaneous knowledge in Korean.
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What is abba penalty shoot out?

What is abba penalty shoot out?

After a few days, the 2018 Russia World Cup begins.
Football(Soccer) has a draw different from other sports
But this only happens in league matches.

If the tournament draws in the game, it will go into extra time.
If there is no game in extra time, proceed to penalty shoot out

If there is no game in extra time, proceed to penalty shoot out
Usually one team, one team, alternately.
Team A is kicked out once, Team B is kicked, Team A is kicked again

However, the IFBA concluded that this was not fair
So they're trying to change the penalty shoot out method.

So far, statistics show that the first team has a winning percentage of 60%
And the psychological pressure of the team that kicked later is very large

So they are trying to change the penalty method to ABBA.

It is the same for team A to kick first and team B to kick
In ABBA, team B kicked and team B kicked once more
That is, the order of kick is ABBA ABBA ABBA

Except the first, you kick twice
Therefore, even if one fails, the psychological pressure the players receive is reduced

This is the same approach as the tiebreaker system of tennis
This is still only used in some competitions
In the 2018 Russia World Cup, use the ABAB system that we used before.

"은잡지" is short for subtle miscellaneous knowledge in Korean.
You can watch animation and English subtitles on my YouTube channel.
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You can see more detailed explanations in my blog than videos.

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Why is there only February 28th?(How the calendar was created)

Why is there only February 28th?(How the calendar was created)

Calendar dates are usually 30 and 31 days
Except for just one month in February

But it is strange..

The beginning of the year is January and the end is December
However, the shortest month is February, not December.
Why did this happen?

The calendar was first used by ancient Romans.
They used only ten months a year.
March of now was January at that time

It is easy to see the Latin used by the Romans

The sept, which means September, is the 7th in Latin.
The Oct, which means October is the 8th in Latin

Later, Roman emperor Numa Pompilius added two months to make 12 months a year

Numa's calendar was created by looking at the movement of the moon.
At that time people thought the earth was circling the moon.
So one year was 355 days.

The Romans thought of the even number as an ominous number.

So Numa assigned January, March, May, and August 31st.
And the rest of the month was 30 days.
But this will be 356 days a year.
(1, 3, 5, 8 = 31 / 2, 4, 6, 7, 9, 10, 11 = 29)
(31*4 + 29*8 = 356)

So Numa subtracted one day from December, the last month
As a result, December was 28th

Julius Caesar revises Numa's calendar in 45 BC
Because the Earth has been found to be turning around the sun, not the moon.
The result was 365.25 days a year

He assigned 31 days in odd months and 30 days in even months.
This makes 366 days a year
(31*6 + 30*6 = 366)

So he takes one day off in December.
But this leaves 0.25 days.
Multiplication of 0.25 by 4 makes it 1
He added one more every four years.

This is a leap month.

He unveiled his new calendar on November 1, when he changed November to January
So May changed to July

Caesar was born in July.
So he changed the name of Quintilis to July

The name of July was originally Quintilis
And then Quintilis was in May.

So November was changed to January and December was changed to February.
Originally, the date of December was short,
but Caesar pushed for two months, shortening February.

Following Julius Caesar, Augustus became emperor
Augustus wanted to be higher than Caesar.
So he changed the name of August to his own name.

August original name was sextilis
(sextilis means sixth. Caesar pushed for two months, and it was August.)

At that time, August was until 30th.
He did not like the Emperor's Moon to have a date less than any other month
So he took one day out of February with a little date.
And he added a day in August.

This way, the calendar we use now is created

"은잡지" is short for subtle miscellaneous knowledge in Korean.
You can watch animation and English subtitles on my YouTube channel.
Subscribe to the YouTube channel to get content faster.
Please subscribe

▼Silver magazine YouTube channel▼
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You can see more detailed explanations in my blog than videos.

If you have a topic or want to contact me, you can use "Ask Anything"
Please let me know if I have a mistake. I will study and revise it again.
Thank you for reading and thank you for watching the video.
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