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如何知道地球不是平的?

This Is How We Know Earth Isn't Flat

Hey there!
嗨 大家好!
Welcome to Life Noggin.
欢迎来到《品生活》
Right now you’re probably watching this video from somewhere on Earth…
此刻你可能正在地球的某个地方观看这个视频
that big, round planet you humans call home.
那个人类称之为家的又大又圆的星球
But how do you know the Earth is round?
但你怎么知道地球是圆的呢?
Your senses would tell you that it’s flat.
你的感官告诉你地球是平的
After all, if you stand in a large field,
毕竟要是你站在一大片平地上
it actually looks pretty flat.
它确实看起来很平坦
And if you walk through that field,
要是你在这片平地上走一圈
it doesn’t feel like you’re going over a curve.
你不会觉得你走在一条曲线上
Could it be that the Earth is actually flat?
那么地球真的是平的吗?
Let’s try an experiment.
让我们来做个实验吧
Say you’re standing in a field outside of Chicago.
假设你站在芝加哥郊外的一片田间
If the Earth is flat, you should be able to see southwest
如果地球是平的 那你应该能看到西南方
and see some of the tallest points in the United States, the Rocky Mountains.
还可以看到美国最高的一些地方 也就是落基山脉
But the thing is, you can’t.
但问题是 你不能
That’s because of the curvature of the Earth.
这是地球的曲率造成的
You’ll notice a similar problem if you stand on a seashore and try to watch a boat sail away.
假如你站在海岸上 试着看一艘船驶离 你就会发现相类似的问题
After a while, it will disappear from view.
等过一会儿 这条船就会从视线中消失
And not only that, but the bottom of the boat will vanish before the top
不仅如此 当船穿过天际线的时候
as it goes over what’s called the horizon line
也就是天与地相接的地方
–the place where the sky meets the earth.
船的底部会先于顶部消失
For someone who is six feet tall,
对于一个六英尺高的人来说
the horizon line is only three miles away.
地平线只有三英里远
But the higher up you are,
但是站得越高
the farther you can see over the Earth’s curve.
就能在地面曲线之上看得越远
This is why standing on a tall mountain
这就是为什么站在一座高山上
might allow you to see over 100 miles
你能看到100英里之外
while standing in a field will only let you see a short distance.
而站在平地上你却只能看到近处
It also means that taller people can see slightly farther than shorter people.
这也意味着高个子的人能比矮个子的人看得略远些
Good thing my animator can make me any height!
幸好我的动画设计师能让我达到任意高度!
See, I’m like one ant dude.
看!我就像是一只蚁人!
The thing is, none of this is new information.
问题是 这都不是新的信息
We’ve known about the planet’s curvature for over 2000 years.
早在两千多年前 我们就已经知道了地球的曲率
The Ancient Greeks figured out that the Earth is round based on several pieces of evidence,
古希腊人在几条证据的基础上指出地球是圆的
including their observations of ships going over the horizon line.
包括他们对船只越过地平线的多次观察
The scientist Aristotle, writting in 350BCE
科学家亚里士多德在公元前350年写到
noted that during an eclipse,
他注意到月食期间
the Earth makes a round shadow on the Moon.
地球在月球上投下一个圆形影子
He also realized that stars appear in different places depending on where you are standing.
他也意识到 所站的位置不同 看到星星出现的地方也不同
For example, he saw stars in Egypt that weren’t visible farther north.
比如 他在埃及看到的星星 再往北走就看不到了
Roughly 100 years later,
约一百多年后
humans got their first measurements of the Earth’s curve
人类首次测算了地球曲度
from another Greek mathematician, Eratosthenes.
测算是由另一位希腊数学家埃拉托色尼进行的
He had heard of a city in southern Egypt
他听说埃及南部有一座城市
where, at noon on the summer solstice,
在夏至的那天
the sun was directly overhead and the buildings cast no shadows.
太阳在其正上方 建筑物没有投影
But at the same time in the northern city of Alexandria,
但同时 在北部城市亚历山大
the buildings did cast shadows.
建筑物却有投影
meaning the sun was at a different angle in the sky.
这意味着太阳在天空中的角度不同
On the day of the solstice,
夏至那天
Eratosthenes stuck a stick in the ground in Alexandria
埃拉托色尼在亚历山大市的地面上插了一根木棍
and measured the angle of the shadow.
并且量出了影子的角度
Using the distance between the two cities,
利用两座城市之间的距离
he was able to calculate the curvature of the earth.
他就计算出了地球的曲率
You could perform this same experiment if you have a friend living a few miles away.
要是你有朋友住在几英里外 你可以做同样的实验
Or, if your friend is several hours west,
或者如果你的朋友住在西边几个时区
you can get more proof that the Earth is round
你就能通过在日落时打电话给他们问问天空是怎样的
by calling them at sunset and asking how the sky looks.
而找到更多证据证明地球是圆的
It will still be daylight there because of the Earth’s curve.
因为地球的曲度 那里仍然是白天
And there’s one more piece of clear evidence for the planet’s shape
还有一个明确的证据能够证明地球的形状
— pictures taken from space.
那就是从太空拍摄的照片
Maybe you’re not on Earth after all
也许你根本不在地球上
and are actually watching this video from the space station…
而是从空间站上看这条视频……
in which case, please leave a comment, because that’s so cool.
如果是这样 请留下评论 因为那太酷了
If that’s true,
如果那是真的
you’ll have a bird’s-eye view of this giant blue and green globe.
你就可以鸟瞰这颗蓝绿相间的巨大星球
What a beautiful place to live.
我们住在多么美丽的地方啊!
So what other myths about the Earth do you want me to explore?
还有哪些地球的秘密你想让我探索呢?
Let me know in the comment section below.
在下方的评论区告诉我吧!
Do you love science?
你喜欢科学吗?
Do you love video games?
你喜欢电子游戏吗?
If so, you’ll HAVE to check out Play Noggin,
如果都喜欢的话 你就该去看看Play Noggin
which is an excellent combination of the tube.
那也是油管上很优秀的一个节目
Julian recently explored the idea of mind control.
朱利安最近探索了精神控制的概念
Check it out!
点击这里查看详情!
If the colander of our protagonist puts on his head
如果放在他大脑中的“主过滤器”
allows him to hack into the minds of his less intellectual friends,
就能够让他侵入没他聪明的朋友的意念中
then, in theory, he could exercise control over their actions.
那从理论上来讲 他就可以控制他们的行动
At a basic level, it doesn’t sound too complicated.
在此基础上 精神控制听起来就不是很复杂了
In order to control the activity in an area of our brain,
为了能够控制大脑中某个区域的活动
you need to stimulate it with energy.
你得用能量刺激大脑
My name is Blocko.
我是Blocko
This has been Life Noggin.
这里是《品生活》
Don’t forget to keep on thinking.
别忘了要一直思考哦!

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视频概述

该视频介绍了人类对地球形状的认识过程,并介绍了人类对地球曲度的测算方法。

听录译者

收集自网络

翻译译者

Birdy

审核员

审核员LJ

视频来源

https://www.youtube.com/watch?v=T4WjyTV98lg

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