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It's almost time for a very special day. Can you guess why?
差不多快到一个非常特殊的日子了。你能猜出原因吗？
No, it's not my birthday …Guess again!
不是，它不是我的生日，再猜！
No, it's not the day of the big parade, either.
不，它也不是大游行的日子。
It's the longest day of the year … and it's the first official day of summer!
它是一年中最长的一天，也是正式进入夏天的第一天！
There are lots of days that might seem really long.
很多日子似乎真得很长。
Maybe you've felt that way when you were excited about something that's going to happen,
也许你对即将发生的事情
like your birthday, or the first day of vacation.
比如你的生日或假期第一天感到兴奋的时候，你就会有这种感觉。
The day before an exciting event can seem like it takes a long time.
激动人心的事件发生的前一天似乎很长。
But even if a day feels that way, it's not really any longer.
但即使你真得感觉一天太长了，它也不是真得加长了。
All days have the same amount of time in them, about 24 hours.
每天的时间都是相同的，大约24小时。
When we say it's the longest day of the year, what we really mean is that there's the longest amount of daylight,
当我们说它是一年中最长的一天时，是说它的白昼最长，
which means that the sun is up for the longest amount of time,
这意味着太阳升起的时间最长，
and it's dark for the shortest amount of time.
而且黑暗的时间最短。
This special day is called the summer solstice, and when it happens, it's officially summer.
这个特殊的日子被称为夏至，当它到来时，就是正式的夏天。
Have you ever noticed that in the winter it gets dark pretty early?
你有没有注意到冬天天黑得很早？
It's probably dark before you even go to bed.
你还没上床，天就黑了。
But in the spring and summer, like now, the sun goes down much later.
但在春天和夏天，比如现在，太阳很晚才下山。
Yeah, that's exactly what you asked about the other day!
是的，这就是你那天问得问题！
Squeaks asked if he could change his bedtime
吱吱问他是否可以改变睡觉时间，
so it's after dark, since he doesn't like going to sleep when it's still light out.
天黑后再睡觉，因为他不喜欢外面还亮着的时候睡觉。
But instead we just changed his curtains so they make the room darker, and that helped, right?
但我们只是改变了他的窗帘，让房间暗下来，这有帮助的，对吧？
We have a summer solstice every year because of the way our planet moves around the sun, and how it's tilted.
我们每年都有一个夏至，这是我们行星围绕太阳的运动方式，以及它的倾斜方式导致的。
Because even though you don't feel it, the Earth is always moving!
因为即使你感觉不到，地球也一直在运动！
It takes a whole year for the Earth to go around the sun one time.
地球绕太阳一周需要一整年的时间。
And while it's moving around the sun,
当地球绕着太阳旋转时，
Earth is also spinning around in place around an imaginary line that we call the axis.
它也围绕着一条我们称之为轴的假想线旋转。
The Earth's axis runs up and down, right through the North Pole and the South Pole.
地轴上下移动，正好穿过北极和南极。
One turn on the Earth's axis takes 24 hours, and that's what makes one day.
地球围绕地轴转一圈需要24小时，这就产生了一天。
But there's something else about the Earth's axis: it isn't exactly straight up and down.
但是地轴还有另一个事实：它并不是垂直上下的。
It's tilted, just a little bit, and it's this tilt that causes the summer solstice!
它是倾斜的，有一点点倾斜，正是这种倾斜导致了夏至！
Right now, the tilt is pointing the northern, or top half of the Earth toward the sun.
现在，地球的倾斜朝向北方，或者说地球的上半部分朝向太阳。
Which means that during one spin, which remember, is 24 hours, a whole day and night
这意味着在一次旋转中，记住，是在24小时，整整一天一夜中，
the top half of the Earth spends more time in the sun than in the dark.
地球上半部分在阳光下的时间比在黑暗中多。
The summer solstice is when the tilt is pointing us exactly toward the sun.
夏至是指地轴倾斜恰好让我们（北半球）朝向太阳的时候。
Here in the top half of the world, that's usually on June 21st, although it's sometimes on June 20th or 22nd.
在世界的上半部分，夏至通常是在6月21日，尽管有时是在6月20日或22日。
Soon, the tilt will start to point more sideways compared to the sun,
不久，地轴开始向远离太阳的地方倾斜，
and eventually it will face away from the sun, on what we call the winter solstice.
最终倾斜角会背向太阳，也就到了我们所说的冬至。
That will be the shortest day of the year, with the least amount of sunlight.
这将是一年中最短的一天，日照最少。
But for now, while we're pointed toward the sun, we get long sunny days!
但是现在，我们正对着太阳时，得到了长长的晴天！
For people who live in the southern half of the world, everything is the opposite.
对于生活在地球南部的人来说，一切都是相反的。
When the Earth's tilt points the top half of the world toward the sun,
当地球的倾斜使其上半部分朝向太阳时，
it points the bottom half away from the sun.
它的下半部分会背向太阳。
So for people who live in places like Australia or South America,
所以对于生活在澳大利亚或南美的人来说，
it's about to be the shortest day of the year, not the longest!
这将是一年中最短的一天，而不是最长的一天！
Their winter solstice is the same day as our summer solstice,
他们的冬至和我们的夏至是同一天，
and their summer solstice is the same day as our winter solstice!
他们的夏至与我们的冬至是同一天！
Since it's almost our summer solstice and the first day of summer,
因为现在是夏至，是夏天的第一天，
I'm going to go stock up on some sunscreens!
我要去备一些防晒霜！
Squeaks and I hope you have a happy solstice, wether it's summer or winter!
我和吱吱希望你有一个快乐的至日，无论是夏至还是冬至！
Thanks for joining us!
感谢您的收看！
If you want to keep learning and having fun with Squeaks and me, hit the subscribe button,
如果你想继续学习，与我和吱吱共度美好时光，就点击订阅吧，
and don't forget to check us out on the YouTube Kids app.
不要忘了在YouTube Kids应用上看我们。
Thanks! We'll see you next time, here at the Fort!
感谢您的收看！我们下期见，沃斯堡等你哦！
