英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

SSS 2009-01-01

时间:2010-05-17 01:49来源:互联网 提供网友:木渐浅。   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute  

Happy New Year! And don’t feel bad about taking today off. After all, you’ve traveled far. And I’m not talking about the trip home from the party last night. According to NASA, just by being on the planet Earth in the last year, you’ve zipped about 584 million miles around the sun to get back where you were. At an average speed of about 67,000 miles per hour. Again, not talking about the drive home last night.

Of course, the trip was not a perfect circle. As Kepler showed, the Earth’s orbit is an ellipse, with the sun at one of the two focal points. He also figured out the planet goes faster when it’s at perihelion, nearer the sun, than when it’s at aphelion1, its farthest distance—which would explain why summer seems to zip by, except the seasons are a function of the tilt2 of the Earth’s axis3, not its different distances from the sun. And the Earth rotated 365 and a quarter times during its sweep around the sun. The trip took 8,766 hours. Or 31,557,600 seconds. Or 525,960 minutes just like this one.

Thanks for the minute for Scientific American's 60-Second Science. I'm Steve Mirsky .

 


点击收听单词发音收听单词发音  

1 aphelion kz8zVC     
n.远日点;远核点
参考例句:
  • The point in the orbit nearest the sun is called perihelion,while the point farthest is called aphelion.在轨道上最接近太阳的点被称为近日点,而最远离太阳的点被称为远日点。
  • But it's not that simple either,because the dates of the perihelion and aphelion are also shifting.但这并不是简单的一件事情,因为近日点和远日点的日期都会变换。
2 tilt aG3y0     
v.(使)倾侧;(使)倾斜;n.倾侧;倾斜
参考例句:
  • She wore her hat at a tilt over her left eye.她歪戴着帽子遮住左眼。
  • The table is at a slight tilt.这张桌子没放平,有点儿歪.
3 axis sdXyz     
n.轴,轴线,中心线;坐标轴,基准线
参考例句:
  • The earth's axis is the line between the North and South Poles.地轴是南北极之间的线。
  • The axis of a circle is its diameter.圆的轴线是其直径。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   ellipse  SSS  SSS  ellipse
顶一下
(10)
83.3%
踩一下
(2)
16.7%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴