The tilt of Earth's axis, toward the Sun at some times of the year and away from the Sun at other times, is responsible for the annual cycle of seasons.
地轴的倾斜在一年中的某些时候朝向太阳，而在其它时间远离太阳，造成了每年的季节循环。
At these times of the year, the sun appears to be directly over Earth's equator.
每年的这个时候，太阳出现在地球赤道的正上方。
When Earth's orbit is more elliptical, Earth is actually closer to the sun during part of the year.
当地球的轨道更接近椭圆时，地球实际上在一年的一部分时间里更接近太阳。
In any given year, about a dozen known comets come close to the sun in their orbits, the average person can't see them all, of course.
在任何一年中，大约有十几颗已知的彗星在其轨道中接近太阳。当然，一般人看不到所有的彗星。
It snowed the day before — giving a strange feeling at a time of year when there is virtually no darkness — but on Sunday the sun blazed across the water.
前一天下了雪——在一年中几乎没有黑暗的时候，会有一种奇怪的感觉——但周日，太阳照耀着湖面。
After more flight testing with the sun-powering HB-SIA, the Solar Impulse Team hopes to perform night testing later this year.
HB-SIA 完成多次的太阳能飞行测试之后，阳光推动团队希望今年晚些时候进行夜间飞行测试。
Mars orbits the Sun in 687 days, which means 1 Earth year on Mars is 687 days.
火星绕太阳公转的周期是687天，这意味着火星上的1个地球年是687天。
The reason for a leap day or a leap year is because our calendar does not follow the Earth's orbit around the sun exactly.
闰日或闰年出现的原因是我们的历法并不精确地遵循地球围绕太阳运行的轨道。
To the right there's a drawing of Earth orbiting the Sun, with an arrow pointing to the right. The arrow means one year, the time of it takes the Earth to rotate around the Sun.
一个箭头指向球体右方，那儿有一个地球围绕太阳旋转的图样，这个箭头意味着一年，暗示地球围绕太阳旋转一圈的时间。
The big difference, of course, is the sun, which never sets at this time of the year this far south.
很大不同就是，在这么南边的地方，太阳每年这个时候是从来不会下山的。
This is the only time all year when the Sun is at high noon in your chart acting like a spotlight on you.
太阳正午的时候位于狮子座星盘，好像在关注你一样，这是全年仅有的一次。
The sun makes this shape over a year because Earth rotates on a slightly different axis than the sun, and our planet also travels on an elliptical orbit.
太阳一年内的轨迹形成这种形状是因为地球围绕着与太阳略微不同的轴旋转，而我们的地球也沿着椭圆形轨道运行。
It would also be worthless, since locals already know that the town gets over 300 days of sun every year.
但这毫无意义，因为当地人老早就知道，他们这个小镇子每年超过300天都可以看到太阳。
The Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.
奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。
What sun there is this time of year shines weakly, halfheartedly through the white gauze of clouds, offering not even the slightest pretense of warmth.
一年中此时的太阳发出微弱的光线，懒洋洋地透过薄薄的云层，没有一丝暖意。
Earlier this year Oracle completed the acquisition of Sun Microsystems, which, among other things, makes servers that compete with HP's.
今年早先时候甲骨文公司完成了对太阳微系统公司的并购，其生产的服务器可以惠普公司相抗衡。
Sun Yat-sen University adopts a two-year postgraduate education system.
中大的研究生教育是两年制。
But, perhaps, the most important reason behind the acquisition is Oracle's desire to enter the cloud market through Sun cloud announced earlier this year.
但收购背后最重要的原因或许是Oracle希望借助今年早些时候发布的SunCloud进入云市场。
TSMC Chief technology Officer Jack Sun said last year at an IC-technology forum in Germany that a move to 450mm wafer fabs is important for cost reduction.
台积电首席技术官孙元成在去年于德国举办的一次芯片技术会议上曾表示450mm晶圆厂的设立对芯片厂减少成本具有重大意义。
Since we complete a circle around the sun every year, the stars of summer, such as those in the Big Dipper, are always the stars of summer.
由于每年绕着太阳完成一个循环，夏日里我们所看到的星星，比如北斗七星，它们始终在其他年份的夏天里也都能看得到。
Despite moving at 18 miles per second, it still takes the Earth a year to make it around the Sun.
不管地球的运行速度只有每秒钟18英里，它还是一年又一年地围绕着太阳运转。
At these times of the year, the sun appears to be directly over Earth's equator, and the lengths of the day and the night are equal over most of the planet.
在一年里这两个时间点上，太阳出现在赤道的正上方，并且在地球上绝大多数地方，白天与夜间的长度是相同的。
But here's another fact: the sun provides 86, 000 terawatts of energy every year.
但是现在却存在这样的事实：太阳每年提供给我们的能量有86,000万亿瓦！
This means the northern and southern hemispheres will sometimes point toward or away from the sun depending on the time of year, varying the amount of light they receive and causing the seasons.
这意味着南半球和北半球会在一年的不同时间段朝向太阳或背向太阳，引起接受的光照量的变化和并产生季节变化。
They don't happen often-only about once a year-since the tilted orbits of the sun, moon, and Earth make their alignment rare.
它们并非经常发生，大约只有一年一次，因为太阳，月亮的轨道相互倾斜，它们很少能排成一条直线。
They don't happen often-only about once a year-since the tilted orbits of the sun, moon, and Earth make their alignment rare.
它们并非经常发生，大约只有一年一次，因为太阳，月亮的轨道相互倾斜，它们很少能排成一条直线。
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