天文

The International Year of Astronomy 2009 is a global celebration of astronomy and its contributions to society and culture, highlighted by the 400th anniversary of the first use of an astronomical telescope by Galileo Galilei.

在2009年国际天文学年是一个全球性的庆祝天文学和其对社会的贡献和文化，突出了400周年的第一次使用天文望远镜的伽利略。

Through this summary,to enable everyone to the past and current situ- ation of astronomical telescope has a clearer understanding as we can understan...

通过本文的总结，使大家能对天文望远镜的过去和现状有更清晰的认识，能为大家了解和研究天文望远镜有所帮助，为其它科学的技术发展提供借鉴。

It deals with the invention and development of time-keeping apparatus in our country during a historical period of some three thousand years, tracing this development from remote antiquity with its sundial and clepsydra making use of the shadow of the sun down to the Dynasties of Han, Sui, Tang and Sung with their water-powered astronomical clockworks...

自远古利用日影的圭表和日晷起，中间经汉、隋、唐、宋等朝代，附装在水力天文仪器上的水力天文钟，都采用了齿轮和凸轮的传动，即已都属于机械性。元代郭守敬以后，到明初的詹希元，更发展到独立时钟机构，並有了指针和表盘。可是近四百年，即自明代万历年间，西洋的自鸣钟传来我国，我国在计时器方面的工作，始终在模制阶段，自己的发明遂归于停顿。那次会议闭幕以后，会中曾用英文出版一次，我国1956年12月，《天文学报》4卷2期用中文出版一次。现在根据一些新资料，重新加以增删和改正。

Although Xing Yunlu's work did not go beyond the mathematic level of Shoushi Computus, it had showed that higher-level mathematics knowledge is also necessary for the scholars in the Ming Dynasty to develop the traditional calendrical astronomy, and the astronomers had provided with some necessary mathematics knowledge in the late Ming Dynasty.

邢云路的此项工作表明，在明代传统天文历法中仍然需要应用较高水平的数学知识，而且历算家也具备了一定的水准，而以往认为的明代天文历法研究没有向数学提出更高要求是导致明代数学发展衰落主要原因之一的观点是需要修正的，至少到明末时期已经随着对传统历法研究的深入而对数学提出了更高的要求。

This method only uses the angles between the stars and the center of Martian moons, Phobos or Deimos, which are got from an image of such objects taken by a star camera.

提出了一种基于纯天文观测的火星车自主天文导航新方法。

An astronomical unit is the length of the semimajor axis of the orbit of a hypothetical planet of mass 1/354710sm and period 365.2563835 msd in elliptic motion about the Sun; that is

天文单位的定义改为：当公转周期为365.2568983263历书日时，一个假想的、质量为零的无摄动行星的椭圆轨道的半长径，等于一个天文单位。

As the astronomical constants between ephemeris calculations, determine the astronomical almanac astronomical constants is also an important part.

由于天文常数关系历表计算，所以确定天文常数也是历书天文学的重要内容。

The dispatch that believe a newspaper the reporter holds from a few days ago " Gu Ge adds Jialinzhi night " mobile spot learns, gu Ge rolled out new astronomy knowledge to search platform, for astronomy lover free study is used.

信报讯 记者从日前举办的"谷歌加加林之夜"活动现场获悉，谷歌推出了新的天文知识搜索平台，供天文爱好者免费学习使用。

In 1976, the International Astronomical Union revised the definition of the AU for greater precision, defining it as that length for which the Gaussian gravitational constant takes the value 0.01720209895 when the units of measurement are the astronomical units of length, mass and time.

但实际上地球绕日的轨道不是一个圆形，而是一个椭圆形：最初天文单位的定义就是上述椭圆的半长轴的长度。1976年，国际天文学联会把一天文单位定义为一颗质量可忽略、公转轨道不受干扰而且公转周期为365.2568983日的粒子与一个质量相等约一个太阳的物体的距离。

This is the kind of" meat and potatoes" information amateur astronomers are eager to glean from an experienced observer.

这就是业余天文爱好者渴望从有经验的天文观测员那里得到的主要信息。

Life. But the intrinsic way of the Internet by wire confines accessing and using of the network information.

然而，Internet固有的有线连接方式大大限制了人们对网络信息的访问和使用。

I have a strong persuasion that this is true .

我坚信这是正确的。