天文台

Long before the establishment of Greenwich as the prime meridian, the zero longitude of the entire world had passed directly through Paris, and through the Church of Saint-Sulpice.

在将格林威治天文台确定为本初子午线所经过的一点之前，零度经线正好穿过巴黎，穿过圣叙尔皮斯教堂。

First,the paper summarized and analyzed the definition of the earth prime meridian in different periods,clarified the ambiguous recognition that the earth prime meridian was the meridian passing Greenwich astronomical observatory and gave the rigorous definition about the Earth prime meridian presently.

首先对地球首子午线在不同时期的定义进行了分析和总结，进一步明确了当前对地球首子午线的严格定义，澄清了地球首子午线即过格林尼治天文台的子午线这一模糊认识。

The line passing through the Royal Observatory, Greenwich has been chosen as the international zero-longitude reference line, the Prime Meridian.

穿过格林威治皇家天文台的经线被作为国际零度参考经线，或称为本初子午线。

"Its mean density is only about 0.2 grams per cubic centimeter, or about the density of balsa wood," said study leader Georgi Mandushev of the Lowell Observatory in Arizona.

&其平均密度只有约每平方厘米0.2克，或者说相当于轻质木材的密度，&研究小组组长、亚利桑那州洛厄尔天文台的乔吉·曼德舍夫说，&由于该行星对上层大气的引力相对较小，很可能其中部分大气呈慧尾状而逃逸掉。&

The Moon is just rising and the zodiacal light shines above it, while the Milky Way stretches across the sky opposite the observatory.

月亮刚刚升起，其上方的辉光是黄道光，银河在天文台对面的天空伸展着身姿。（这颗明亮的是不是木星？——gohomeman1注

South of Hong Kong. The wind stre ngth at the center is at le vel 12. The wind movies at a

据天文台报导，香港的正南方向220km处有一台风，其中心风为12级，并以15km/h

As the two clusters that formed MACSJ0025 (each almost a whopping quadrillion times the mass of our Sun) merged at speeds of millions of kilometres per hour, hot gas in the two clusters collided and slowed down, but the dark matter passed right through this smash-up.

图中所示，蓝色的部份显示为暗物质，是由哈勃所得的数据以引力透镜效应的方法获取；而粉红色的部份则是正常物质，正常物质透过星系团的气体放出X射线所表现，并由钱德拉X射线天文台所捕捉。

Making use of structural characteristics of the Lower Latitude Meridian Circle and the error theory of this instrument, we have developed a method used to measure directly instantaneous atmospheric refraction, and moreover built a local observational astronomical refraction model toward the east, south, west and north of Yunnan observatory that is classified according to the star's spectral type.

阐述了云南天文台探讨出的利用低纬子午环的观测原理，在不同方向和不同天顶距直接测定瞬时大气折射值的一套方法，并给出了用实测数据在东、南、西、北4个方向建立的按恒星光谱型分类的大气折射实测模型。

Since there are some disadvantages, such as magnitudes, reference systems and difficulties in observing an asteroid during its motion in its whole orbit, etc., when the asteroid is observed simply by means of the meridian or photograph methods, a new method for observing asteroids with a lower latitude meridian circle and a CCD measuring device is proposed according to the conditions of the geographic latitude of the Yunnan Observatory which can be used to observe the whole orbit of an asteroid.

考虑到单纯用子午方法或照相方法对小行星进行观测存在着因星等、定标星系统，以及难于在小行星运行全轨道上进行观测等方面的不利因素，在本文中，根据云南天文台能观测小行星全轨道的地理纬度条件，提出利用低纬子午环与CCD测量装置相配合，并利用低纬子午环直接提供的定标星，在一个统一的基本仪器系统中，通过对小行星在全轨道上均匀分布的观测，获得高精度的小行星观测资料，以便得到更准确的星表零点改正。

On the special structure of the Lower Latitude Meridian Circle and the practice of determining astronomical refraction in Yunnan observatory,a new method for improving the correction accuracy of the atmo- spheric refraction delay is proposed:the determined data of the astronomical atmospheric refraction values with different azimuths are utilized to find the refractivity and the param- eters of mapping functions for modeling the atmospheric refraction delay correction,which changes with the observing stations and azimuths.

根据云南天文台低纬子午环的特殊结构，和测定大气折射的实践，提出了提高折射延迟改正精度的新方法，即：利用各观测站不同方位从天顶附近直到低地平高度角的天文大气折射实测数据，求解得到折射率差和映射函数的参数，从而建立随测站和随方位而异的大气折射延迟改正模型。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。