astronomical meridian

Astronomy and Humanities——Si Xiang——dragon,tiger,phoenix and tortoise;

天文与人文—四象——龙、虎、凤、龟

Shuo Wen Jie Zi and Ancient Astronomy;

《说文解字》与古代天文学

Telescopes and astronomy:A 400-year retrospect and future prospects;

望远镜和天文学:400年的回顾与展望

The authors consider this is a new branch of learning in the interdisciplinary between astronomy and disasters.

提出了天文灾害的概念，认为它是天文学与灾害科学交叉研究的一个新的分支学科。

At first,the various fractals of different levels in astronomy and cosmology are introduced.

在引入天文学和宇宙论中不同层次的分形后,把它推广到任意直线型的泛分形理论和一般化的分形天文学。

The method of quantitative calculating of knife edge testing for astronomical mirror polishing is discussed including shadow image CCD real time collecting, image processing and the method of quantitative calculating of clitellum error.

主要介绍天文镜面加工中的刀口定量检验技术，包括阴影图像ＣＣＤ实时采集、图像处理、定量计算。