基于正迁移的天球坐标系的教学研究

天球坐标系既是地球概论课程教学中的重点,又是难点。地理坐标系是大一新生已经掌握的知识点,用地理坐标系转化成时角坐标系及第二赤道坐标系,再由时角坐标系转化成地坪坐标系,用第二赤道坐标系转化成黄道坐标系,将时角坐标系与第二赤道坐标系相互转化,进而实现各种天球坐标系的相互转化,方便学生将新知识与已有知识建立联系,形成知识体系,易于学习理解天球坐标系的相关知识。

Celestial coordinate system is both the important and difficult teaching points in the course of An Introduction to Earth.Freshmen of college have already mastered the knowledge of geographic coordinate system.During the teaching of celestial coordinate system,firstly,teacher can teach students to transform geographical coordinate system into angle coordinate system and the second equatorial coordinate system;secondly,transforming angle coordinate system into floor coordinate system,and the second equatorial coordinate system into the ecliptic coordinate system;and then in this way,the angle coordinate system and the second equatorial coordinate system can be transformed reciprocally,eventually,with the result of reciprocal transformation among various celestial coordinate systems.Through the serials of transformations,it is more convenient for students to form a knowledge system by connecting the new knowledge and the knowledge of what have mastered,and students can more easily understand and learn the relevant knowledge of celestial coordinate system.