在“宇宙中的地球”教学过程中,学生往往很难将地球自转与时间变化两者联系起来。日常用于计时的钟表,也未能直观地揭示地球自转与时间的本质联系。为此,笔者发明了一种新型时钟,使之既能准确计时,还能表达随时间的流逝,太阳直射位置的移动状况。学生借助该新型钟表,能深刻体会地球自转的地理意义。[设计原理与制作步骤]一、设计原理该发明项目根据地球自转规律,将地球仪“压扁”成钟表;将由于地球自转而导致的太阳直射位置在经线上的移动,演变为太阳时针(太阳直射点的经线方向)的转 It is often difficult for students to relate both the rotation of the Earth and the change of time in the course of teaching Earth in the Universe. The clocks that are used daily for timekeeping also fail to reveal the essential connection between the Earth’s rotation and time intuitively. To this end, I invented a new type of clock that allows accurate timing as well as the movement of the sun’s direct position over time. Students with the new watch, can profoundly understand the geographical meaning of Earth’s rotation. [Design principles and manufacturing steps] First, the design principle The invention of the project according to the law of rotation of the earth, the globe “crushed” into a watch; will be due to the Earth’s rotation caused by the sun’s direct position on the warp movement evolved into the sun’s hour hand (The direction of the sun straight point of the warp) turn