Learning Diagrams to explain homogeneous difference with a serrated elliptical orbit and Earth model

摘要

The present invention in the teaching aids explaining the principle of the time difference by the elliptical orbit, the sun model is a serrated elliptical orbit located at the focal point of the ellipse; Disclosed is a serrated earth model that includes a laser pointer to indicate the direction of the Earth's gaze. The present invention implements the motion of the earth on the elliptical orbit by turning the earth model using a tooth on the elliptical orbit, and enables the user to explain the time difference by changing the length of the day that appears at this time. It has the effect of easily explaining and making it easy to understand.