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This nifty 3-ball instrument is a portrayal of visual teaching between day and month relative motion, the relative position of the utility model can simulate the day, three months in space, and the image that the running state of the earth, the moon, the scientific explanation of various natural phenomena arising therefrom. Therefore, it is an indispensable auxiliary tool to overcome the abstract teaching, deepen the students to master the law of celestial motion change:
Four seasons: the four seasons and twenty-four solar terms, order and date. moon phase expressed the phase position and day and night on earth.
Pointer: the earth revolution, indicating the earth's seasons and solar terms. rotating components: mounted on the base shaft rotation, one end of the operating handle, the other end of the month, the operation of the gear group.
Rotary table: to support the entire instrument. the handle is connected with the central pipe sleeve of the sun, and the push handle can be started to rotate the gear assembly to carry out demonstration.
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