| 摘要 |
The invention relates to a didactic device for demonstrating the astronomic phenomena. According to the invention, the device comprises a square frame (1), wherein there are mounted two semi-circles (2, 2') threaded at ends, mounted by some nuts (14) welded in two diametrally opposed rotation blocks (3, 3') which are fastened by screws or by welding to two opposed bars (5, 5') fastened to the frame (1) by screws or welding, on each of the semi-circles (2, 2') there being mounted two pieces (10, 10') interconnected by gravitational pieces (11, 11'), perpendicularly positionned on the pieces (10, 10') which allow the rotation of some spheres (12, 12') representing the Earth, the frame (1) being fastened in a vertical position by means of two supports (15).
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