FIELD: teaching demonstration aids. SUBSTANCE: on a front surface of the member 1, simulating a board of land, the Sun simulator 9 is arranged. The simulators 6,7 of Moon and Earth are mounted on the same rotation axle 11, having the handle 10. The member, simulating the board, is in the form of a cup. The movable flat member 2, simulating water level in world ocean, is placed in the cup. A cam of a mechanism for moving the flat member 2 is connected with a rod, arranged in guides. Geometry axis of the rod and the rotation axle 11 are mutually normal, and they mutually cross. EFFECT: enhanced demonstration possibility. 6 cl, 7 dwg
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