It is an umbrella that allows you to check the phase change of the moon from the position relationship between the moon and the sun.
Just by going inside the umbrella and going around the center, you can observe the phase of the moon as seen from the earth.
The moon model is a styrofoam sphere with a surface treatment that makes light shadows easily visible, so the difference between the illuminated part and the shadowed part can be seen easily.
Specifications
Size: Approximately phi 1,600 x 920 mm (when in use)