1. The sphere is a circle, the tilt of the earth's axis is 66.5 degrees, and perpendicular to the equatorial plane.
2. The sphere is connected to the support by the earth's axis and can rotate freely and can stop at any position.
3. The products are made up of sphere and bracket.
4. Sphere diameter is 320 ± 5mm, plane scale 1/40000000.
