Transparent ball, the ball surface with a transparent crystal beads inlaid stars, and printed with the Milky Way, constellation names, constellation images. Horizon coordinate system complete. Center of the sphere with a diameter of 32 cm transparent blue globe, and can emit blue light after power rotation. Planet instrument in the Arctic at the new timetable plate assembly (needle), long needle for Meridian needle, the needle is too short corner pin, with the use of two needles, you can easily find the time you want to watch the stars at any time (see Instructions). Added sun magnet, the magnet can be adsorbed to the sun's ecliptic date position, it is easy to place the sun in the ecliptic. Purpose: (1) to establish the basic concepts of the celestial coordinates. So that students learn about the celestial coordinate system intuitive, learn how to use celestial coordinates to indicate the exact location of days took a star, like a star of specific height and orientation. (2) the surface of the celestial inlaid with more than more than 700 common stars five stars, etc., more than 60 students to recognize and facilitate the star constellations. (3) demonstrate the Earth's rotation and the relative movement of the celestial sphere. (4) establish the concept of time and space. (5) can be changed to a different geographical latitude regions demonstrate any place, at different times seen the stars. Schedule plate (6) the use of space in the Arctic can be easily obtained at different times of the stars accurately seen.