Interactive photoelectric planetarium are various schools and youth activity centers and other places important demonstration instrument can be simulated to display the day of the stars composing and demonstrates constellation division multiple astronomical sky seasons change and the apparent motion of the stars of the day and night, etc. Knowledge. First, the structure and the main part of the specification l Instrument demonstration by the astrolabe and planetarium panels. l astrolabe panel settings to use depending on the latitude of the horizon circle corresponding astrological observation as the main space; circle surrounding the query time for positioning. l use to apply to the Northern Hemisphere, north planetarium astrolabe very center; accurately drawn major stars, constellations and connections associated with the constellation pattern of Greek mythology, with light tube or fiber marking major stars; draw important clusters, nebulae, such as the ecliptic; astrolabe surrounding query positioning date circle. l flexible and convenient to query and control systems. Second, the main purpose and demonstration shows l apparent motion of the stars Sunday planetarium opened in the normal operating status, the rotating disc demonstrates astrology star Dongsheng goes down and so the apparent motion of the stars of the day and date of the query constellation in the menu, select the required query constellation names, astrology disk automatically locate the horizon circle constellation located central location, then you can look up the constellation constitute relevant division of the sky. On this basis, combining astrology meter run to look up the constellation haunt time; l query specified time will be a combination of the stars circle the date and time using the circle, is about a day and need to check the time combining a month, you can Discover the stars of the time of composition; query by querying the stars of the changing seasons in different seasons at the same time is able to demonstrate the composition of the stars Star seasons change.