| 摘要 |
PURPOSE: A diurnal motion board of a solar system is provided to enable a user to understand appearing and disappearing time, southing time, observation time according to the location of a superior planet. CONSTITUTION: A celestial globe background sheet is entirely formed into the shape of a circular plane. The celestial globe background sheet comprises a celestial globe, the horizontal plane interlinking the west point of the east point on celestial globe, a time scale unit for indicating the time according to the circumference of the celestial globe. The cover plate is formed into the same shape with a lower half of the celestial globe of the celestial globe background sheet which is divided into two in east-west direction. The rotational plate couples the celestial globe background sheet and the cover plate to be rotatable. The rotational plate is formed of one among an interior planet rotational plate, a superior planet rotational plate, and a planet rotational plate. |
