Mitaka “Taiyokei“ (solar system) walk; a collaborative science outreach program by institues, local government, and shopping stores

It is difficult to get a real scale image of the solar system through lecture. A scale model is a classical and one of good solutions (e.g. Handa et al. 2003 , Handa et al. 2008 ). Through this model, people living in or visiting to the city can physically understand the scale of the solar system. This scale gives 1 cm for Earth's diameter and 115 m for 1 AU. However, some gadget is required to make it attractive for public citizens.