The scale of astronomical measurements often surpasses human intuitive imagination. The average distance between the Earth and the Sun—approximately 150 million kilometers—is defined as an "astronomical unit," serving as our primary yardstick for measuring the solar system and beyond. However, the real challenge in understanding this number lies not only in its spatial distance but also in its temporal delay. Even at the speed of light (300,000 kilometers per second), it would take approximately 8 minutes and 20 seconds to travel from the Sun to Earth. This means that the Sun as we see it "at this moment" is actually what it looked like 8 minutes ago. The "Earth-Sun distance" is not merely a length but also a "depth of time" defined by the speed of light. Our interactive exhibit, "The Distance Between the Earth and the Sun" (3000*800*1200mm), aims to make this abstract astronomical scale tangible and understandable. Visitors can choose from historically significant measurement methods
