NASA Pinhole Projector

These 3D printable maps are shaped like the contiguous United States of America and show the paths of solar eclipses traversing the country. Each object contains a pinhole in the center that will provide safe and engaging viewing of changing solar images during stages of a solar eclipse.
Sun shining through the pinhole (for example over a shoulder from the user’s back) will produce an upside-down image of the sun on the ground or other flat surface such as a piece of paper. Most pinhole image viewers prefer the balance between sharpness of focus and brightness of the image that results when the flat surface is 3-6 ft. away from the pinhole.

本套3D可打印地图以美国本土为原型设计，展示了穿越全国的日食路径。每个物体中心均设有孔洞，可提供安全且引人入胜的视角，观测日食各阶段日影像的变化。阳光透过孔洞（例如，从用户背部肩上射出）将在地面或其他平坦表面（如一张纸）上形成太阳的倒影。大多数孔洞影像观赏者偏好当平坦表面距离孔洞3-6英尺时，所形成的聚焦清晰与图像亮度之间的平衡。