For ground-based telescopes, I am continually impressed with what amateur astronomers construct in their back gardens, e.g., https://youtu.be/tFZVmVRItbg https:

For ground-based telescopes, I am continually impressed with what amateur astronomers construct in their back gardens, e.g., https://youtu.be/tFZVmVRItbg https://youtu.be/tFZVmVRItbg