I watched a great show last night on PBS, "The Sidewalk Astronomer". It was basically a biographical piece on John Dobson, the extraordinary amateur astronomer. He is very well known in astronomy circles. The "Dobsonian Mount" is named after him. His specialty is building very inexpensive powerful telescopes. A Dobson construction will typically include the base mount (2-axis swivel) of his name sake and a concrete construction tube known as a sonotube (perhaps 10 or 12 inches) for the body of a reflector telescope. He is known for setting up a one of these great scopes on a sidewalk in a city and inviting people to look thru it to a celestial body. What a great thing. He has a great philosophy. I caught a great tidbit in the program last night where he said something like, "People only know the food they eat, the tree, the monkey, the grass, the cat and the dog. People only think in the extents of biology. If we could only get people thinking outside their o...
