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Astronomical Telescope is a kind of monocular for sky watching,invented by Galileo, i.e. modern refractor telescope,in addition, there are Newtonian & Dobsonian Reflector telescope named by Newton & Dobson, refractor-reflector telescope named by Cassegrain, include Maksutov-Cassegrain telescopes, Schmidt-Cassegrain telescopes & Rayleigh-Criterion telescopes.
The most related subject is sky watch or astronomical observe, meanwhile, it is also both old and main method for astronomy research now. In general, there are two kinds of telescope system, one is optical telescope, i.e. our main telescopes belong to this kind; another is radio telescopes which are National & Scientific research developing project, few of our telescopes cover this kind.
