Observatory :: Observatory (n.) A place or building for making observations on the heavenly bodies.
Observatory :: Observatory (n.) A building fitted with instruments for making systematic observations of any particular class or series of natural phenomena.
Observatory :: Observatory (n.) A place, as an elevated chamber, from which a view may be observed or commanded..
Observatory :: Observatory (n.) A lookout on a flank of a battery whence an officer can note the range and effect of the fire.