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accurate achromatic achromatic lens amateur aperture arc second array astronomical atmosphere atoms axis bright built Cassegrain celestial centimetres centre century colour detectors developed device diameter disc discovery distance Earth eclipse electrons emission emitted equatorial mounting eyepiece field of view focal length focus Fraunhofer Fraunhofer lines galaxy Galileo giant glass Hale Herschel inches infra-red instru instrument interferometer Kepler kilometres Kitt Peak lens lenses light lines magnitude main sequence Mars measure ment metres millimetre million Moon motion Mount Wilson moving nebula object observations Observatory optical orbit pair parallax parsecs photocathode photographic planet planetary plate polishing position precision primary mirror quadrant quasars radar radiation radio astronomy radio telescope radio waves reflecting telescope reflector refracting refractor result rocket rotation Royal satellite scope sensitive showed signals solar system space spectra spectrum stars stellar Sun's surface tele temperature theory tion tube ultraviolet universe Venus visible wavelength X-ray