Some telescopes overcome these problems with a segmented primary mirror. Aperture size is limited by the purity and weight of the glass lens. Several of the most magnificent telescopes are refractors. Yerkes Observatory's 40-inch refractor is the largest. Not only are the instruments mechanically and aesthetically beautiful, but they are also responsible for pioneering astronomical research that paves the road for present-day discoveries.
Astronomy demands precise clockwork motion of a telescope.
In order to track stars and faint objects in the sky for long hours, the telescope must turn opposite the direction of the Earth. A telescope mount solves this problem. The right ascension axis and the declination . The temperature of a star is dependent on several variables like mass , pressure, density , and radius. Imagine a long thermometer, the length of the Sun's radius.