ASTRON 1101 Lecture Notes - Lecture 8: Hans Lippershey, Friedrich Bessel, Heliocentrism
13 Sep 2016
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Our eyes are good (not perfect) at detecting light. Our vision is blurred on small scales. They let us gather more light and resolve small images. Not known who invented the telescope, but its first astronomical use in the 17th century revolutionized cosmology. October 1608: hans lippershey submitted a patent application. Earliest telescopes were refracting telescopes which use a lens to gather light. Light is bent, or refracted, as it goes from air to glass, or vice versa. A convex lens (thick in the middle) funnels light from a large to small area. A telescope lens can be much larger than the pupil of your eye. Galileo preferred doing experiments to taking aristotle"s word for it. Galileo used his knowledge of optics to make a better telescope with his telescope, he looked at the night sky: his observations supported the heliocentric model. Three observations: the sun has spots, motion of spots indicates the sun is rotating a. i.
