AS101 Lecture 2: AS 101 #2
Document Summary
Weekly quiz will open tuesday night 8:30-9, will reopen tuesday night 10. Weekly assignment opens tuesday at 10, multiple attempts so system marks best one. Chapter 2: user"s guide to the sky: patterns and cycles. The goals of this chapter - we will nd answers to four important questions. One of the stellar patterns identi ed by name, usually of mythological gods, people, animals, or objects. The region of the sky containing that star pattern. A named grouping of stars that is not one of the recognized constellations. Most star names are derived from ancient arabic. Many of the ancient star names are still used by modern astronomers. Astronomers measure the brightness of stars using the magnitude scale. This is based on astronomical brightness scale. Hipparchus from rhodes (190-120 bce) was the rst to catalogue stars by their brightness. Ptolemy (140 ce) used the magnitude system.
