# Studyguide1_ast112Sp19 - AST 112 Spring 2019 Tue Thu 10:30...

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AST 112 - Spring 2019 Tue - Thu 10:30 - 11:45 STUDY GUIDE FOR EXAM 1 Appendix A: Units and Astronomical Data a. Look at the Units - remember that I do not use SI Units - just cgs units in class b. Look at the material in Tables A-1 through A-6 c. Review Conversions. Note that if you watch what units you are using then the ones you don’t want will cancel out. d. Review the different types of temperature. I will mostly use the Kelvin scale. e. Review Powers of 10. Addition, subtraction, multiplication and division of exponents. f. Know the prefixes for the metric system. How big is a nanometer? A Megameter? Chapter 1. The Scale of the Cosmos a. Review scientific notation. How do we work with things like 3 x 10 3 times 0.00012 and so on. b. As you read this chapter, make sure that you know the meanings of all the words that are in bold- face type. For example, what is an Astronomical Unit? How big is a light-year? What is a light year?c. Read the Review Questions - try to do the problems. This is true for every chapter and so I won’t repeat this item. d. Look at the Boxes: The Scientific Method; Scientific Arguments Chapter 2. The Sky a. What are the constellations? An imaginary pattern of stars in the night sky Asterisms? Prominent pattern/group of stars typically having a popular name, smaller than constellation How are stars named in each constellation? Stars named for constellation they lie in w/ the brightest star in constellation being alpha and so on What is meant by Alpha Orionis? ( Betelgeuse) Beta Orionis? (rigel) Delta Cephei? (cepheus) b. A smaller magnitude is better than a larger magnitude. c. Look at the material on pages 18-19. Look at the Figures and read the figure captions. Where is Polaris?: north celestial pole d. What is latitude ( angle up/down along a meridian f rom equator to north/south pole) longitude (angle along equator from prime meridian) ? What is the latitude and longitude of Tempe ( 33.43, 111.94) ? What is the Celestial Sphere: imaginary sphere which observer is the center angular measurement, the horizon? ( great circle 90 degree from the earth Where are the zenith and nadir? Zenith is above while nadir is below e. What is a circumpolar star? S tar that never sets at your location/ always above horizon How does the sky appear to change as we move north and south? What is the North Celestial Pole? South Celestial Pole? Celestial Equator? f. Know degrees, minutes of arc, and seconds of arc. Know why the angular diameter is different from the linear diameter. g. What causes Precession. Which star is now the Pole Star? Polaris What star will be the Pole star in 12,000 years? Vega h. What is meant by the Ecliptic? T he path of sun with respect to stars Which stars and constellations are overhead at midnight through the year? Why do they change during the year? (Look at Figure 2-9) i. What is the inclination of the Earth’s Poles to the ecliptic? (23.5 degrees) What is meant by the Vernal and Autumnal

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