ASTR 115: Introduction to Astronomy. Stephen Kane
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1 ASTR 115: Introduction to Astronomy Stephen Kane
2 ASTR 115: Introduction to Astronomy This class is full! Everyone who wants to remain in the class must attend all classes and submit all homework! Sign attendance sheet before leaving today!
3 ASTR 115: Introduction to Astronomy Textbook: The Essential Cosmic Perspective, 7th Edition Homework will be via the Mastering Astronomy web site: (use course ID kane86802). Problems with Mastering Astronomy? Contact their 24/7 tech support or send to Mackenzie Killion Chapter 1 homework is due TONIGHT! In general, homeworks due every Thursday at midnight.
4 ASTR 115: Introduction to Astronomy Help sessions in TH 411 provided by graduate students teaching the ASTR 116 Lab. - Mondays: 9am-1pm - Tuesdays: 9am-10am - Thursdays: 9am-10am, 12pm-2pm - Fridays: 12pm-1pm, 4pm-5pm
5 2.3 The Moon, Our Constant Companion Our goals for learning: Why do we see phases of the Moon? What causes eclipses?
6
7 Why do we see phases of the Moon? Lunar phases are a consequence of the Moon s 27.3-day orbit around Earth.
8 Phases of the Moon Half of the Moon is illuminated by the Sun and half is dark. We see a changing combination of the bright and dark faces as the Moon orbits Earth.
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10 Phases of the Moon: 29.5-day cycle new crescent first quarter gibbous full gibbous last quarter crescent } } waxing Moon visible in afternoon/evening Gets fuller and rises later each day waning Moon visible in late night/morning Gets less and sets later each day
11 Thought Question It s 9 A.M. You look up in the sky and see a moon with half its face bright and half dark. What phase is it? A. B. C. D. first quarter waxing gibbous third quarter half moon
12 Thought Question It s 9 A.M. You look up in the sky and see a moon with half its face bright and half dark. What phase is it? A. B. C. D. first quarter waxing gibbous third quarter half moon
13 We see only one side of the Moon. Synchronous rotation: The Moon rotates exactly once with each orbit. This is why only one side is visible from Earth.
14 What causes eclipses? The Earth and Moon cast shadows. When either passes through the other s shadow, we have an eclipse.
15 Solar Eclipse
16 When can eclipses occur? Solar eclipses can occur only at new moon. Solar eclipses can be partial, total, or annular.
17 Why don t we have an eclipse at every new and full moon? The Moon s orbit is tilted 5 to the ecliptic plane. So we have about two eclipse seasons each year, with a lunar eclipse at full moon and solar eclipse at new moon.
18 Summary: Two conditions must be met to have an eclipse 1. It must be a full moon (for a lunar eclipse) or a new moon (for a solar eclipse). AND 2. The Moon must be at or near one of the two points in its orbit where it crosses the ecliptic plane (its nodes).
19 Predicting Eclipses Eclipses recur with the 18-year, 11 1/3-day saros cycle, but type (e.g., partial, total) and location may vary.
20 2.4 The Ancient Mystery of the Planets Our goals for learning: Why was planetary motion so hard to explain? Why did the ancient Greeks reject the real explanation for planetary motion?
21 Planets Known in Ancient Times Mercury (bottom) Difficult to see; always close to Sun in sky Venus (above Mercury) Very bright when visible; morning or evening star Mars (middle) Noticeably red Jupiter (top) Very bright Saturn (above Mars) Moderately bright
22 Why was planetary motion so hard to explain? Planets usually move slightly eastward from night to night relative to the stars. But sometimes they go westward relative to the stars for a few weeks: apparent retrograde motion.
23 We see apparent retrograde motion when we pass by a planet in its orbit.
24 Explaining Apparent Retrograde Motion Easy for us to explain: this occurs when we lap another planet (or when Mercury or Venus laps us). But it is very difficult to explain if you think that Earth is the center of the universe! In fact, ancients considered but rejected the correct explanation.
25 Why did the ancient Greeks reject the real explanation for planetary motion? Their inability to observe stellar parallax was a major factor.
26 The Greeks knew that the lack of observable parallax could mean one of two things: 1. Stars are so far away that stellar parallax is too small to notice with the naked eye. 2. Earth does not orbit the Sun; it is the center of the universe. With rare exceptions, such as Aristarchus, the Greeks rejected the correct explanation (1) because they did not think the stars could be that far away. Thus the stage was set for the long, historical showdown between Earth-centered and Sun-centered systems.
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