Astronomy Lecture Outline & Review Questions: Understanding the Moon & Eclipses (Sept 7th), Study notes of Astronomy

Download Astronomy Lecture Outline & Review Questions: Understanding the Moon & Eclipses (Sept 7th) and more Study notes Astronomy in PDF only on Docsity! 1 • From http://www.dslreports.com/forum/remark,16822681 • Uses color saturation http://en.wikipedia.org/wiki/Saturation_(color_theory) Outline for 07 September (Thursday) • Review of Syllabus (~ 5 minutes) • Review topics from Lecture 1-3 (Chapters 1 and 2 of text). (~ 10 minutes) • Understanding the movement and appearance of the moon (Chapter 3 of text) (~ 60 minutes) Homework and Quizzes • There are no quizzes for the lecture and I will not collect homework. At the end of each lecture I will suggest a list problems from the textbook and problems on the "self quiz" available on the textbook CD or the texbook web page. Exams • How I write exams • How I would study for my exam • Good study techniques – Write your own questions – Explain why answers are correct and incorrect – Given image, be able to explain main features Outline for 07 September (Thursday) • Review of Syllabus (~ 5 minutes) • Review topics from Lecture 1-3 (Chapters 1 and 2 of text). (~ 10 minutes) • Understanding the movement and appearance of the moon (Chapter 3 of text) (~ 60 minutes) 2 Outline for 07 September (Thursday) • Review of Syllabus (~ 5 minutes) • Review topics from Lecture 1-3 (Chapters 1 and 2 of text). (~ 10 minutes) • Understanding the movement and appearance of the moon (Chapter 3 of text) (~ 60 minutes) Eventually we want to be able to explain … Guiding Questions 1. Why does the Moon go through phases? 2. Does the moon rotate? 3. Is there such a thing as the “dark side of the Moon”? 4. What is the difference between a lunar eclipse and a solar eclipse? 5. What is the difference between a total and annular eclipse? 6. How often do lunar eclipses happen? When one is taking place, where do you have to be to see it? 7. How often do solar eclipses happen? Why are they visible only from certain special locations on Earth? Key Words • total eclipse • annular eclipse • apogee • perigee • sidereal month • synodic month • solar corona • solar eclipse • umbra • penumbra • new moon • full moon A simple model • Moon executes circular orbit • Moon orbit is in Earth’s ecliptic plane 5 Eventually we want to be able to explain … Lunar eclipses can be either total, partial, or penumbral, depending on the alignment of the Sun, Earth, and Moon Eventually we want to be able to explain … Question • If you were looking at Earth from the side of the Moon that faces Earth, what would you see during – A total lunar eclipse? – A total solar eclipse? The Moon’s rotation always keeps the same face toward the Earth due to synchronous rotation 6 • Two types of months are used in describing the motion of the Moon. • With respect to the stars, the Moon completes one orbit around the Earth in a sidereal month, averaging 27.32 days. • The Moon completes one cycle of phases (one orbit around the Earth with respect to the Sun) in a synodic month, averaging 29.53 days. Time and the Moon • sidereal month, averaging 27.32 days. • sidereal day – 23 hr 56 min • synodic (lunar) month, averaging 29.53 days. • solar day – 24 hr Question • On a certain date the Moon is in the direction of the constellation Gemini as seen from Earth. When will the Moon next be in the direction of Gemini? 1. One year later? 2. 366.2425 days later? 3. One sidereal month later? 4. One synodic month later? Question • On a certain date the Moon is in the direction of the constellation Gemini as seen from Earth. When will the Moon next be in the direction of Gemini? 1. One year later? 2. 366.2425 days later? 3. One sidereal month later? 4. One synodic month later? Eventually we want to be able to explain … 7 Guiding Questions 1. Why does the Moon go through phases? 2. Does the moon rotate? 3. Is there such a thing as the “dark side of the Moon”? 4. What is the difference between a lunar eclipse and a solar eclipse? 5. What is the difference between a total and annular eclipse? 6. How often do lunar eclipses happen? When one is taking place, where do you have to be to see it? 7. How often do solar eclipses happen? Why are they visible only from certain special locations on Earth? Key Words • total eclipse • annular eclipse • apogee • perigee • sidereal month • synodic month • solar corona • solar eclipse • umbra • penumbra • new moon • full moon Review Questions • Textbook Chapter 3 problems: 1-4, 7, 8, 18,23,33. • CD or Online Quiz for Chapter 3: 1-24 • Useful online reference: http://www.hermit.org/eclipse/why_solar.html Question for the Weekend • Draw a diagram that explains which way the moon shadow travels – East to West or West to East Survey 1. What was not clear in this lecture? 2. What concepts covered in this lecture do you think you understand? 3. If you have taken a course that meets one day a week for 3hrs: Do you prefer (a) Meet 1x per week for 3 hrs total? (b) Meet 2x per week for 3 hrs total? (c) Meet 3x for week for 3 hrs total? Please fill out answers on a sheet of paper and place on the table near the back of the room at the end of class