AS101 Lecture 7

AS101 Lecture 7 - AS101 Lecture 7 Logistics: Pr. Set 2:...

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AS101 Lecture 7 Logistics: • Pr. Set 2: Extended At MasteringAstronomy • Do the NIGHT LAB ASAP Last Lecture: Observing The Moon • Lunar Phases • Lunar Orbit • Lunar Eclipses Today’s Lecture: • Solar Eclipses • Planetary motions • Historic development of Astronomy Special Announcement: The AS101 class roster has 75 students, the Mastering Astronomy site has 63 12 students are missing in action!
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Today is Fall Equinox. The Right Ascension of the Moon is 24H. What is its phase? 1. Full 2. Quarter 3. Gibbous 4. New 5. Crescent
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Phases of the Moon New Moon occurs when the moon and sun have the same R.A. Alexander Anya: What is the R.A. of a New Moon at Autumnal Equinox Simon Wentzell: What is the R.A. of a Full Moon at Autumnal Equinox
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4 Solar eclipse: Time lapse images Total eclipse Annular eclipse Courtesy Kaufmann & Freedman, Un
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Sept 22, 2009 AS101 fall 09 Class 6 Total Solar Eclipse
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Solar eclipse demystified Subtle differences in geometric arrangements of the Sun, Moon and the Earth is responsible for different types of solar eclipses
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Solar Eclipse from Space
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Eclipse Predictions Eclipses recur approx. every 18 yr, 11 1/3 day saros cycle Even then, eclipse location and type vary
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Follow the shadow of the Moon Courtesy Kaufmann & Freedman, Un 10
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When the Sun is between Venus and Earth, what phase is Venus in? 1. Full 2. Quarter 3. Gibbous 4. New 5. Crescent
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Patterns in the sky: Ancient times Curiosity about regular patterns of • day and night • the Sun the Moon • the stars in groups led to record keeping and development of calendars
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Record keeping results Sun, Moon and five planets move against the background stars which remain fixed (the celestial sphere) Efforts to make days, months and years to follow a simple and consistent rule -calendar Modern calendars 97 leap years in 400 years gives 365.2425 days per year (close enough to 365.2422 - occasional tweaking)
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Interesting discovery During their orbit, the planets at times slow down their usual eastward motion - go westward - slows down once again and then follow their original eastward journey This is called retrograde motion An explanation of this motion was one of the key tests of early cosmological studies
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Planetary Motion
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This note was uploaded on 04/14/2011 for the course ASTRO 101 taught by Professor Oppenheim during the Spring '11 term at BU.

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AS101 Lecture 7 - AS101 Lecture 7 Logistics: Pr. Set 2:...

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