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GE 150 Astronomy

GE 150 Astronomy. Week #4 February 5 , 2013. Homework. Homework #2 – Due Now Solutions posted on Blackboard Vista after class Homework #3 – Moon Phases Ranking Task Due Thursday Exam #1 Next Tuesday. Lunar Phases II. Rising/Setting/Visibility of Lunar Phases.

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GE 150 Astronomy

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  1. GE 150 Astronomy Week #4 February 5, 2013

  2. Homework • Homework #2 – Due Now • Solutions posted on Blackboard Vista after class • Homework #3 – Moon Phases Ranking Task • Due Thursday • Exam #1 • Next Tuesday

  3. Lunar Phases II

  4. Rising/Setting/Visibility of Lunar Phases Are any Moon phases visible during the day? When does the Moon rise/set? Does it always rise/set at the same time?

  5. Rising and Setting

  6. Moonrise and Moonset during Full Moon: • Full Moon rises as the Sun sets. • The Full Moon is high in south at Midnight. • Full Moon sets as the Sun rises. • Full Moon cannot be seen during the day. W W E E E E W W

  7. Moonrise, Moonset... • Not all Moon phases are visible at all times of the day • Never see a Full Moon during the day • Never see a Crescent Moon at midnight. • Never see the Last Quarter Moon at sunset. • Rising/setting times depend on the details of the Earth-Sun-Moon configuration as viewed from the surface of the rotating Earth.

  8. Phases of the Moon East What time is it when the waxing crescent moon is highest in the sky? When does it first rise? When does it set? West

  9. Phases of the Moon What time is it when the waxing crescent moon is highest in the sky? When does it first rise? When does it set? East West

  10. Phases of the Moon West What time is it when the waxing crescent moon is highest in the sky? When does it first rise? When does it set? East

  11. Phases of the Moon East What moon phase would be rising in the East at 3pm? What Moon phase would be setting in the West at 3pm? West

  12. Phases of the Moon If the Moon is highest in the sky at 9pm today, What phase will the Moon be in three weeks from today?

  13. Lecture Tutorials: Predicting Moon Phases pgs 85-87 Work with your partners! Read the instructions and questions carefully. Discuss the concepts and your answers with one another. Take time to understand it now!!!! Come to a consensus answer you agree on. If you get stuck or are not sure of your answer, ask another group. If you get really stuck or don’t understand what the Lecture Tutorial is asking, ask one of us for help. 2nd Edition pgs83-85

  14. Sun Earth Which Moon position (A-E), shown in the diagram at right, best corresponds with the moon phase shown below? C B D A E Orbit of the Moon

  15. If the Moon were in the phase shown above, what phase would it be in two weeks later? • Full Moon • Waxing Gibbous • First Quarter • Waxing Crescent • New Moon

  16. Which of the situations shown above occurs at a time closest to sunset?

  17. If the moon is in the Full phase today, how many of the moon phases shown above would the moon go through during the next 11 days. • only one • two • three • more than three • none

  18. Which of the following groups of moon phases can be seen (above the horizon) at 3:00 am? • Third Quarter, Waning Crescent, and Waxing Crescent • New Moon, First Quarter, and Waxing Gibbous • Third Quarter, Full Moon, Waning Gibbous • Waxing Crescent, First Quarter, Waxing Gibbous • None of the above is correct

  19. GE 150 Astronomy Week #4 February 9, 2013

  20. Homework • Homework #3 – Due Now • Solutions posted on Blackboard Vista after class • Exam #1 • Next Tuesday • Bring #2 Pencil – Scored by Scantron • Includes material up to/including today • Review Lectures, in-class Tutorials, HW answers

  21. In each phase of the Moon, how much of the Moon’s total surface is lit by the Sun? Half the Moon is always lit by the Sun Except . . .

  22. Eclipses

  23. Solar Eclipses • Sometimes at New Moon, the alignment is just right, allowing the Moon to block the light from the Sun, creating an eclipse

  24. Annular Eclipse Partial Eclipse Total Eclipse Solar Eclipse

  25. Solar Eclipse – the Shadow of the Moon

  26. Solar Eclipses • Path of July 1991 eclipse as seen by the GOES weather satellites (time lapse)

  27. Lunar Eclipse – the Shadow of the Earth • The reddish glow is from light refracted through the Earth’s atmosphere and reflected back to Earth (think sunset)

  28. Lunar Eclipses

  29. Lunar Eclipses Time

  30. Lunar Eclipses Sunlight refracted and filtered through the Earth’s atmosphere Lunar eclipse viewed from the Moon (artist conception)

  31. Lunar Eclipses Forecast Diagram for last total lunar eclipse that occurred total lunar eclipse is Dec 21st 2010 (not visible from east coast) No total lunar eclipses in 2013 visible in Boston. http://eclipse.gsfc.nasa.gov

  32. Why Doesn’t an Eclipse Happen Every Full/New Moon Ecliptic – name derives from “Eclipse Line” “Line of Nodes” – point where the two orbits cross, has to be pointed toward the Sun Moon’s orbit is tilted 5 degrees with respect to the Earth’s orbit Eclipses occur ONLY when the Moon CROSSES the plane of Earth’s orbit around the Sun AND ONLY during the NEW or FULL phases

  33. Everything Must Align Just Right • Moon must be crossing the Earth’s orbit (ecliptic) at the same time it passes either in front of (New Phase; solar eclipse) or behind (Full Phase; lunar eclipse) the Earth • Nodes aligned: Eclipse at B & D • No alignment therefore no Eclipse at A & C, just normal phases

  34. Which positions cause which eclipses • When the ______ is in the _____ phase and is directly in line with the _____ and the ____, you get a ______ eclipse. Moon New Earth Sun solar Full • When the ______ is in the _____ phase and is directly in line with the _____ and the ____, you get a ______ eclipse. Moon Earth Sun lunar

  35. Using Star Charts

  36. Consider the dome of the sky over our heads…. mixing bowl

  37. Consider the dome of the sky over our heads…. W Overhead or Zenith Horizon S N E inverted mixing bowl ….

  38. The Sky Tonight at 7 PM Generated from Astroviewer.com North Star- “Polaris” Zenith Horizon Partial Meridian

  39. The Sky Tonight at 7 PM Map oriented for facingSouth Now oriented for facingNorth North Star- “Polaris” Zenith Horizon

  40. The Sky Tonight at 7 PM Map oriented for facingSouth Orion Horizon

  41. Use the winter triangle to find constellations during winter evenings

  42. Anyone recognize any shapes here?

  43. Pleiades Great Orion Nebula Using Orion in to find other objects Betelgeuse Aldebaran Rigel SIRIUS

  44. Pleiades Seven Sisters Subaru

  45. Orion Nebula

  46. The Sky Tonight at 7 PM Now oriented for facingNorth Now oriented for facingNortheast Map oriented for facingSouth North Star- “Polaris” “Big Dipper” Zenith Horizon

  47. Using the Big Dipper in the northern sky as a way to find other groups of stars

  48. Use the Summer Triangle to find constellations during summer evenings

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