astr-1010 planetary astronomy day - 10. homework homework chapter 2: due today motions of the sun...
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ASTR-1010ASTR-1010Planetary AstronomyPlanetary Astronomy
Day - 10
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HOMEWORKHOMEWORK
Homework Chapter 2: Due Today
Motions of the Sun – Due Today
Exam -1 – Next time– chapters 1 & 2 only.
- Look at Smartworks, Lecture-Tutorials, ClassAction questions, and remember the labs.
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Eclipses!Eclipses!
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There are two types of There are two types of eclipses: Solar and Lunareclipses: Solar and Lunar
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Why don’t we have an eclipse Why don’t we have an eclipse every month?every month?
The moon doesn’t orbit on the Earth’s equator or on the ecliptic
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Eclipses only occur when the Eclipses only occur when the Earth, Sun and Moon all line Earth, Sun and Moon all line
upup
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Lunar Eclipse: the Earth passes Lunar Eclipse: the Earth passes directly between the Sun and directly between the Sun and
MoonMoon
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The Total Lunar EclipseThe Total Lunar Eclipse
Next one is December 21, 2010 in the early morning
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A Solar Eclipse requires A Solar Eclipse requires much more precise much more precise
alignmentalignment
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The Moon’s shadow is not The Moon’s shadow is not large enough to cover the large enough to cover the
EarthEarth
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Solar Eclipses take hours to Solar Eclipses take hours to develop but last only develop but last only
minutesminutes
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During a total eclipse the During a total eclipse the Sun’s corona is visibleSun’s corona is visible
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Partial eclipses are more Partial eclipses are more common than total common than total
eclipseseclipses
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Annular Annular Eclipses Eclipses
occur occur when the when the Moon is at Moon is at
or near or near apogeeapogee
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Predicting EclipsesPredicting EclipsesThe Saros Cycle…18 years 11.3 days
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Lecture – TutorialLecture – Tutorial
Path of the Sun: pg 87Path of the Sun: pg 87• Work with a partner!• Read the instructions and questions carefully.• Discuss the concepts and your answers with one
another.• Come to a consensus answer you both 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.
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Lecture – TutorialLecture – Tutorial
Seasons: pg 91Seasons: pg 91
Homework!You won’t have to turn it in on
Wednesday but there will be questions on the exam out of it