22.2 – The Earth-Moon-Sun System – Part II
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22.2 – The Earth-Moon- 22.2 – The Earth-Moon- Sun System – Part II Sun System – Part II
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22.2 – The Earth-Moon-Sun System – Part II. Do Now. What causes lunar phases?. Do Now. What causes lunar phases? Result of the motion of the moon and the sunlight that is reflected from its surface. Key Word. Perigee Apogee Illuminated. Vocab Words. Solar Eclipse Lunar Eclipse. - PowerPoint PPT Presentation
Transcript of 22.2 – The Earth-Moon-Sun System – Part II
22.2 – The Earth-Moon-22.2 – The Earth-Moon-Sun System – Part IISun System – Part II
Do NowDo NowWhat causes lunar phases?
Do NowDo NowWhat causes lunar phases?◦Result of the motion of the moon and the sunlight that is reflected from its surface.
Key WordKey WordPerigeeApogeeIlluminated
Vocab WordsVocab WordsSolar EclipseLunar Eclipse
Motions of the Earth-Motions of the Earth-Moon SystemMoon SystemEarth has one natural satellite – the moon◦Moon orbits Earth within a period of about a month.◦Perigee – The moon is the closest to Earth
◦Apogee – The moon is the farthest from Earth
◦The motions of the Earth-moon system constantly change the relative positions of the sun, Earth, and moon.◦This results in changes in the appearance of the moon, called the phases of the moon.
02/27/12
http://youtu.be/7vUObZwLJ8A
http://www.youtube.com/watch?v=nXseTWTZlks
Lunar MotionsLunar MotionsSince the moon rotates and
revolves every 27 1/3 days, we only ever see one side of the moon.
Only satellites and Apollo missions have ever seen the back side of the moon.
EclipsesEclipsesEclipses are simply shadow effects.
Solar EclipseLunar Eclipsehttp://
www.youtube.com/watch?v=xwGs8_otT64
Solar EclipseSolar Eclipse http://www.youtube.com/watch?v=XMyqPxFh5Zw&list=PL59BD9065DEAD4B6E
When the moon moves in a line directly between Earth and the sun, it casts a dark shadow on Earth.
Moon must be at a new moon phase and the moon’s orbit must cross the plane of the ecliptic for an eclipse to take place.
http://eclipse.gsfc.nasa.gov/SEdecade/SEdecade2011.htmlNext total for North America is
August 21, 2017
Lunar EclipseLunar Eclipsehttp://youtu.be/2dk--lPAi04http://www.youtube.com/watch?v=0FdeLGpAQwQ
When the moon moves within Earth’s shadow.
Moon must be at a full moon phase and the moon’s orbit must cross the plane of the ecliptic for an eclipse to take place.
More common than solar eclipses.http://eclipse.gsfc.nasa.gov/
eclipse.htmlNext total for North America is
November 13, 2012
Group ActivityGroup ActivityOn page 626, copy and label Figure 15A.
