The Moon -Around the Earth and in the Sky
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1 The Moon -Around the Earth and in the Sky Our goals for learning: Why do we see phases of the Moon? When do we see the phases of the Moon? What causes eclipses?
2 Why do we see phases of the Moon? Lunar phases are a consequence of the Moon s 27.3day orbit around Earth
3 Phases of Moon Half of Moon is lit by the Sun and half is dark We see a different amount of the bright and dark faces as Moon orbits
4 Phases of the Moon: The View from Earth new crescent first quarter gibbous full gibbous last quarter crescent A 29.5-day cycle } } waxing Moon visible in afternoon/evening. Gets fuller and rises later each day. waning Moon visible in late night/morning. Gets less and sets later each day.
5 Moon Rise/Set by Phase
6 Thought Question What phase of the Moon is this? A. B. C. D. First quarter Waxing crescent Waxing gibbous Third quarter
7 We see only one side of Moon Synchronous rotation: the Moon rotates exactly once with each orbit That is why only one side is visible from Earth
8 Eclipses Definition: When light from an astronomical body is blocked by another body passing between it and the observer.
9 Any object can eclipse another For example there are binary stars called eclipsing binaries, because they are detected when the orbiting star is eclipsed.
10 What causes eclipses? The Astronomical bodies cast shadows. When an object passes through another s shadow, there is an eclipse.
11 Most Common Types of Eclipse Solar Eclipse (Sun is blocked by Moon s shadow) -occurs at New Moon Lunar Eclipse (Moon is blocked by Earth s shadow) -occurs at Full Moon
12 Types of Eclipse Partial - Sun or Moon is partly covered. Total - Sun or Moon is completely covered over and goes dark. Annular - center of Sun is covered over, leaving a ring of light. Penumbral Eclipse - Moon is solely in the penumbral shadow, only mildly darkened.
13 Eclipses Every Month? The Moon s orbit is tilted 5 to ecliptic plane. Most alignments occur above or below the ecliptic. As a result we do not get an eclipse every month.
14 Eclipses Every Month? View from Earth
15 When Do Eclipses Occur? We have about two eclipse seasons each year, when the Sun, Earth and Moon are in alignment and the Moon is on the plane of the ecliptic.
16 When Do Eclipses Occur? We then get a solar eclipse at new moon and a lunar eclipse at full moon.
17 Solar Eclipses
18 Total Solar Eclipses The Sun is 400 times larger than the Moon. The Moon is 400 times closer than the Sun. Consequently, they appear to be about the same angular size.
19 Solar Eclipses Eye Protection Vital!
20 Total Solar Eclipse, 1999
21 Eye Safety Sunlight can permanently burn out the receptors in your eyes. Retinas have no pain sensors, You won't know until it's too late! Eclipses are especially dangerous, since people are deliberately looking at the Sun.
22 Eye Safety Welder's Glass- excellent if expensive. Telescopes with Sun filters -excellent, but need to make sure it dies not get scratched. Pin hole cameras -You do not look at the Sun (it's cheap and works, but is not a cool-looking) Mylar eclipse glasses - cheap but not recommended. (They scratch far too easily, high risk of line blindness)
23 Total Solar Eclipse, Zambia 2001
24 Start of Eclipse
25 Sun partially eclipsed
26 Second Contact : the Beginning of Totality
27 Totality!
28 Zambia at Totality
29 Close-up of Edge during Totality ( Bailey s Beads )
30 Diamond Ring : End of Totality
31 Composite of Entire Eclipse, Zambia 2001
32 Annular Eclipses Moon is further away, so its angular size is slightly smaller than the Sun's angular size.
33 Annular Eclipse Sequence Greenland, 2003
34 Partial Eclipse at Sunset, WA, July 2000
35 Partial Eclipse at Sunset sequence, WA, July 2000
36 Total Lunar Eclipse
37 Lunar Eclipse
38 Moon beginning to be eclipsed (partial)
39 Moon mostly eclipsed
40 Moon eclipsed by penumbra
41 Beginning of Totality
42 End of Totality
43 Moon still in penumbra
44 Moon coming out of shadow
45 Full Sequence of Total Lunar Eclipse
46 Predicting Eclipses Eclipses recur with the 18 yr, 11 1/3 day saros cycle, but type (e.g., partial, total) and location may vary.
47 What have we learned? Why do we see phases of the Moon? Half the Moon is lit by the Sun; half is in shadow, and its appearance to us is determined by the relative positions of Sun, Moon, and Earth during the Moon's orbit. What causes eclipses? Lunar eclipse: Earth s shadow on the Moon Solar eclipse: Moon s shadow on Earth Tilt of Moon s orbit means eclipses occur during two periods each year
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