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Unformatted text preview: TAKE-HOME EXP. # 3 Naked-Eye Observations of the Moon (See also Take-Home Exp. #4 which can easily be done at the same time as this one.) You have already seen what the Moon looks like in its various phases, but you may not realize it can be "out" in the day as well as the night. Nor are most people familiar enough with the geometry of the Sun-Moon-Earth system to draw it as easily as you will be able to by the end of this experiment. a. When to make observations of the moon's phases: Anytime you can find the Moon, make an observation. These observations do not have to occur only at the principal phases. Anytime and anywhere you can see the Moon is a good time to make a sketch and record the requested information. b. Dates of the Principal phases of the Moon, Times of Moonrise, and Moonset: When doing this experiment, check your newspaper everyday for the times of moonrise and moonset; they are listed on the weather page. Many calendars show the days of occurrence of the principal phases--new, first-quarter, full, third quarter--of the Moon. Most newspapers have the principal phase dates listed every day. In the view of Earth pictured to the right, the Moon’s orbit is the circle, and incoming sunlight is from the right. The Moon moves counterclockwise around the Earth, taking 28 days to complete its cycle. Starting at the topmost diagram, a “New Moon” phase, seven days elapse between each succeeding diagram. 3rd Qrtr New Earth Moon 1st Qrtr Full Moon New TAKE-HOME EXP. #3 T.H.E. #3-2 ____________________________________________________________________ c. What is wanted: six (6) or more observations spaced out over a month. Your data should range over at least 30 days, so one observation every 4 or 5 days is appropriate. Each of the six observations will contain: 1) a horizon drawing of your actual observation, as perceived, with directions and altitude of the Moon clearly marked 2) a "geometric overhead" view of the earth-moon-sun relationship as viewed from the celestial northern hemisphere. It must clearly mark the position of the observer at the observation time and the position of the moon in its orbit. This is the geometry that "causes" the perceived view. 3) A data table with a name for the perceived phase, time of observation, sky conditions, altitude, and other pertinent information. Look up! Look up! The Moon is out in the daytime, just as often as it is out in the night. Be prepared to record the appropriate information whenever you see the Moon. In making your "phase" diagram, start by facing south , putting west on the right and east on the left of your diagram. Sometimes this won't work because the Moon is too far to the side, but then you can face either east or west or north as needed. Make sure your diagram states clearly which you are facing Use your outstretched arm and hand as described in T.H.E. #1 to estimate and record angular distances. Obtain the altitude in degrees of the Moon directly above, perpendicular to, the horizon line. Also, of the Moon directly above, perpendicular to, the horizon line....
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- Spring '10
- Cultural Anthropology