[answered] Makeup Lab Name ____________________________ ID# __________

Can someone help me out with these? There are some pictures to draw too

Makeup Lab

Name ____________________________ ID# _____________________________ Section___________________________ When Was That Picture Taken?

Occasionally astronomers are called on to testify in court cases or solve historical puzzles

involving objects in the sky. These activities are known as ?forensic astronomy,? In this

lab, you?ll examine photographer Ansel Adams? famous photo Moon and Half Dome.

Adams was notoriously haphazard about recording when and where he took his photos.

Using clues in the photo, you will determine when it was taken.

First off, you?ll need to know a little about moon phases. Obtain a Styrofoam sphere and

a bare bulb or lamp. Put your pencil in the hole in the sphere and hold it 50cm or so from

your face, preferably in a dark area (not outside in the sun!). Aim the lamp or bulb

towards you and the sphere ? you want all the light on the sphere to be from the bulb.

Also, stand at least two meters from the bulb. This will ensure that the light rays from the

bulb are nearly parallel, just as rays of sunlight are parallel for the Earth and Moon.

How much of the entire surface of the sphere is illuminated by the light? Does this

depend on the direction you are looking at the sphere? Imagine the lamp as the sun, the sphere as the moon and your head as the Earth. Your

eyes are in Los Angeles. Move the moon sphere around your head and notice how the

illuminated part seems to change shape. Can you make a crescent moon shape?

What orientation is required of the lamp, you and the sphere for you to see a crescent? Using the sphere and lamp as your model, what is the orientation of Earth, Moon and Sun

when there is a full moon? (Sketch the orientation below in top view and indicate which

portion of the Earth and Moon are shaded.) rev. 013007 Is there an orientation where the side of the Moon being illuminated is not visible from

Earth? If so, describe; if not, explain. Find an orientation where half of the side of the Moon facing the Earth is illuminated by

the sun. How many orientations can you find? Sketch them in top view. Recall that your nose is at the longitude (i.e., the east-west position) of L.A. When it is

noon, which way is your nose pointing? Which way is it pointing at midnight? Illustrate

your answer with a top view sketch of the Earth and Sun. The sun sets in L.A. about 6pm on average during the year. Sketch the direction you are

facing relative to the lamp-sun at sunset for your nose. On your sketch, indicate where on

your head-Earth it is 6pm, midnight, 6am and noon. 2 When the Moon is full, can you see it in the daytime? Explain. At what time of day does a full moon rise? (Your sketches should be very helpful!) Consider the following debate between two students about the cause of the phases of the

Moon.

Student A:

?The phase of the moon depends on how the Moon, Sun and Earth are

aligned with one another. During some alignments only a small part of the

Moon?s surface will receive light from the Sun, in which case we would see

a crescent moon.?

Student B:

?The Moon always gets the same amount of sunlight; it?s just that in some

alignments Earth casts a larger shadow on the Moon. That?s why the

Moon isn?t always a full moon.?

Do you agree or disagree with either or both of the students? Why? 3 The image at right is Ansel Adams?

photo Moon and Half Dome taken in

Yosemite National Park. From the

view of Half Dome in the photo, a

short hike would tell you that Adams

was facing southeast when he took

the photo.

Describe the moon phase in the

photo, and illustrate your answer with

a sketch of the Sun-Earth-Moon

orientation. Using your sketches and the sphere and lamp model, at approximately what hour of day

or night was picture taken? How can you tell? What season is it? There are clues in the photo, especially once you know the time of

day. Support your answer with evidence from the photo. 4

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