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Preparation:Observation:Calculation:8 Sun’s diameter in kilometers

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Preparation:Observation:Calculation:8 Sun’s diameter in kilometers 1.1 cm
Use the stick-pin to poke a small hole near the center of one of the envelopes. Mark a location near the top of the broom handle with masking tape (this is where your friend will hold the envelope with the pin-hole). Mark another location near the end of the broom handle with masking tape (this is where you will observe and mark the image). Carefully measure the distance between your two marked locations on your broom handle. Make your measurement to the nearest 0.1 centimeter and record here: _94.6___ cm.

Gather your friend, marked broom handle, two envelopes, pencil, and then head outside. With your friend holding the envelope with the pin-hole at the upper marked position and you holding the other envelope at the lower marked location, align the broom handle such that a small faint image of the Sun’s disk is seen on the lower envelope. You may find it convenient to actually sit on the ground for this procedure. With a pencil, carefully mark the location of opposite sides of the Sun’s disk.

From your marked envelope, carefully measure the size of the projected image of the Sun’s disk to the nearest 0.1 centimeter and record here: __1.1__ cm.

Next, use the relationship below to calculate the Sun’s diameter in kilometers. Note that the distance to the Sun is 1.5 x 10km.

—————————————– = ———————————-

1.5* 10^8km 94.6 cm

Record your calculated value for the diameter of the Sun ______??___ km

 
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