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Moon!!!

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The Moon is 384,403 kilometres (238,857 miles) distant from the Earth! ... took it by placing a web-cam on the back of a telescope and videoed our findings. ... – PowerPoint PPT presentation

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Title: Moon!!!


1
Moon!!!
  • How Big Is the Moon and Sun?
  • Whitchurch High School
  • Year 8

2
Earth to the Moon
  • The Moon is 384,403 kilometres (238,857 miles)
    distant from the Earth!
  • Its diameter is 3,476 kilometres (2,160 miles).
  • Both the rotation of the Moon and its revolution
    around Earth takes 27 days, 7 hours, and 43
    minutes.
  • The Moons orbit is not perfectly circular.
  • So the distance is an average!

3
How we carried out our experiment!
4
Moon Distance Experiment
Card Diameter (m) Average Distance to card (m) Average Distance to Moon (m) Diameter of Moon (m)
0.040 4.27 384,000,000 3,600,000
0.050 5.39 384,000,000 3,560,000
0.060 6.68 384,000,000 3,450,000
5
Averages
  • The average diameter of the moon is
    3,536,667metres
  • The Distance to the Moon is 384,000,000 metres!

6
The Ball ExperimentThis will test the ratio
equationthat has just been usedto find the moon
diameter.
7
How to do the ball experiment
  • 1 large ball
  • 1 small ball
  • A ruler
  • Paper and Pen
  • Place your measuring stick with the 0 edge on the
    side of the table
  • Then place the large ball at the other end of the
    meter stick
  • Place the small ball in front of the large ball
    at the point where the small ball eclipses the
    large ball from eye level
  • Look at the end of the measuring stick and record
    how far the small ball was away from the big ball.

8
BALL 2
BALL 1
EYE
B
A
Eye
X
Y
Z
KEY (NOTE MEASUREMENTS ALL IN cm) ABALL 1
DIAMETER BBALL 2 DIAMETER XDIST TO BALL
1 YDIST TO BALL 2
9
our results
B (cm)
A (cm)
Z (cm)
X (cm)
B/A
Z/X
2.7 2.7 2.7 2.7
3.5 3.5 3.5 3.5
9.5 9 .5 9.5 9.5
50.0 100.0 150.0 200.0
17.9 37.0 60.0 76.5
2.8 2.7 2.5 2.6
10
From our results we have concluded that The
ratio of the two distances and the ratio of the
two diameters is the same at about 2.7 B/A
Z/X So this means the method we just used to
measure the diameter of the Moon is valid.
11
Measuring The Sea of Crisis
  • BY Thomas Pacey and Hugo Vine

12
What is the Sea of Crisis
  • The Sea of Crisis is a crater/sea on the moon
  • It looks like this

This is a picture we took of the Sea of Crisis.
We took it by placing a web-cam on the back of a
telescope and videoed our findings. We used a
computer program to stack up the frames and come
out with a brilliant picture like this.
The Sea of Crisis
13
Method
  • We cut a semicircular hole in a piece of
    cardboard that measured 1cm in diameter.
  • We then stuck this up.
  • We then slowly stepped back until the Sea of
    Crisis fitted into the hole.
  • We measured the distance from us to the cardboard
  • We did the experiment four times over and took an
    average result
  • We then used the other groups results to work out
    the approx
  • size of the Sea of Crisis

14
The Results
  • (X) The diameter of the hole in the cardboard,
    0.01m (1cm)
  • (Y) The diameter of the Sea of Crisis
  • in metres
  • (A) The average distance from us to the cardboard
    semicircle was 7.00m
  • (B) The distance from the Moon to the Earth,
    384,000,000m

15
The Answer!
B/A Y/X ,
This is a ratio standing for distance from earth
to moon divided by the distance from us to
cardboard is equivalent to the diameter of the
Sea of Crisis divided by the size of the
semicircle in the cardboard. The diameter of the
Sea of Crisis B / A x X Y The diameter is
550,000m ( Y ) this is to 2 significant figures
16
Conclusion
  • Using ratios we calculated the diameter of the
    Sea of Crisis.
  • We discovered that the diameter of the Sea of
    Crisis is 550,000m
  • We used the distance from Earth to Sun -
    384,000,000m
  • End

17
The Diameter of the Sun
18
The Pinhole Camera
  • We used a pinhole camera to take measurements of
    the sun.

19
What is a Pinhole Projector
A pinhole projector is a box that has a black
surface on 1 side, there is a hole a hole in the
middle of the black surface. On the other side
there is a translucent surface.
20
Hole
Object
Image on screen
This is a pinhole camera
21
The Equation
  • Diameter of the sun height of sun image
  • Sun to pinhole image to pinhole

22
The Numbers Bit
  • Camera 1
  • Measurements-
  • Height of image- 0.2cm
  • Distance from pinhole- 16.7cm
  • Distance to Sun-1.496x10 8km

23
The Answer
  • 0.2cm x 1.496x108 km
  • 16.7cm
  • 1.8x106 km diameter of sun

24
The Numbers bit continued
  • Camera 2
  • Measurements-
  • Height of Image- 0.1cm
  • Distance from Pinhole-14.0cm
  • Distance to Sun-1.5x10 8 km

25
The Answer
  • 0.1cm x 1.496x108 km
  • 14.0cm
  • Diameter of Sun-1.1x10 6 km

26
The Average Size of the Sun
  • 1.8x106km1.1x106km1.45x106 km
  • 2

27
The Actual Answer
  • The Sun diameter is
  • 1,391,980 km
  • Reference GCSE Astronomy

28
_____ ___ _______
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