Title: Moon!!!
1Moon!!!
- How Big Is the Moon and Sun?
- Whitchurch High School
- Year 8
2Earth 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!
3How we carried out our experiment!
4Moon 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
5Averages
- The average diameter of the moon is
3,536,667metres - The Distance to the Moon is 384,000,000 metres!
6The Ball ExperimentThis will test the ratio
equationthat has just been usedto find the moon
diameter.
7How 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.
8BALL 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
9our 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
10From 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.
11Measuring The Sea of Crisis
- BY Thomas Pacey and Hugo Vine
12What 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
13Method
- 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
-
14The 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
15The 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
16Conclusion
- 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
17The Diameter of the Sun
18The Pinhole Camera
- We used a pinhole camera to take measurements of
the sun.
19What 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.
20Hole
Object
Image on screen
This is a pinhole camera
21The Equation
- Diameter of the sun height of sun image
- Sun to pinhole image to pinhole
22The Numbers Bit
- Camera 1
- Measurements-
- Height of image- 0.2cm
- Distance from pinhole- 16.7cm
- Distance to Sun-1.496x10 8km
23The Answer
- 0.2cm x 1.496x108 km
- 16.7cm
- 1.8x106 km diameter of sun
24The Numbers bit continued
- Camera 2
- Measurements-
- Height of Image- 0.1cm
- Distance from Pinhole-14.0cm
- Distance to Sun-1.5x10 8 km
25The Answer
- 0.1cm x 1.496x108 km
- 14.0cm
- Diameter of Sun-1.1x10 6 km
26The Average Size of the Sun
- 1.8x106km1.1x106km1.45x106 km
- 2
27The Actual Answer
- The Sun diameter is
- 1,391,980 km
- Reference GCSE Astronomy
28 _____ ___ _______