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The Eclipse Phenomenon

1. The Earth revolves around the Sun and at the same time
the Moon revolves around the Earth.

2. The position of the Moon, and the Earth changes
continuously in their respective orbits. At certain times, the
Sun, Earth and the Moon are aligned in a straight line. At
such time, eclipses occur.

3. There are two types of eclipse;
(i) Eclipse of the moon or lunar eclipse.
(ii) Eclipse of the sun or solar eclipse.

4. One of the properties of light is that it travels in a straight
line. When the ray of light is blocked by an opaque object, a
shadow is formed.

5. The Earth and the moon are opaque objects. When sunlight
is blocked by the Earth or the Moon, the Earth’s or the
Moon’s shadow is formed.

6. There are 2 types of the Earth’s or the Moon’s shadow that
can be formed.
(i) Umbra – a dark shadow region
(ii) Penumbra – a light shadow region. This region receives
a little bit of sunlight.

Eclipse Of The Moon
1. An eclipse of the Moon occurs if;
(a) The Earth, the Moon and the Sun are in a straight line.
(b) The Earth is between the Sun and the Moon

2. The shadow of the Earth falls on the surface of the Moon.
This causes the Moon not to be seen for a while when
observed from the Earth.

3. When the Moon is in the penumbra region, a partial eclipse
of the Moon is observed. At this point, the moon looks like a
crescent when observed from the Earth.

4. When the Moon is in the umbra region, a total eclipse of the
Moon is observed. The Moon cannot be seen at all from the

5. A lunar eclipse lasts longer than a solar eclipse because the
shadow of the Earth is bigger than that of the Moon.

1) When a part of the sunlight is blocked the Moon from reaching the earth, the phenomenon
that occurred is
A eclipse of the Moon
B Moon phases
C eclipse of the Earth
D eclipse of the Sun

2) Which of the following occurs in the Earth during eclipse of the Sun?
I Temperature rises drastically
II Daytime turns dark for a moment
III Shadow of objects are seen clearly
A II only
B I and III only
C II and III only
D I, II and III

3) Which of the following is true about eclipse of the moon?
I Occurs at night
II The Moon appears very bright
III The shape of the Moon appears differently
IV The Moon, the Earth and the Sun are positioned in a straight line
A III and IV only
B I, II and III only
C I, III and IV only
D II, III and IV only

4) Which of the following explains why eclipse of the moon occurs?
A The Sun does not reflect its light to the Moon
B The Moon does not orbit around the Earth
C The shadow of the Moon is formed on the Earth’s surface
D The Earth blocks the sunlight from reaching the Moon

5) A group of pupils gathered at their school to observe an eclipse of the Moon.
At what time did they observe the eclipse of the Moon?
A 8.00 a.m.
B 11.oo a.m.
C 3.00 p.m.
D 8.00 p.m.

6) During an eclipse of the Moon, sunlight is blocked by an opaque object. What is the opaque object?
A The Earth
B The Moon
C The Sun
D A satellite

7) The list below shows the properties of light.
J-Travels in straight line
K-Cannot pass through an opaque object
L-Is reflect by a shiny surface
M-Can pass through a transparent object
Which properties cause the phenomenon of an eclipse?
A J and K
B J and M
C J, K and L
D K, L and M

8 ) An eclipse of the Moon can only occur at the phase of…
A the new moon
B the half moon
C the full moon
D the crescent

9) An eclipse of the Sun can only occur at the phase of…
A the crescent
B the new moon
C the half moon
D the full moon

10) A total eclipse of the Sun will last for…
A an hour
B several hours
C a few minutes
D a few days

The apparatus shown above is to simulate a natural phenomenon that involves the
Sun, the Moon and the Earth.

(i) What is the phenomenon shown above?

(ii) How does the phenomenon occur?

(iii) Can you observe the phenomenon shown above at all places on Earth and at
the same time?

(iv) What is represented by the torchlight, the ping pong ball and the globe?

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