To Infinity and Beyond Day and Night and The Seasons Power Point Year 7

1. SPACE
Day/Night and Seasons

2. Starter: OUR SOLAR SYSTEM: Answer True or False
The moon goes around the Earth
True
The sun goes around the Earth
False
The Earth is Sphere
True
The moon is the same size as the Earth
False
From Earth the moon looks the same size as the sun
True
The sun is further away from the Earth than the moon
True
The Earth spins on an axis
True
Calendar months are different lengths because the moon
moves at different speeds
False

3. Learning Intention
To understand how day and occur-
To understand why day and night occurs
To understand what causes the season
To understand the effects the tilt of the earth plays on the
season and at the poles
Success Criteria
I understand how night and night occurs-
I understand why day and night occurs-
I understand what causes the season-
I understand the effects the tilt of the earth plays on the
season and at the poles

4. Day and Night
Clickview: Cycles and Seasons
Chapter – Start/Day and Night

5. Day and Night
 We have day and night
on Earth because of the
Earth’s rotation – the
earth spinning around
and around. (1670 km/hr)
 One way to remember
which way the Earth turns
is to remember "w.e.
spin", which means the
Earth spins from west to
east
 ie anticlockwise

6. A view of day and night from
space

7.  The side of the earth
facing the sun is in
daylight.
 The other side of the
earth experiences
night.

8. Clickview Video
Cycles and Seasons
Chapter: Seasons

9. Seasons
 If the Earth was
perfectly balanced, as
it is in this animation,
we wouldn’t have
different seasons and
the sun would always
rise and set at the
same time every day.

10. Seasons
 Every part of the
Earth would receive
an equal amount of
sunlight as the earth
rotated.

11.  As the earth rotates,
everyone on earth
experiences day and
night.
 It takes 24 hours for
the Earth to rotate
once.

12.  But the Earth isn’t
perfectly balanced, it’s
tilted on axis of 23.5
degrees
 The axis is an
imaginary line between
the north and south
poles
 Animation
http://www.metoffice.gov.uk/m

13. …and the earth is also revolving around the sun.

14. The Tilt and its Effect
 The tilt changes how
much sunlight each
part of the earth
receives.
 It is this tilt which
makes our days
longer or shorter and
it’s what causes the
seasons.

15. WHAT ABOUT THE POLES?
 In the Southern Hemisphere during summer,
the South Pole is in constant daylight and the
North Pole is in constant darkness and the
opposite occurs in the northern hemisphere.
 Between summer and winter neither
hemisphere is tilted towards the sun. This
happens during Autumn and Spring.

16.  In the summer, we’re tilted
towards the sun.
 Our days are longer and we
receive more direct sunlight
(which makes it hot)
because the tilt causes
more of the sun’s rays to hit
the earth.
 The longest day is called
the summer solstice
occurring in Australia on
December 21st
/22nd
.
 The diagram across shows
the opposite solstice in the
northern hemisphere