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1. The length of day and
night at different parts
of the earth in different
seasons
By Abdulbari

2. How does the tilt of the earth affect the
seasons?
 The short answer: Earth’s
tilted axis causes the
seasons. Throughout the
year, different parts of
the Earth receive the
Sun’s most direct rays.
So, when the North Pole
tits toward the Sun, it’s
summer in the Northern
Hemisphere. And when
the south pole tilts
towards the sun, it’s
winter in the Northern
Hemisphere.

3. How does the angle of sunlight affect
the seasons?
 Sunlight striking at
an angle is “spread”
across a wider area
compared to sunlight
striking
perpendicular to
Earth’s surface.
Areas that receive
more scattered
sunlight receive less
energy from our Sun.
All of these factors
combine to give
Earth it’s annual
cycle of seasons.

4. What affects the length of days?
 The length of the day changes from season to season
due to the Earth’s axial tilt. The earth’s axis of rotation
is inclined at 23.5 degrees to the plane of the ecliptic.
This causes the seasons. In the northern hemisphere, at
the vernal equinox, which is around the 20th of March.
The Earth’s axis of rotation is perpendicular to the
direction of the Earth to the Sun. The Sun is directly
over the Equator and the days and nights are equal
length everywhere. As time passes, the Sun’s position
moves North and more of the Northern Hemisphere is in
direct sunlight. The days get longer. At the June
Solstice, the sun is over the Tropic of Cancer and the
days are their longest in the Northern Hemisphere.
After the solstice, the Sun’s position moves South until
it is over the Equator at the September Equinox. The
days get shorter in the Northern Hemisphere and the
days and nights are of equal length at the Equinox.

5. Here is a video about the city of Tromsø in
Northern Norway, where the sun never sets,
then never rises.

6. Questions
 When do the days start to get longer?
 What combines to give the Earth it’s annual cycle of seasons?
 When is the Sun over the Tropic of Cancer?

7. Summary
 So far we have learned that the Earth’s tilted axis causes the seasons and that
different parts of the Earth receive the Sun’s most direct Sun Rays then we
learned how the angle of sunlight affects the seasons. Then we learned what
affects the length of days.

8. Thanks, Guys