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Reasons for the
Seasons
Questions:
Name: ______________
Science-8, Period: ____
Date:_______________
Rotation
Earth _________ on an ______________.
Earth’s__________ – imaginary line passing through Earth’s center from
North to South pole
Earth rotates _____________________
Earth is __________ at an angle of 23.5°
axis is currently pointed at ___________ (the _____________
___________)
Earth _____________ on it’s axis once every ________________.
Earth’s rotation causes _________ & ___________
Earth’s ________ causes celestial objects to appear to move__________
to ______________ in the Northern Hemisphere.
Revolution
movement of one object _________another
Earth revolves around the Sun ________________________
The orbit is almost _________________ but is referred to as an
_________________ _______________
Orbit takes one __________ or __________ days.
Are you there yet?
•
The imaginary line that runs through the north & south poles of the Earth
is called the _____________________.
What’s the diff???...Rotation or Revolution?
The Earth spinning on it’s axis._____________
A baseball player running around the infield. _____________
Takes 1 year. _______________
A top spinning. ________________
Causes day and night. _______________
Takes 24 hours. _________________
The moon circling the Earth. ______________
Summary:
Two Primary Reasons for the Seasons on Earth
1. The Earth is___________ on its axis at _________
2. The angle at which ____________ hits the
Earth as it _______________ around the
Sun.
Seasons occur due to the ________ of Earth’s ________ & _______________
around the Sun.
When the Northern hemisphere tilts towards the Sun = _______________
When the Northern hemisphere tilts away from Sun = _______________.
When the Northern hemisphere is neither tilted toward/away from Sun,
then it is either _________________ or ___________________.
Seasons in the Southern hemisphere are __________ Seasons in the
Northern hemisphere.
If it is Winter here, then Australia is having ____________.
Summary:
Solstices
Solstices occur __________ yearly when the Sun is directly over the Tropic of
Cancer or the Tropic of Capricorn. (“The Tropics” are at 23.5° North and 23.5°
South latitude)
The _________________ Solstice is the____________ day of the year in
the Northern hemisphere because the Sun is directly over the Tropic of
Cancer (23.5ºN) at noon.
The ________________ Solstice is the shortest day of the year in the
Northern Hemisphere because the Sun is directly over the Tropic of
Capricorn (23.5ºS) at noon.
Equinox
Means ___________ amounts of night & day.
They occur __________ each year.
They occur _________-_______ between solstices.
Neither hemisphere _________ towards or away from Sun.
At ________, the Sun directly over the ______________.
Where are we?
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•
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Summary:
This occurs because the Earth’s axis is tilted as it moves around the Sun.
________________
This occurs when the Northern hemisphere is tilted towards the Sun.
________________
This is when the length of day and night are equal. ________________
The shortest and longest days of the year when the noon Sun is directly
overhead at 23.5 degrees. ________________
This occurs when the Northern hemisphere is tilted away from the Sun.
________________
Based on this Night and Day Map…
Summary:
•
What season do you think it is in Carrollton? Explain why.
•
What time do you think it is in Carrollton? Explain your answer.
Reasons for the
Seasons
Questions:
Name: ______________
Science-8, Period: ____
Date:_______________
Rotation
•
Earth spins on an axis.
•
Earth’s axis – imaginary line passing through Earth’s center from North to
South pole
•
Earth rotates counterclockwise
•
Earth is tilted at an angle of 23.5°
•
axis is currently pointed at Polaris (the North Star)
•
Earth rotates on its axis once every 24 hours.
•
Earth’s rotation causes day & night
•
Earth’s rotation causes celestial objects to appear to move east to west
in the Northern Hemisphere.
Revolution
•
movement of one object around another
•
Earth revolves around the Sun counterclockwise
•
The orbit is almost circular but is referred to as an elliptical orbit
•
Orbit takes one year or 365¼ days.
Are you there yet?
•
The imaginary line that runs through the north & south poles of the Earth
is called the axis.
What’s the diff???...Rotation or Revolution?
Summary:
•
The Earth spinning on it’s axis rotation
•
A baseball player running around the infield. revolution
•
Takes 1 year. revolution
•
A top spinning. rotation
•
Causes day and night. rotation
•
Takes 24 hours. rotation
•
The moon circling the Earth. revolution
Two Primary Reasons for the Seasons on Earth
•
•
The Earth is tilted on its axis at 23.5º
The angle at which sunlight hits the Earth
as it revolves around the Sun.
Seasons occur due to the tilt of Earth’s axis & revolution around the Sun.
Summary:
•
When the Northern hemisphere tilts towards the Sun = summer
•
When the Northern hemisphere tilts away from Sun = winter
•
When the Northern hemisphere is neither tilted toward/away from Sun,
then it is either fall or spring
•
Seasons in the Southern hemisphere are opposite seasons in the
Northern hemisphere.
•
If it is winter here, then Australia is having summer
Solstices
Solstices occur twice yearly when the Sun is directly over the Tropic of Cancer
or the Tropic of Capricorn. (“The Tropics” are at 23.5° North and 23.5° South
latitude)
•
The Summer Solstice is thelongest day of the year in the Northern
hemisphere because the Sun is directly over the Tropic of Cancer (23.5ºN)
at noon.
•
The Winter Solstice is the shortest day of the year in the Northern
Hemisphere because the Sun is directly over the Tropic of Capricorn
(23.5ºS) at noon.
Equinox
•
Means equal amounts of night & day.
•
They occur twice each year.
•
They occur half-way between solstices.
•
Neither hemisphere tilts towards or away from Sun.
•
At noon, the Sun directly over the equator
Where are we?
•
•
•
•
•
Summary:
This occurs because the Earth’s axis is tilted as it moves around the Sun.
winter, summer, solstice, equinox (all)
This occurs when the Northern hemisphere is tilted towards the Sun.
summer
This is when the length of day and night are equal. equinox
The shortest and longest days of the year when the noon Sun is directly
overhead at 23.5 degrees. solstice
This occurs when the Northern hemisphere is tilted away from the Sun.
winter
Based on this Night and Day Map…
•
What season do you think it is in Carrollton? Explain why.
It must be summer because the North Pole region is under 24 hours
of daylight.
•
What time do you think it is in Carrollton? Explain your answer.
Since its summer, we would be on daylight savings time. Since the
Sun sets between 8:30 & 9 during the summer and its just setting on
the tip of Florida, then it should be 1-1.5 hours earlier for us (Eastern
time in Florida, central time here). Therefore, it is between 7 & 8 PM
here (~ 7:30 PM)
Summary: