LESSON PHENOMENON & ESSENTIAL
QUESTION
• https://www.edumedia-sciences.com/en/media/308sundial
• Essential question:
• How does Earth moves through space?
When Earth turns a complete spin on its axis.
It takes one day = 24 hours.
Is a complete path around the sun.
It takes 365 ¼ days = 1 year.
https://www.youtube.com/watch?v=nTxqrUxCjDQ
https://www.youtube.com/watch?v=bjal-ozKSL0
https://www.youtube.com/watch?v=cDed5eXmngE
Rotation
Revolution
Around its axis
Around the sun
Take 24 hours or 1 day
Takes 365 days or 1 year
Causes day and night
Causes the seasons
Earth’s orbit
• Orbit is the path revolving
objects follow.
• Earth's orbit is shaped
like ellipse, flattened
circle.
The imaginary line about which Earth
rotates.
Earth’s axis is tilted.
EARTH’S TILTED AXIS
•
At any point in time, half of Earth’s surface faces the sun and the other half faces away
from the sun. (hemisphere)
•
The tilt of Earth’s axis affects the length of the day.
•
If the axis were not tilted, day and night would each be twelve hours long.
•
There are more hours of daylight and fewer hours of darkness during summer.
•
In winter, the amount of daylight is shorter.
•
https://www.youtube.com/watch?v=Em3TlqNOUsk
EARTH’S TILT AND HEMISPHERES
•
Earth’s tilt causes the sun to strike
different parts of Earth at different
angles.
•
At any point of time, each hemisphere
gets more or less sunlight than the
other.
•
Seasons are caused because of both
Earth’s tilted axis and revolution
around the sun.
•
https://www.youtube.com/watch?v=
e9MU4TouzII
•
https://www.youtube.com/watch?v=
6SzjlsuyTdk
The seasons change as Earth moves around the sun
And the tilt of the Earth’s axis.
The part with least
direct sunlight
The part that gets the
most direct sunlight
Neither the top nor the
bottom half is tilted toward
or away from the sun
THE FOUR SEASONS
•
When the Northern hemisphere tilts away
from the sun, the Northern hemisphere
doesn’t receive much energy from the sun and
temperatures are lower.
•
In the Northern hemisphere, this is winter.
•
The Southern hemisphere is opposite to the
Northern hemisphere.
•
The Southern hemisphere towards the sun, so
sun’s energy is more concentrated. The
surface receives more energy and the
temperature gets warmer.
•
In spring and autumn, both hemispheres
receive equal warmth from the sun making
temperature the same in both hemispheres.
•
https://www.edumediasciences.com/en/media/371-days-and-nightsover-the-year
SUMMER SOLSTICE
•
The summer solstice is when the sun is the
highest at the sky.
•
The northern hemisphere is tilted towards
the sun the most during the summer solstice.
•
During the summer solstice, day time is the
longest.
•
Summer solstice in the Northern hemisphere
occurs around June 21st each year.
•
During the summer solstice in the northern
hemisphere, there is winter solstice in the
southern hemisphere.
•
https://www.khanacademy.org/science/cosmo
logy-and-astronomy/earth-history-topic/earthtitle-topic/pi/season-simulator
WINTER SOLSTICE
•
The winter solstice is when the sun is the lowest at the sky.
•
The northern hemisphere is tilted away from the sun the most during the winter solstice.
•
During the winter solstice, day time is the shortest.
•
Winter solstice in the Northern hemisphere occurs around December 21 st each year.
•
During the winter solstice in the northern hemisphere, there is summer solstice in the
southern hemisphere.
https://www.youtube.com/watch?v=guSb2IrLuvg
EQUINOX
•
During an equinox, day and night are each twelve hours long.
•
In the Northern hemisphere, the spring or vernal equinox occurs around March 21st .
•
In the Northern hemisphere, the autumn equinox occurs around September 21 st .
•
When it's spring equinox in the Northern hemisphere, it's autumn equinox in the Southern
hemisphere.
•
https://www.youtube.com/watch?v=aSfc7gx3RLk
Links:
https://www.youtube.com/watch?v=t6MCtB752AE
https://www.youtube.com/watch?v=f4ZHdzl6ZWg
https://www.youtube.com/watch?v=wz01pTvuMa0
• Important information about the moon.
The moon doesn’t make its own light. It
reflects the light of the sun.
The moon revolves
around Earth.
At any time, half of the
moon is lit by the sun
while the other part is
dark.
How long does it take the moon to
complete revolution around the earth
?
MOON PHASES
• The moon appearance changes as it
revolves around Earth.
• The different shapes of the moon in
the sky are called moon phases.
• As the moon
appears to get
larger, it’s waxing.
• As it appears to
get smaller it’s
waning.
Full moon
Gibbous moon
Moon is almost full.
New moon
Moon is not seen at all.
Quarter moon
Moon is half full.
Crescent
Moon appears to be
silver.
Waxing
Waning
Crescent
Crescent
Third quarter