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Revolution + Earth's tilt = seasons

reason for the seasons in North and South Hemispheres

Meghan Sizemore

on 9 February 2012

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Transcript of Revolution + Earth's tilt = seasons

Rotation R E V O L U T I O N REVOLUTION Earth spinning around and around
on its axis. Earth's rotation
causes day and night to pass. = = Earth traveling around the sun in its orbit. Earth's revolution & Earth's 23.5 degree tilt causes seasons and years to pass. Solstice:

When a hemisphere is tilted toward or away from the sun

Occurs twice a year SUMMER SOLSTICE The first day of summer in the Northern hemisphere

When the Northern hemisphere points TOWARD
the sun
Approximately June 21 The sun's rays hit the Northern
hemisphere closer to a 90 degree

This allows more sunlight to be absorbed
by the earth's surface.
Summer is warmer and there is lots
of daylight!

BUT, did you know??? That at this point, it is actually FARTHEST from the sun! More energy absorped
here where sunlight is direct. Birds-Eye view of Earth revolving around sun: Point: True or False?
One of the reasons for seasons is that the Earth is closer to the sun in the summer and further from the sun in the winter. The first day of winter in the Northern hemisphere
When the Northern hemisphere
points away from the sun

On this day, The Southern hemisphere points toward the sun.
It is the first day of what season in the Southern hemisphere? Daylight During the summer:

The Earth's tilt is also the reason for long days during the summer and short days during the winter. During the summer months,
the northern hemisphere is tilted towards the sun and recieves more direct rays.

The sun is more overhead in the Northern Hemisphere! This is the first day of
what season in the Southern
hemisphere? SUN This man is experiencing constant daylight. In the summer months, the sun never sets above the Arctic circle.

From late March to early September, the North Pole recieves constant daylight.
Winter Solstice
Approximately December 21 This little guy is experiencing complete darkness. Daylight during the winter:

The sun's rays hit the Northern hemisphere at more of an angle because the Southern hemisphere is tilted towards the sun.

The sun rises and sets lower in the sky.

The sun is not directly overhead in the Northern hemisphere during the winter! During the three months of winter, the sun never rises above the Arctic circle.

From late September to Early March, the North Pole is in complete darkness.

DEPRESSING! :( Equinox
When the northern OR southern hemisphere is NOT pointed toward or away from the sun.

Equinox occurs twice a year.

When do you think the eqinox occurs? On the equinox, the Northern and Southern hemispheres receive (and absorb) EQUAL amounts of the sun's rays. Daylight on the EQUINOX:

Daylight is equal everywhere on Earth. Everyone gets 12 hours of daylight and 12 hours of darkness.
Video: What causes the Earth's seasons? Near the equinox dates, At the North Pole,
the sun appears to travel around and around on the horizon....

Before it slowly sinks below the horizon (after the autumnal equinox)


Before it slowly rises higher in the sky (after the spring equinox). How do you think the sun appears at the South pole on the equinox dates?
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