Seasons

Seasons

Draw

Draw the difference between rotation and revolution.

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Rotation - "spinning"

-24 hours; day/night

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Revolution - "orbit"

-365.25 days; seasons;​

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Rotation vs. Revolution​

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Poll

What is your favorite season?

• Spring

• Summer

• Fall

• Winter

About the Seasons

Seasons

Spring - March ​20th - June 21st

​Summer - June 21st - September 22nd

​Fall - September 22nd - December 21st

Winter - December 21st - ​March 20th

​Equinox - "equal light"; about 12 hrs of daylight

Solstice - ​sun is at maximum or minimum angle

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Important Dates

Spring Equinox - March 20th​

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​Fall Equinox - September 22nd​

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Summer Solstice - June 21st​

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Winter Solstice - December 21st​

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Important Dates

Fill in the Blanks

The approximate daylight hours on an equinox is

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Sunrise and sunset times in Boone

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Scroll down and change the month to March

Find the Spring Equinox date and the day length for that day.

Be ready to answer a question about it on the next slide!​

Multiple Choice

What is the daylength for Boone, IA on the Spring Equinox?

• 11 hrs 15 min

• 12 hrs 0 min

• 12 hrs 9 min

• 12 hrs 26 min

Open Ended

What is the LONGEST day length Boone, IA experiences? (answer should be in hours and minutes)

Comparing Daylight

Spring Equinox - 12hr 9 min

Fall Equinox - ​12 hr 9 min

Summer Solstice (longest daylight) - 15 hrs 14​ min

Winter Solstice (shortest daylight) - ​9 hrs 6 min

​Boone, IA

Quito, Equador

Spring Equinox - 12hr 6 min

Fall Equinox - ​12 hr 6 min

Summer Solstice (longest daylight) - 12 hrs 8 min

Winter Solstice (shortest daylight) - ​12 hrs 6 min

North Alaska​

Spring Equinox - 12hr 42 min

Fall Equinox - ​12 hr 30 min

Summer Solstice (longest daylight) - 24 hrs

Winter Solstice (shortest daylight) - ​0 hrs

WHY DOES THIS HAPPEN???

It's all about the TILT of the Earth!

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Earth is tilted on it's axis (invisible line running from N. Pole to S. Pole) at 23.5^o​

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The Earth's tilt of 23.5 degrees causes it to give N. Hemisphere more direct sunlight in the summer and less direct sunlight in the winter​

SUMMER = tilted towards sun

​WINTER = tilted away from sun

Tilt of the Earth

The Earth revolves around the sun in 365.25 days maintaining the SAME tilt

​Revolution of the Earth around the Sun

The TWO Reasons for Seasons

Some text here about the topic of discussion

Multiple Select

What are the TWO reasons for the seasons?

• Tilt of the Earth

• Rotation of Earth

• Revolultion of Earth

• Distance from the Sun

Open Ended

Exit Ticket: Why is the Northern Hemisphere (including Boone!) warmer in the summertime?