Planet Earth Part One: The Measurement of Time. The planet we live on is called Earth.
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Transcript of Planet Earth Part One: The Measurement of Time. The planet we live on is called Earth.
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Planet Earth
Part One: The
Measurement
of Time
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The planet we live on is called Earth.
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It is one of nine planets in our Solar System.
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The word Solar
means, “of or having to do
with the sun.”
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These nine planets
orbit around the
sun.
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Each orbit equals one full trip around the sun.
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Notice that the Earth’s orbit around the sun is not a perfect circle.
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Earth’s orbit around the sun is called an “elliptical” orbit because it does form a perfect circle.
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There are two points in Earth’s orbit of the sun that are significant.
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They are the “Perihelion” and the “Aphelion”
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“Perihelion” comes from two
words, “ Peri” meaning
around and “Helios” meaning
sun.
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The “Perihelion” is the point in Earth’s orbit when it comes closest to the sun.
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Aphelion is made up from two words, “Apo” meaning from and
“Helios” meaning sun.
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The “Aphelion” is the point in the Earth’s orbit when it is furthest away from the sun.
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When do you think we
experience our summers, when we are
at the Perihelion or
the Aphelion?
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You’re right! We experience summer when the Earth is at aphelion.
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Even though the Earth is at the point farthest from the sun our hemisphere is tilted towards the sun and we receive more direct sunlight.
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We experience our winter season when Earth is at it’s perihelion because our hemisphere is tilted away from
the sun and we receive less direct sunlight.
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We call the time it takes the Earth to complete an orbit around the sun a year.
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There are twelve months
in our year.
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Four Seasons in our year:
Summer, Fall, Winter, and
Spring.
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There are three
hundred and sixty-
five days in our year.
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We have fifty-two weeks in our year
52
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Each week has seven days
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Each day has twenty-four hours.
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Each hour has sixty minutes.
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Each minute has sixty seconds.
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Are there any questions?
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1.) What planet do we live on?
a.) Mercury
b.) Saturn
c.) Earth
d.) Pluto
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2.) How many planets are in our solar system?
a.) Nine
b.) Seven
c.) Twelve
d.) Five
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3.) What does the word “Solar” mean?
a.) Soul
b.) Son
c.) Sold
d.) Sun
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4.) The nine planets in our Solar System orbit around the?
a.) Middle
b.) Son
c.) Sun
d.) Center
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5.) Each orbit equals ?
a.) One trip around the track.
b.) One trip around the world.
c.) One trip around the sun.
d.) One trip to the principal’s office
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6.) Is Earth’s orbit around the sun a perfect circle?
a.) Yes
b.) No
c.) I don’t know
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7.) The shape of Earth’s orbit is called…?
a.) Circular
b.) Eclipse
c.) Square
d.) Elliptical
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8.) The prefix “peri” means:
a.) Sun
b.) From
c.) Around
d.) At the side of
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9.) The prefix “apo” means:
a.) Sun
b.) From
c.) Around
d.) At the side of
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10.) The prefix “helios” means:
a.) Sun
b.) From
c.) Around
d.) At the side of
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11.) The point in the Earth’s orbit when it comes closest to the sun is called?
a.) Bellerophon
b.) Periodontist
c.) Aphelion
d.) Perihelion
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12.) The point in the Earth’s orbit when it is farthest from the sun is
called?
a.) Bellerophon
b.) Periodontist
c.) Aphelion
d.) Perihelion
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13.) When do we experience our summers?
a.) At Aphelion
b.) At Perihelion
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14.) When do we experience our winters?
a.) At Aphelion
b.) At Perihelion
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15.) We experience summers at aphelion because…?
a.) Our hemisphere is tilted away from the sun and not getting direct sunlight.
b.) Our hemisphere is tilted toward the sun and getting more direct sunlight.
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16.) We experience winters at perihelion because…?
a.) Our hemisphere is tilted away from the sun and not getting direct sunlight.
b.) Our hemisphere is tilted toward the sun and getting more direct sunlight.
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17.) What do we call the time it takes the Earth to complete an orbit around the
sun?
a.) A Decade
b.) A Year
c.) A Century
d.) A Season
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18.) How many months are in a year?
a.) Four
b.) Sixty
c.) Twelve
d.) Fifty-two
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19.) How seasons are there in a year?
a.) Four
b.) Sixty
c.) Twelve
d.) Fifty-two
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20.) What are the names of the four seasons?
a.) _____________________ c.) ______________________
b.) _____________________ d.) ______________________
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21.) How many days are there in a year?
a.) Three Hundred and sixty-five
b.) Sixty
c.) Twelve
d.) Fifty-two
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22.) How many weeks are there in a year?
a.) Four
b.) Sixty
c.) Twelve
d.) Fifty-two
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23.) How many days are there in a week?
a.) Four c.) Twelve
b.) Sixty d.) Seven
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24.) How many hours are in a day?
a.) Four c.) Twenty-four
b.) Sixty d.) Seven
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25.) How many minutes are in an hour?
a.) Four c.) Twenty-four
b.) Sixty d.) Seven
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26.) How many seconds are there in a minute?
a.) Four c.) Twenty-four
b.) Sixty d.) Seven