Earth and Sun Movements

Earth's Movements and The Sun

Multiple Select

Which of earth's movements causes changes to the length of shadows (remember what we learned today about seasonal changes to your shadow length)

• Rotation

• Revolution

Rotation and Revolution

• Our shadow lengths change throughout the day this is because of ROTATION (the sun seems to move through the sky)

• Our shadow lengths also change based on the season we are in. Different seasons have longer and shorter shadows (thanks to the directness or indirectness of the sunlight)

Multiple Select

Which of these apply to the rotation of earth? (Select all that apply)

• It happens around an axis

• It takes one year

• It leads to the changes in the length and direction of our shadows

• It takes 24 hours and gives us day and night

• It makes the sun appear as if it is moving through the sky

Open Ended

What would happen if the earth didn't rotate?

Rotation

• Is the movement of earth on its axis

• It takes 24 hours or one whole day

• It gives us day and night

• It leads to the changes in length and direction of our shadows (it makes it appear as if the sun is moving through the sky)

Multiple Choice

Which of earth's movements causes the changes in Seasons?

• Rotation

• Revolution

Remember REVOLUTION around the SUN lead to the changes in seasons

The tilt of the earth changes the directness of the sunlight which changes the temperatures we experience and the length of daylight we have.

Multiple Select

Select all that apply to earth's revolution

• Causes the changes in seasons

• Causes night and day

• Takes 24 hours

• Takes 365 1/4 days

Multiple Choice

How long does it take the earth to revolve around the sun?

• 365 1/4 days

• 365 days

• 360 days

• 24 hours

365 1/4 days

• Remember it doesn't take the earth exactly 365 days to revolve around the sun.

• It actually takes an extra 1/4 of a day or 6 hours

• To make up for that extra time and still keep us on our calendars, we have leap years every four years. Leap years have one extra day in February.

• 6x4=24... one extra day

Multiple Choice

What is a hemisphere?

• The movement of earth on its axis

• A disease

• Half of the earth

• A band

Hemispheres

• Hemi means half and the earth is a sphere, it literally means half a sphere or half of the earth

• The earth is split into the Northern and Southern Hemisphere by the Equator

• Whatever season it is in the Northern Hemisphere, it is the opposite in the Southern Hemisphere

• Fall is opposite spring, summer is opposite winter

Multiple Choice

Which season is it in the northern hemisphere on option D in this picture?

• Summer

• Winter

• Fall

• Spring

Multiple Choice

What season is it in the SOUTHERN HEMISPHERE on option B?

• Fall

• Spring

Multiple Choice

What season is it in the NORTHERN HEMISPHERE on option C?

• Winter

• Spring

• Summer

• Fall

Multiple Choice

True or False: The earth sits straight up and down on its axis.

• True

• False

The Earth tilts at 23.5 Degrees

This is what leads to changes in seasons during Earth's revolution and changes in the length of days (and shadows throughout the year not throughout the day)

Open Ended

How does the earth revolving around the sun make the seasons happen?

Open Ended

What would happen if earth didn't revolve around the sun?

Earth's Revolution

• Takes 365 1/4 days

• Gives us the different seasons of the year (in combination with the tilt of earth on its axis)

• Is a movement around the sun

Multiple Choice

In which season are your shadows the shortest?

• Summer

• Fall

• Spring

• Winter

Shadows are shortest in the Summer

• Our hemisphere has more direct sunlight in the summer, kind of like when the sun is straight up in the sky at noon during the day

• More direct sunlight means shorter shadows

Multiple Choice

In which season are your shadows LONGER?

• Fall

• Summer

• Spring

• Winter

Winter

• We have more indirect sunlight during the winter

• This acts sort of like the more indirect sunlight we see at sunrise and sunset, leading to longer shadows

Multiple Choice

What's the longest day of the year?

• Summer Solstice

• Winter Solstice

Multiple Choice

What is it called when day and night are exactly equal in length?

• Solstice

• Rotation

• Axis

• Equinox

Poll

How confident are you in your understanding of the earth's movements?

• Very Confident I understand this stuff really well.

• I feel pretty good, I understand it, but sometimes I just confuse rotation and revolution

• I'm still pretty confused

• What are you even talking about?