Earths Rotation, Seasons, Precession and Nutation
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Science
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9th Grade
•
Medium
Standards-aligned
Hector Mendoza-Arias
Used 53+ times
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17 Slides • 4 Questions
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Earths Rotation, Seasons, Precession and Nutation
Mr. Mendoza
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What causes the day and night cycle?
Earth’s axis is the imaginary line that goes through the N & S poles.
Day and night are caused by the rotation of Earth on its axis - spinning towards & away from the Sun. (23.9345 hrs)
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When the Sun “rises” …we are actually spinning TOWARDS it
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When the Sun “sets” …we are actually spinning AWAY FROM it
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Multiple Choice
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Multiple Choice
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Why are there 24 hours in a day?
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There 24 hours in a day because...
Earth spins 15 degrees each hour There are 360 degrees in a circle (the circumference of Earth).
360 divided by 15 is 24 so there are 24 hours in a day!
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What causes the seasons?
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Seasons are caused by...
The tilt of the Earth on its axis as it revolves around (orbits) the Sun.
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Earth's Orbit and Seasons
The tilt of Earth’s axis relative to the ecliptic is 23.5 degrees
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Summer
What causes summer in the northern and southern hemispheres?
When the hemisphere is tilted toward the Sun during Earth’s orbit
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Winter
What causes winter in the northern and southern hemispheres?
When the hemisphere is tilted away from the Sun during Earth’s orbit
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Fun Fact
The seasons in the northern and southern hemispheres are opposite each other because when 1 hemisphere is tilted towards the Sun, the other is tilted away from it
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Changes in The Seasons –
Precession and Nutation
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https://www.youtube.com/watch?v=qlVgEoZDjok
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Multiple Choice
Wobbling around the processional axis
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Multiple Choice
What is the circular offset of Earth’s position due to its rotation on its axis?
Earths Rotation, Seasons, Precession and Nutation
Mr. Mendoza
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