Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its...
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Transcript of Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its...
![Page 1: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/1.jpg)
Earth’s Motions
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ROTATION
Earth spinning on its axis is called rotation.
The “AXIS” is an imaginary line passing through Earth’s center through the N. and S. Pole.
The N. Pole points toward the star Polaris
The axis is tilted 23.5° {ch.2}
![Page 3: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/3.jpg)
![Page 4: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/4.jpg)
DAY AND NIGHT
Counterclockwise rotation (In N. Hemisphere)!
Sun (Celestial Sphere; stars) rise in the East and set in the West.
Time of Complete Rotation = ~24 hoursSpeed at Equator = ~1 mile every 3 seconds
= 1,038 miles per hour
{Ch.1}
![Page 5: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/5.jpg)
![Page 6: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/6.jpg)
![Page 7: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/7.jpg)
Oblate Spheroid
Earth’s shape is considered to be the shape of an ellipsoid.
Earth is wider than it is tall.Bulges at equator Flattened at Poles.
![Page 8: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/8.jpg)
Solar vs. Sidereal
Solar Day (SYNODIC)The time it takes Earth to rotate once with respect
to the sun. (Suns Highest point in sky to the next highest point in sky).
Time = 24 hours (mean time)
Sidereal DayThe time it takes the Earth to
rotate once with respect to a reference star.
One 360° RotationTime = 23 hr. 56 min. 1-2: Globe rotates 360° - sidereal
1-3: Globe re-points to sun - synodic
![Page 9: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/9.jpg)
Evidence of Rotation
Foucault PendulumThe pendulum is suspended
above Earth’s Surface.The Earth spins underneath pendulum.
Pendulum seems to change direction because rotation. (ch.8)
![Page 10: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/10.jpg)
Precession
The slow gyration of a spinning body.
Movement around a point or axis.
The top does not fall over as long as it stays spinning.
![Page 11: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/11.jpg)
Earth’s Precession The Earth “WOBBLES” on its axis once every
26,000 years.
Earths precessionmoves opposite to itsrotation.
Earth’s axis will not straightendue to its constant rotation.
![Page 12: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/12.jpg)
Moving Toward VEGA
![Page 13: Earth’s Motions. ROTATION Earth spinning on its axis is called rotation. Earth spinning on its axis is called rotation. The “AXIS” is an imaginary line.](https://reader038.fdocuments.net/reader038/viewer/2022102923/551b8b0b550346d6338b5be1/html5/thumbnails/13.jpg)
Revolution
The movement of one object around another is called revolution.
Earth revolves around the sun in a path called its orbit (Counterclockwise direction). 1 revolution = 365.25 Days (LEAP YEAR?) Rate of Revolution = 66.000 mph