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Earth’s Motions. What evidence do we have to provide evidence of Earth’s motions and how do calculate its elliptical orbit? Rotation - the movement of an object in a circular motion around a line of axis. Period of Rotation - amount of time to make one complete rotation. Example: Earth rotates 360o in 24 hours. Earth’s Rotation.
8. Which is the best evidence for the Earth's rotation? a. the rising of the Sun b. the motion of a Foucault pendulum c. the changing of the seasons d. the phases of the Moon 9. The Coriolis effect provides evidence that the Earth a. revolves around the Sun b. rotates on its axis c. has a magnetic field 10.
What are Earth’s major motions? Rotation – Spinning on axis; Revolution – Moving around the sun; Precession – Wobbling on axis; Nutation – Zig-zag motion in the wobbling of axis
Imagine a line passing through the center of Earth that goes through both the North Pole and the South Pole. This imaginary line is called an axis. Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth’s rotation.
Earth’s revolution is provided by the changing locations of constellations from month to month in relationship to Polaris changes. Need to know: 1. What is revolution? 2. How long does it take the Earth to revolve around the Sun? year, roughly days 3. At what rate does Earth revolve around the Sun? 4. What degree is the tilt of Earth’s axis? 4.
The Earth takes 23 hours, 59 minutes, and 4 seconds to rotate one time completely. We round it up to 24 hours to match up with the Earth’s changing position around the sun.
Time & Earth’s Motions Rotation – spinning of the Earth on its axis = 24 hrs. causes apparent motion of objects in the sky to move E to W True motion is from west to east 15º/hr or 1º/4 min.
