Unit Nine - Astronomy - Actual Motions Flashcards

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1
Q

What is the Heliocentric model?

A

The sun is at the center of the solar system

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2
Q

Definition of Rotation

A

Earth spinning on its axis

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3
Q

Definition of Period of Rotation

A

Amount of time to make one complete rotation

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4
Q

What is Earth’s Period of Rotation

A

24 hours

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5
Q

How many degrees is Earth’s tilted axis?

A

23.5

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6
Q

What are the two pieces of evidence that proves that the Earth is rotated?

A
  1. Foucault Pendulum
  2. Coriolis Effect
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7
Q

What is the Foucault Pendulum?

A

When allowed to swing freely, a large pendulum can change it’s path due to Earth’s rotation

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8
Q

Definition of Revolution

A

The motion of one body around another in orbit

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9
Q

What is the Period of Revolution?

A

The amount of time required to orbit the Sun one time

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10
Q

What is evidence of the Earth’s revolution?

A

Parallelism of Earth’s Axis

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11
Q

Definition of Parallelism of Earth’s Axis

A

Earth’s tilted axis (23.5) is always pointed to the same location in the sky, giving us our different seasons.

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12
Q

How do different times in the year affect where the sun rises?

A

Equinox - Sun rises directly east to west

June 21st - Sun rises northeast to northwest

December 21st - Sun rises southeast to southwest

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13
Q

Definition of Ellipse

A

The oval shape of a planet’s orbits

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14
Q

Definition of Eccentricity

A

The degree of flatness or “ovalness” of an ellipse

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15
Q

What is the eccentricity of a perfect circle?

A

0

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16
Q

Definition of Foci

A

Two fixed center points of an ellipse

17
Q

Definition of Major Axis

A

Longest straight lined distance across an ellipse

18
Q

Definition of Minor Axis

A

Shortest straight line distance across an ellipse

19
Q

In the solar system, which foci is widely identified as?

A

Sun

20
Q

When calculating eccentricity, where do you round?

A

To the THOUSANDTH
(0.000)

21
Q

Does Eccentricity Have Units?

A

NO

22
Q

What is the relationship between the foci and eccentricity?

A

The greater the distance between the foci, the great the value of eccentricity.