Space Science Vocab Set 1: Observing Motions

Which best describes HELIOCENTRIC?

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Which best describes GEOCENTRIC?

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What is ROTATION?

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What is REVOLUTION?

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What is an ORBIT?

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What is RETROGRADE MOTION?

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What creates a YEAR on Earth?

• 1 moon revolution
• 1 revolution around the sun
• 1 rotation on it's axis
• 29.5 days

What creates a calendar DAY (24 hours) on Earth?

• 1 revolution around the sun
• 1 rotation on it's axis
• 1 moon revolution
• 29.5 days

How long does it take the Earth to REVOLVE around the SUN?

• 24 hours
• 365 days
• 365.25 days
• 1 month

How long does it take the Earth to ROTATE on it's axis?

• 24 hours
• 365 days
• 365.25 days
• 1 month