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Card 16

Front

What is the observer's zenith?

Back

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Card 17

Front

What is the observer's horizon?

Back

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Card 18

Front

What is skyglow?

Back

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Card 19

Front

What are the main sources of terrestrial light pollution?

Back

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Card 20

Front

How did Eratosthenes determine the Earth's circumference?

Back

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Card 21

Front

What are some flaws in Eratosthenes' method?

Back

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Card 22

Front

What are the main constituents of the Earth's atmosphere?

Back

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Card 23

Front

The atmosphere becomes gradually thinner...

Back

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Card 24

Front

What is the Kármán line?

Back

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Card 25

Front

What are some advantages of the Earth's atmosphere?

Back

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