The Earth

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  • Created by: Patrisha
  • Created on: 27-12-12 14:18
What is the diameter of the earth?
13,000 km on average
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How do we know the earth is a sphere?
When you watch a ship sail away the lower half of the ship seems to disappear below the horizon before the top half.
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How did Eratosthenes work out the circumference of the earth?
Alexandria is directly 950 km north of Syene. On June 21st, the summer solstice, the sun is directly overhead in Syene at noon. As Syene is on the Tropic of Cancer it is actually at the Zenith, directly overhead.
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what makes the Earth Special?
It has water, a atmosphere and life
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What is latitude?
The latitude of a location is how many degrees above (N) or below (S) of the equator it is.
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What is longitude?
The longitude of a location is how many degrees east or west of the prime meridian it is.
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Why are reflecting telescopes better?
It is much easier and therefore cheaper to make a large parabolic mirror than it is to make a large lens. Reflectors are therefore a lot cheaper for the same magnifying power.Chromatic aberration is not a problem.
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Other cards in this set

Card 2

Front

How do we know the earth is a sphere?

Back

When you watch a ship sail away the lower half of the ship seems to disappear below the horizon before the top half.

Card 3

Front

How did Eratosthenes work out the circumference of the earth?

Back

Preview of the front of card 3

Card 4

Front

what makes the Earth Special?

Back

Preview of the front of card 4

Card 5

Front

What is latitude?

Back

Preview of the front of card 5
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