Earth, Moon and Sun

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  • Created by: emily_w
  • Created on: 30-03-14 16:23
How long is a lunar period?
29.5 days
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What is a solar day?
The time between solar transits of the meridian
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What is a sidereal day
The time taken for the Earth to spin on its axis relative to the stars. 4 minutes shorter than a solar day.
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Why do the Sun and Moon appear the same size?
The Sun is 400x bigger than the Moon and 400x further away.
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What is the Earth's rotation period?
23 hours and 56 minutes
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How long does it take the Earth to rotate through 1 degree?
4 minutes
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Why does the Moon appear red at a total lunar eclipse?
The Earth, Moon and Sun are aligned so light from the Sun is scattered by the Earth's atmosphere before it hits the Moon, making it appear red.
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What is the diameter of the Earth?
13,000 km
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How much longer is the Moon's phase cycle than its orbital period?
2.2 days
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Why is the Moon's phase cycle longer than its orbital period?
The Earth orbits the Sun, so the Moon needs more time to get back to its starting position.
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Which part of the Sun is visible at a solar eclipse?
Corona
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What is latitude?
The distance North to South
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What is longitude?
The distance East to West
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What is the meridian?
An imaginary arc going from North to South, directly above the observer
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What are the geographic poles?
The most northern/southern parts of the Earth
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What are the magnetic poles?
Where the magnetic field is attracted downwards
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What are the tropics?
Two imaginary lines where the Sun is directly overhead at noon on either solstice.
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What is the zenith?
The point directly above the observer's head
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Other cards in this set

Card 2

Front

What is a solar day?

Back

The time between solar transits of the meridian

Card 3

Front

What is a sidereal day

Back

Preview of the front of card 3

Card 4

Front

Why do the Sun and Moon appear the same size?

Back

Preview of the front of card 4

Card 5

Front

What is the Earth's rotation period?

Back

Preview of the front of card 5
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