© boardworks ltd 2004 1 of 20 © boardworks ltd 2005 1 of 58 astronomy days, years and the seasons
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© Boardworks Ltd 20041 of 20 © Boardworks Ltd 20051 of 58
Astronomy
Days, Years and the Seasons
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The rotation of the Earth
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How long is one day?
24 hours
How long is one year?
365¼ days
The Earth spins on its axis, which is tilted at an angle of 23.5°, and also orbits the Sun.
This causes day and night and the seasons.
Day and night
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sun
ligh
t
It take the Earth 24 hours to complete one rotation about its axis.
Day and night
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The seasons
summer in the US
winter in the US
autumn in the US
spring in the US
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What is the season?
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