What causes the visible constellations to change throughout the year in the night sky?
Answer
The 'night side' of the planet faces a different direction in space as the Earth revolves around the Sun.
As the Earth moves in its yearly circuit around the Sun, the half of the planet experiencing night is constantly oriented toward a different section of the celestial sphere, revealing different star fields.
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And Why The Stars Change With The Seasons" 5 min. version
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