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A) Ans: solar day is the time it takes for the Earth to rotate about its axis so that the Sun appears in the same position in the sky. A sidereal day is the time it takes for the Earth to rotate about its axis so that the distant stars appear in the same position in the sky.
B) Ans: A day is commonly divided into 24 hours of 60 minutes, with each minute composed of 60 seconds.
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Answer:
1. a mean solar day is 24 hours. the mean sun is an imaginary sun which matches a mean solar day exactly.
2. 24 hrs
3. time is often referred to as a fourth dimension, along with the spatial dimensions.
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