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How can we detect Earth's spin? Apparent motion of Sun You will have observed that the sun reappears every 24 hours. There are two common explanations for this. One of them is that the earth rotates with a period of approximately 24 hours - this is the only explanation supported by the scientific evidence. The main alternative had a rather convoluted ...


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Perhaps the least convenient but the most direct is go to the Moon and observe the Earth. The (average) length of day as measured by timing stellar transit to stellar transit, sidereal day, differs by 4 seconds from the length of day defined by timing noon on one day to noon on the next day, solar day. A satellite launched East requires less energy to ...


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The combination of your two questions leads me to believe that what you are really asking is, does the density (or lack of it) of the atmosphere have an effect on the horizontal position of an object that initially is given only vertical momentum? If this interpretation of your question is correct, then I want to start by telling you that you have a reverse ...



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