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During the last few minutes of sunset and the first few minutes of sunrise, if you...

During the last few minutes of sunset and the first few minutes of sunrise, if you were able to draw a line between you and the Sun, that line would pass through the Earth, meaning that you do not have direct line of sight. Another way of saying this is that the Sun is physically below the horizon. However, you are able to see the Sun during these times due to atmospheric refraction. Give as detailed an explanation as you can of how this occurs.
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