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The study of the composition or dynamics of the gaseous layers around planets, often applied to questions on Earth's atmosphere but can be applicable to all planets & moons in the solar system.
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Are longer days attributable to refraction or spacetime curvature?
If the sun were a point and there were no atmospheric refraction, the length of the day would be 12 hours as seen from the equator. (This is true for everyday of the year, not just at the equinox.) An …