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"Parallel to the earth" is a somewhat messy phrase used to describe something that stays the same distance above the earth's surface. Of course since the earth's surface is curved, this means that whatever the 'something' is, it also must be curved. Here are a couple of examples: 1). During certain atmospheric conditions (K = infinite), a radio signal launched horizontally propagates 'parallel to the earth', and exactly follows the earth's curvature. 2). Geostationary communications satellites ... like the ones that private homes use those little dishes to receive TV from ... are in circular orbits over the earth's equator. They revolve around the earth once in 24 hours, on paths that are 'parallel to the earth'.

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Q: What means parallel to the Earth?
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