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Horizon

[n] the range of interest or activity that can be anticipated; "It is beyond the horizon of present knowledge"
[n] the line at which the sky and Earth appear to meet
[n] the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
[n] a specific layer or stratum of soil or subsoil in a vertical cross section of land


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Book: Reflection on the Important Things