horizons

[horizon.n.01] as in: the line at which the sky and Earth appear to meet

[horizon.n.02] as in: the range of interest or activity that can be anticipated

[horizon.n.03] as in: a specific layer or stratum of soil or subsoil in a vertical cross section of land

[horizon.n.04] as in: the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth

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