the line at which the sky and Earth appear to meet

[ Syn: apparent horizon , visible horizon , sensible horizon , skyline ]

the range of interest or activity that can be anticipated; It is beyond the horizon of present knowledge

[ Syn: view , purview ]

a specific layer or stratum of soil or subsoil in a vertical cross section of land

the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth

[ Syn: celestial horizon ]