Main entry: horizon, purview, view
Definition: the range of interest or activity that can be anticipated
Usage: It is beyond the horizon of present knowledge
Main entry: horizon, sensible horizon, skyline, visible horizon, apparent horizon
Definition: the line at which the sky and Earth appear to meet
Main entry: horizon, celestial horizon
Definition: the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
Main entry: horizon
Definition: a specific layer or stratum of soil or subsoil in a vertical cross section of land