1. (noun) the line at which the sky and Earth appear to meet

• apparent horizon
• sensible horizon
• skyline
• visible horizon

2. (noun) the range of interest or activity that can be anticipated

• purview
• view

3. (noun) the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth

• celestial horizon

1. (noun) the line at which the sky and Earth appear to meet

• line

2. (noun) the range of interest or activity that can be anticipated

• ambit
• compass
• orbit
• range
• reach
• scope

3. (noun) a specific layer or stratum of soil or subsoil in a vertical cross section of land

• stratum

4. (noun) the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth

• great circle

1. (noun) a specific layer or stratum of soil or subsoil in a vertical cross section of land

• geological horizon
• soil horizon