horizon **
apparent horizon
visible horizon
sensible horizon
skyline

It looms on the horizon, visible from everywhere in the city.

In a true whiteout there is no visible horizon.

Better that it should happen below the visible horizon.

Odrade returned her attention to the horizon visible beyond the roof garden: not another sign of life out there in the desert.

Without a visible horizon it was extremely difficult to keep the aircraft in level flight.

The only traces I discover are to the north, over the visible horizon.

However, though the waves curved around the visible horizon somewhat, it was at the cost of poor resolution.

The horizon visible through the B-2's windshield was too high for accurate sighting of ground targets.

The horizon, visible only where the stars ended, was empty.

The only visible horizon was formed by treetops, but that wasn't why she made herself say "Tell us about them."