The angular extent of what can be seen, either with the eye or with an optical instrument or camera.
The horizontal silhouette of a city or building against the sky.
A panel on the front page of a newspaper outlining some of the features to be found inside.
The line at which the earth and sky meet.
A path of movement, especially military movement, producing a silhouette above terrain features visible from the location of likely observers.
To filter by means of the skyline operator.
To outline something against the sky.