The line which bounds that part of the earth's surface visible to a spectator from a given point; the apparent junction of the earth and sky.

A plane passing through the eye of the spectator and at right angles to the vertical at a given place; a plane tangent to the earth's surface at that place; called distinctively the sensible horizon.

The unbroken line separating sky and water, as seen by an eye at a given elevation, no land being visible.

The chief horizontal line in a picture of any sort, which determines in the picture the height of the eye of the spectator; in an extended landscape, the representation of the natural horizon corresponds with this line.

A plane parallel to the sensible horizon of a place, and passing through the earth's center; -- called also rational horizon or celestial horizon.

An individual layer within the soil which has its own unique charateristics (such as color, structure, texture, or other properties) that makes it different from the others in the soil profile.

1. geologic. A plane of stratification assumed to have been originally horizontal. 2. soil. A layer of soil distinguished by characteristic physical properties. Soil horizons generally are designated by letters (for example, A horizon, B horizon, C horizon).

layers of soil, with properties distinct from those above and/or below

The name of the online library system of the Johns Hopkins University Libraries. All of the main campus libraries with the exception of the APL library can be searched using Horizon. The web address of Horizon is http://catalog.library.jhu.edu

This is the library catalogue which is used to search for items in the library.

the edge of the visible Universe, but not the edge of the Universe since the Universe has no edge.

The software used by SELCO Online Libraries, which includes automated library functions such as circulation, requests, cataloging, serials, notices, and reports.

The limit of a person's range of perception, capabilities, or experience; as, children raised in the inner city have limited horizons.

a limit in which we believe we can attain

The indistinct border, fringe or limit of the visual field or, more generally, of any field of awareness. See also Inner Horizon.