horizon

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horizon

noun border, boundary, field of view, field of vision, prospect, range, range of vision, realm, skyline, view, vista
References in periodicals archive ?
Countering disorientation in black hole conditions requires disciplined reliance upon flight instruments as discussed for false horizon illusions.
Finally, note that even the sloping of the side of your glareshield has been known to cause an illusion of a false horizon.
The Handbook goes on to note the false horizon visual illusion can lead to spatial disorientation: "A sloping cloud formation, an obscured horizon, an aurora borealis, a dark scene spread with ground lights and stars, and certain geometric patterns of ground lights can provide inaccurate visual information, or false horizon, for aligning the aircraft correctly with the actual horizon.