visible horizon


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Related to visible horizon: sensible horizon

visible horizon

[′viz·ə·bəl hə′rīz·ən]
(astronomy)
That line where earth and sky appear to meet, and the projection of this line upon the celestial sphere.

visible horizon

The circle around the observer where the earth and the sky appear to meet. Also called a natural horizon.
References in periodicals archive ?
This attenuation leads to a gradual decrease in visibility as distance increases and a visible horizon of the supply chain that is fuzzy for the focal agent, much as an individual's visibility becomes less clear as he or she peers off into the physical horizon.
On a low-light night with a barely visible horizon, our detachment OinC, our AWR2, and I launched off USS Lassen (DDG-82) in our SH-60B, Warlord 705.
Then it's by instruments, flying without a visible horizon like you would do in complete cloud.
I have seen some incredible sights: lightning spreading over the Pacific, the Aurora Australis lighting up the entire visible horizon with the city glow of Australia below, the vast plains of Africa, the dunes on Cape Horn, rivers breaking through tall mountain passes, the scars of humanity, the continuous line of life extending from North America, through Central America and into South America and a crescent moon setting over the limb of our blue planet.
Contributing to Mr Kennedy's disorientation, said the sources, were the night sky, a lack of visible horizon over the open water and a haze that blanketed Mr Kennedy's flight path from New Jersey over Long Island Sound to the Vineyard.
Major new developments have occurred or are on the visible horizon, necessitating the generation of this update report.
These events also have occurred on nights without any visible horizon.
Plus, are we talking about the visible horizon, the rational horizon, the artificial horizon, the mental horizon, or the horizontal bar to plain speaking.
The ambient conditions yield no visible horizon and scintillation through the NVGs.

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