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{adj: circumpolar} (of a celestial body) continually visible above the horizon during the entire 360 degrees of daily travel
"a circumpolar star"

{adj: horizontal} parallel to or in the plane of the horizon or a base line
"a horizontal surface"
<-> vertical, inclined

{adj: risen} (of e.g. celestial bodies) above the horizon
"the risen sun"

{adj: set} being below the horizon
"the moon is set"

{adj: supersonic} (of speed) greater than the speed of sound in a given medium (especially air)
"a supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon"
<-> sonic, subsonic

{adj: vertical, perpendicular} at right angles to the plane of the horizon or a base line
"a vertical camera angle"
"the monument consists of two vertical pillars supporting a horizontal slab"
"measure the perpendicular height"
<-> inclined, horizontal

{adv: clear, all the way} completely
"read the book clear to the end"
"slept clear through the night"
"there were open fields clear to the horizon"

{adv: out of sight, out of view} no longer visible
"the ship disappeared behind the horizon and passed out of sight"

{adv: under} below the horizon
"the sun went under"

{n: B-horizon, B horizon} immediately below the A-horizon; contains deposits of organic matter leached from surface soils

{n: C-horizon, C horizon} beneath the B-horizon and above the bedrock; consisting of weathered rock

{n: artificial horizon, gyro horizon, flight indicator} a navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot

{n: cloud} a cause of worry or gloom or trouble
"the only cloud on the horizon was the possibility of dissent by the French"

{n: column, tower, pillar} anything tall and relatively thin that approximates the shape of a column or tower
"the test tube held a column of white powder"
"a tower of dust rose above the horizon"
"a thin pillar of smoke betrayed their campsite"

{n: culmination} (astronomy) a heavenly body's highest celestial point above an observer's horizon

{n: depression} angular distance below the horizon (especially of a celestial object)

{n: heat lightning} bright flashes of light near the horizon without thunder (especially on hot evenings); usually attributed to distant lightning that is reflected by clouds

{n: horizon, view, purview} the range of interest or activity that can be anticipated
"It is beyond the horizon of present knowledge"

{n: horizontal parallax} the maximum parallax observed when the celestial body is at the horizon

{n: horizontality} the quality of being parallel to the horizon
"houses with a pronounced horizontality"

{n: nacreous cloud, mother-of-pearl cloud} a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon

{n: perpendicularity} the quality of being at right angles to a given line or plane (especially the plane of the horizon)

{n: set} the descent of a heavenly body below the horizon
"before the set of sun"

{n: solar halo, parhelic circle, parhelic ring} a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere

{n: sunset, sundown} the time in the evening at which the sun begins to fall below the horizon
<-> sunrise

{n: sunset} the daily event of the sun sinking below the horizon

{n: twilight} the diffused light from the sky when the sun is below the horizon but its rays are refracted by the atmosphere of the earth

{v: break} come into being
"light broke over the horizon"
"Voices broke in the air"

{v: dip, sink} appear to move downward
"The sun dipped below the horizon"
"The setting sun sank below the tree line"

{v: fixate, settle on} become fixed (on)
"Her eyes fixated on a point on the horizon"

{v: perceive, comprehend} to become aware of through the senses
"I could perceive the ship coming over the horizon"

{v: set, go down, go under} disappear beyond the horizon
"the sun sets early these days"
<-> rise

{v: widen, broaden, extend} extend in scope or range or area
"The law was extended to all citizens"
"widen the range of applications"
"broaden your horizon"
"Extend your backyard"

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