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The horizon is the apparent curve that separates the surface of a celestial body from its sky when viewed from the perspective of an observer on or near the surface of the relevant body. This curve divides all viewing directions based on whether it intersects the relevant body's surface or not.
Oct 19, 2023 · The astronomical horizon and true horizon are celestial horizons. Earth-Sky Horizons The local horizon, also called the geometrical horizon, is the visible boundary between the Earth and sky. The local horizon may include trees, buildings, and mountains. The geographic horizon is the apparent boundary between the Earth and sky.
horizon, in astronomy, boundary where the sky seems to meet the ground or sea. (In astronomy it is defined as the intersection on the celestial sphere of a plane perpendicular to a plumb line.) The higher the observer, the lower and more distant is his visible horizon. To one 5 feet (1.5 m) above the surface, the horizon is about 2.8 statute ...
- The Editors of Encyclopaedia Britannica
Jan 26, 2024 · From the International Space Station in orbit, at a height of 420 km, the horizon is more than 2,300 km away; if you were to gaze out of a window, the entire U.S. Eastern Seaboard would be visible.
The horizon is the apparent division between the sky and the ground as viewed from the perspective of an observation close to the surface of a planet or other celestial body (or, if we scale things down, any kind of spherical object much bigger than the observer).
How far away is the horizon? - BBC Science Focus Magazine
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The Celestial Horizon. The horizontal line separating the two hemispheres is called the celestial horizon. It is a continuation into space of the imaginary plane created between you and the horizon around you. If the Earth were flat, the celestial horizon would follow the terrestrial plane.
