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The horizon is the line where the Earth and sky appear to meet. It is the boundary separating the visible sky from the ground or sea, depending on your location.
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Zenith: The point directly overhead an observer, at a 90-degree angle from all points on their horizon.
Altitude: The angular distance of a celestial object above or below the observer's horizon.
Meridian: An imaginary line that runs from north to south and passes through both zenith and nadir.