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Related to sensible horizon: rational horizon
sensible horizon[′sen·sə·bəl hə′rīz·ən]
That circle of the celestial sphere formed by the intersection of the celestial sphere and a plane through any point, such as the eye of an observer, and perpendicular to the zenith-nadir line.
The circle of a celestial sphere formed by its intersection with the plane through the eye of the observer and perpendicular to the local vertical. See parallax in celestial altitude.