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The solar zenith angle is the zenith angle of the sun, i.e., the angle between the sun’s rays and the vertical direction. It is the complement to the solar altitude or solar elevation, which is the altitude angle or elevation angle between the sun’s rays and a horizontal plane.
The Zenith Angle is a science fiction novel by American writer Bruce Sterling, first published in 2004, about a pioneering expert in computer and network security with a traditional hacker personality named Derek Vandeveer. His life irrevocably changes after the September 11, 2001 attacks on the World Trade Center .
24 de may. de 2024 · The zenith angle is an angle measured from the z-axis in spherical coordinates, denoted phi in this work. It is also known as the polar angle and colatitude.
21 de may. de 2024 · The zenith angle is the angle between a point of interest and the zenith — the point directly overhead. In a three-dimensional coordinate system, the zenith is the axis perpendicular to the horizontal plane. Zenith angle is measured from a local zenith, meaning that it changes based on the location of the person or device making ...
In a scientific context, the zenith is the direction of reference for measuring the zenith angle (or zenith angular distance), the angle between a direction of interest (e.g. a star) and the local zenith - that is, the complement of the altitude angle (or elevation angle).
The Sun's zenith angle is the angle that a beam of light makes with a line drawn perpendicular to the surface. Think of the zenith angle as how far the Sun is from being directly overhead. The most intense incoming solar radiation occurs where the Sun's rays strike the Earth at the highest angle.
The zenith angle is defined by (8-61)cosZ=cosϕ cosδsuncoshr+sin δsunsinϕ,where ϕ is latitude, δsun is the declination of the sun (which ranges between +23.5° on 21 June to –23.5° on 22 December),20 and hr is the hour angle (0° ≡ noon).
