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The angle between the sun’s rays and a line perpendicular to the horizontal plane through angle the beam of the sun and vertical is called __________

(a) Solar Azimuth angle

(b) Zenith angle

(c) Altitude angle

(d) Declination

I got this question during a job interview.

My doubt stems from Solar Constant in chapter Solar Energy of Energy Engineering

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The correct option is (b) Zenith angle

Easiest explanation: The angle between the sun’s rays and a line perpendicular to the horizontal plane through angle measured from the north to the horizontal projection of rays is called zenith angle. And it is denoted by θz.

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