Question

When the sun is directly on the top of head, it as referred to _________

(a) Zenith

(b) Azimuth

(c) Declination

(d) Hour angle

The question was posed to me in an interview for job.

Enquiry is from Solar Constant topic in section Solar Energy of Energy Engineering

Answer 1

The correct choice is (a) Zenith

The explanation is: When the sun is directly on the top of the head, it is referred to as sun at zenith. The zenith is an imaginary point directly “above” a particular location, on the imaginary celestial sphere. The zenith is the “highest” point on the celestial sphere.