Discussion
Complement of the Solar Altitude angle is ______.
Answer: A
The complement of the solar altitude angle is the zenith angle.
The solar altitude angle is measured up from the horizontal to the line to the sun. The zenith angle is measured down from the vertical (the zenith) to the same line. Horizontal and vertical are at right angles, so the two angles add up to 90°: zenith angle = 90° − altitude angle.
The azimuth angle measures the sun’s direction in the horizontal plane, from north or south. The hour angle measures the time from solar noon, at 15° per hour. The profile angle is the sun’s altitude projected onto a vertical plane normal to a surface, used in shading design. None of them is defined as 90° minus the altitude.
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