Discussion
Which one of the following defines the angle made by the line joining the centers of the sun and the earth with its projection on the equatorial plane?
Answer: A
The angle is the declination.
Solar declination is the angle between the line joining the centres of the Sun and the Earth and its projection on the Earth's equatorial plane. Because the Earth's axis is tilted by about 23.45°, it varies through the year from +23.45° at the June solstice to -23.45° at the December solstice, and is zero at the equinoxes.
Latitude locates a place on Earth, not the Sun. The azimuth angle is measured in the horizontal plane, and the zenith angle between the Sun's direction and the local vertical.
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