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SOLAR THERMAL

Across
the vertical angle between the sun and horizon.
the angle between the sun and the zenith.
Down
defined as a horizontal angle measured clockwise from a north base line or meridian.
is a traditional unit of heat; it is defined as the amount of heat required to raise the temperature of one pound of water by one degree
A solar powered system used to supply a home with hot water for bathing, clothes, and dishwashing.