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1) Typical sundial design: gnomon casting shadow and indicating the time of the day
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2) Reversed concept: the time is indicated by a gap in the surface casting shadows and generating renewable energy
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3) Sun’s apparent path in the sky of Houston during different seasons and times of the day
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4)The shape of the sunpath is simplified into a cylindrical section with the surface perpendicular to the diurnal motion at the equinoxes
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5)The shape is enlarged around noon and tapered at sunrise and sunset. This configuration optimizes the exposure of the photovoltaic cell surface by increasing it during the peak sun hours
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6)An opening oriented in the direction of every solar hour of the day is cut into the surface
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7) A system of louvers oriented to let the sunlight reach the ground one hour at a time while shading the other hours is introduced
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8) The circular shapes of the openings are adjusted to elliptical shapes to project a circular image on the ground.
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9)The different hours are displayed by the sunlight casted in the shape of symbols reminiscent of the face of a clock
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10) Colored glass filters ranging from pink in the morning to blue in the evening filter the sunlight to emphasize the different hours.
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