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All daylight harvesting systems use a light level sensor, a photosensor, to detect the prevailing light level, luminance or brightness, in open-loop or closed-loop systems. Photosensors are used to adjust electric lighting based on the available daylight in the space.
The source of all daylight is the Sun. The proportion of direct to diffuse light impacts the amount and quality of daylight. [1] "Direct sunlight" reaches a site without being scattered within Earth's atmosphere. Sunlight that is scattered in the atmosphere is "diffused daylight". Sunlight reflected off walls and the ground also contributes to ...
When a lightning discharge occurs within a cloud at night, the entire cloud appears to illuminate. In daylight these intracloud flashes are rarely visible to the human eye; nevertheless, optical sensors can detect them. In early missions, astronauts used optical sensors to detect lightning in bright, sunlit clouds far below.
Daylight saving time ends on Nov. 3. Here's how "falling back" affects your health — and how to cope. ... If natural sunlight isn’t an option, try light therapy or a sun lamp, which can ...
Non-linear Sun sensor used by the TET-1 German microsatellite.. A Sun sensor is a navigational instrument used by spacecraft to detect the position of the Sun. [1] [2] Sun sensors are used for attitude control, solar array pointing, gyro updating, and fail-safe recovery.
The detecting range of a photoelectric sensor is its "field of view", or the maximum distance from which the sensor can retrieve information, minus the minimum distance. A minimum detectable object is the smallest object the sensor can detect. More accurate sensors can often have minimum detectable objects of minuscule size.
How much daylight will Pennsylvanians get back after the winter solstice?
Daylight is the combination of all direct and indirect sunlight during the daytime. This includes direct sunlight, diffuse sky radiation, and (often) both of these reflected by Earth and terrestrial objects, like landforms and buildings. Sunlight scattered or reflected by astronomical objects is generally not considered
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