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Redshift is an application that adjusts the computer display's color temperature based upon the time of day. The program is free software and is intended to reduce eye strain, as well as insomnia [3] (see Sleep § Circadian clock and Phase response curve § Light).
A screen in F.lux's "darkroom mode" On installation, the user can choose a location based on geographic coordinates, a ZIP code, or the name of a location.The program then automatically calibrates the device display's color temperature to account for time of day, based on sunrise and sunset at the chosen location.
While apparent magnitude is a measure of the brightness of an object as seen by a particular observer, absolute magnitude is a measure of the intrinsic brightness of an object. Flux decreases with distance according to an inverse-square law , so the apparent magnitude of a star depends on both its absolute brightness and its distance (and any ...
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Apparent magnitude, the brightness of an object as it appears in the night sky. Absolute magnitude, which measures the luminosity of an object (or reflected light for non-luminous objects like asteroids ); it is the object's apparent magnitude as seen from a specific distance, conventionally 10 parsecs (32.6 light years ).
A common dual dimmer module used in stage lighting A dimmer. A dimmer is a device connected to a light fixture and used to lower the brightness of the light.By changing the voltage waveform applied to the lamp, it is possible to lower the intensity of the light output.
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Because Solar System bodies are illuminated by the Sun, their brightness varies as a function of illumination conditions, described by the phase angle. This relationship is referred to as the phase curve. The absolute magnitude is the brightness at phase angle zero, an arrangement known as opposition, from a distance of one AU.