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Lighter Side. Politics
A Winston cone is a non-imaging light collector in the shape of an off-axis parabola of revolution [1] [2] with a reflective inner surface. It concentrates the light passing through a relatively large entrance aperture through a smaller exit aperture. [ 3 ]
In volumetric lighting, the light cone emitted by a light source is modeled as a transparent object and considered as a container of a "volume". As a result, light has the capability to give the effect of passing through an actual three-dimensional aerosol (e.g. fog, dust, smoke, or steam) that is inside its volume, just like in the real world.
If using a system of units where the speed of light in vacuum is defined as exactly 1, for example if space is measured in light-seconds and time is measured in seconds, then, provided the time axis is drawn orthogonally to the spatial axes, as the cone bisects the time and space axes, it will show a slope of 45°, because light travels a ...
Light cone coordinates can also be generalized to curved spacetime in general relativity. Sometimes calculations simplify using light cone coordinates. See Newman–Penrose formalism. Light cone coordinates are sometimes used to describe relativistic collisions, especially if the relative velocity is very close to the speed of light.
All rays now miss the receiver and all light is lost. Therefore, for incidence angles α < θ all light is captured while for incidence angles α > θ all light is lost. The concentrator is then said to have a (half) acceptance angle θ, or a total acceptance angle 2θ (since it accepts light within an angle ±θ to the optical axis).
Liber Resh vel Helios, [1] commonly referred to as Liber Resh, is a set of daily solar adorations composed by Aleister Crowley, the founder of the religion of Thelema. The practice involves a series of invocations to the Sun at specific times of the day: dawn, noon, sunset, and midnight. These rituals are intended to align the practitioner with ...
Blue hour at the Old Cathedral of the Holy Name of Jesus, Bragança in Portugal. The blue hour (from French l'heure bleue; [1] [a] pronounced [lœʁ blø]) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon.