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The definition of the term was originally derived from its primary scientific meaning, which is "a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light". [10] By analogy, rights that exist in the constitution's penumbra can be found in the "shadows" of other portions of the constitution. [13]
An observer in the penumbra experiences a partial eclipse. An alternative definition is that the penumbra is the region where some or all of the light source is obscured (i.e., the umbra is a subset of the penumbra). For example, NASA's Navigation and Ancillary Information Facility defines that a body in the umbra is also within the penumbra. [2]
What is the penumbra during an eclipse. The second shadow is called the penumbra. According to timeanddate.com, the penumbra is the lighter outer part of the moon’s shadow. It is the portion of ...
Umbra, penumbra and antumbra. A point source of light casts only a simple shadow, called an "umbra". For a non-point or "extended" source of light, the shadow is divided into the umbra, penumbra, and antumbra. The wider the light source, the more blurred the shadow becomes. If two penumbras overlap, the shadows appear to attract and merge.
The problem of the penumbra arises when the definition of a word in a law is inadequate in deciding the outcome of a case, leading to human interpretation of the law as the deciding factor. An example is a law that refers to a vehicle, which would clearly mean automobile in a core case, but in the penumbra case, the vehicle in question is an ...
A total eclipse occurs when the observer is within the umbra, an annular eclipse when the observer is within the antumbra, and a partial eclipse when the observer is within the penumbra. During a lunar eclipse only the umbra and penumbra are applicable, because the antumbra of the Sun-Earth system lies far beyond the Moon.
Such compartmentalized clearances may be expressed as "John has a TS/SCI", whereby all clearance descriptors are spelled out verbally. For example, the US National Security Agency once used specialized terms such as "Umbra", [27] [28] [29] This classification is reported to be a compartment within the "Special Intelligence" compartment of SCI. [30]
One part of its shadow is called the penumbra. The penumbra is the region where the light from the source is partly blocked; it runs from full light at one side to full shadow at the other. Another part of the shadow is called the umbra. The umbra is the region where the light is completely blocked.