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Other usesA shadow is an area where direct light from a light source cannot reach due to obstruction by an object. It occupies all of the space behind an Opacity (optics)|opaque object with light in front of it. The cross section (geometry)|cross section of a shadow is a two- dimension al silhouette , or reverse Projection (linear algebra)|projection of the object blocking the light. The sun causes many objects to have shadows and at certain times of the day, when the sun is at certain heights, the lengths of shadows change.
An astronomical object casts human-visible shadows when its apparent magnitude is equal or lower than & minus;4. http://www.gsfc.nasa.gov/scienceques2005/20060406.htm NASA Science Question of the Week, April 7, 2006 Currently the only astronomical objects able to produce visible shadows on Earth are the sun , the moon and, in the right conditions, the planet Venus .
Variation with time
Shadow length when caused by the sun changes dramatically throughout the day. The length of a shadow cast on the ground is proportional to the Trigonometric functions#Reciprocal functions|cotangent of the sun's Altitude (astronomy)#Elevation angle|elevation angle —its angle ? relative to the horizon. Near sunrise and sunset, when ? = 0° and cot(?) is infinite, shadows can be extremely long. If the sun passes directly overhead, then ? = 90°, cot(?)=0, and shadows are cast directly underneath objects.
Non-point
For a non- point source of light, the shadow is divided into the Umbra|umbra and penumbra . The wider the light source, the more blurred the shadow. If two penumbras overlap, the shadows appear to attract and merge. This is known as the Shadow Blister Effect .
If there are multiple light sources there are multiple shadows, with overlapping parts darker, or a combination of colors. For a person or object touching the surface, like a person standing on the ground, or a pole in the ground, these converge at the point of touch.
Shadow propagation speed
The farther the distance from the object blocking the light to the surface of projection, the larger the silhouette (they are considered Proportionality (mathematics)|proportional ). Also, if the object is moving, the shadow cast by the object will project an image with dimensions (length) expanding proportionally faster than the object's own rate of movement. The increase of size and movement is also true if the distance between the object of interference and the light source are closer. This, however, does not mean the shadow may move faster than light, even when projected at vast distances, such as light year s. The loss of light, which projects the shadow, will move towards the surface of projection at light speed .
In photography
In photography, which is essentially recording patterns of light, shade, and colour, "highlights" and "shadows" are the brightest and darkest parts of a scene or image. Photographic exposure must be adjusted (unless special effects are wanted) to allow the Photographic film|film or sensor , which has limited dynamic range , to record detail in the highlights without them being washed out, and in the shadows without their becoming undifferentiated black areas.
Fog shadows
Fog shadows look odd since humans are not used to seeing shadows in three dimensions. The thin fog is just dense enough to be illuminated by the light that passes through the gaps in a structure or in a tree. As a result, the path of an object shadow through the "fog" appears darkened. In a sense, these shadow lanes are similar to crepuscular rays , which are caused by cloud shadows, but here, they are caused by the shadows of solid objects.
Other notes
A shadow cast by the Earth on the Moon is a lunar eclipse . Conversely, a shadow cast by the Moon on the Earth is a solar eclipse .
On satellite imagery and aerial photograph s, taken vertically, tall buildings can be recognized as such by their long shadows (if the photographs are not taken in the tropics around noon), while these also show more of the shape of these buildings.
A shadow shows, apart from distortion, the same image as the silhouette when looking at the object from the sun-side, hence the mirror image of the silhouette seen from the other side (see picture).
Shadow as a term is often used for any occlusion, not just those with respect to light. For example, a rain shadow is a dry area, which, with respect to the prevailing wind direction, is beyond a mountain range ; the range is "blocking" water from crossing the area. An acoustic shadow can be created by terrain as well that will leave spots that can't easily hear sounds from a distance.
Sciophobia, or sciaphobia, is the fear of shadows.
Mythological connotations
main|GhostAn unattended shadow or ghost|shade was thought by some cultures to be similar to that of a ghost.
It is also believed as an alternative construct that shadows are in fact a representation of God's presence around an object; like a Halo (religious iconography)|halo . Early eastern beliefs also play to this theory.
Heraldry
In heraldry , when a charge is supposedly shown in shadow (the appearance is of the charge merely being outlined in a neutral tint rather than being of one or more tincture (heraldry)|tincture s different from the field on which it is placed), it is called umbra-ted . Supposedly only a limited number of specific charges can be so depicted. Shadows can be colored by a colored transparent source of the shadow.
In popular culture
Speculative fiction occasionally features entities somehow made of shadow. Such beings are almost invariably evil.
See also
commons|Shadow
Black drop effect
Convolution#Applications|Convolution applications , for more physical and mathematical discussion about shadows
Gnomon
Shade
Shadow Cabinet
Shadow mapping , in computer 3D graphics
Shadow people
Shadow play
References
reflist|small
External links
http://www.life.com/image/first/in-gallery/40702/seeing-shadows Seeing Shadows - slideshow by Life magazine
