Shadow

A 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 opaque object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or reverse 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 −4. 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.

Read more about ShadowVariation With Time, Non-point Source, Shadow Propagation Speed, Color of Shadow On Earth, In Photography, Fog Shadows, Other Notes, Mythological Connotations, Heraldry

Other articles related to "shadow, shadows":

Culture Of The Ottoman Empire - Performance - Karagöz (shadow Play)
... The Turkish shadow theatre, also known as Karagöz ("Black-Eyed") after one of its main characters, is descended from the Oriental Shadow theatre ...
Shadow Congressperson
... The offices of shadow U.S ... Representative and shadow U.S ... The office originated with the election of the first Shadow Senators in 1796, and the position of Shadow US Representative first appeared in 1956 in the Territory of ...
Stephen Twigg - MP For Liverpool West Derby: 2010-present
... In October 2010 he unsuccessfully contested the election for the Shadow Cabinet, coming in 36th out of the 49 candidates and winning 55 votes ... He was subsequently appointed to the Labour front bench as a shadow minister in the Foreign Affairs team ... On 7 October 2011 he was appointed to the post of Shadow Secretary of State for Education, following the Shadow Cabinet reshuffle ...
Shadow - 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 ... Shadows can be colored by a colored transparent source of the shadow ...
Rolls-Royce Silver Shadow - Overview
... manufacturer's tradition of building luxury vehicles, the standard wheelbase Silver Shadow measured 224 inches (5,700 mm), 4,700 lb (2,100 kg) and had a ... The Silver Shadow was produced from 1965 to 1976, and the Silver Shadow II from 1977 to 1980 ...

Famous quotes containing the word shadow:

    In order to be somebody you have to hold even your shadow in high regard.
    Friedrich Nietzsche (1844–1900)

    before its great shadow joined
    the walls and roof and seemed
    to uphold the hall like a beam.
    Denise Levertov (b. 1923)

    When the shadow of death blots out my joy
    And erases the face of the sun
    Give me strength to endure, hope to believe
    That living and dying are one.
    William L. Wallace (20th century)