Shadow
978-613-4-23736-9
6134237361
212
2011-01-22
59.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 hights, the length 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 planets of Mercury and Venus. A shadow is obstructed 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.
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Physics, astronomy
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