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Overview         (For age - group : Below 16 )

How does our shadow vary as the sun rises and sets, this is same principle by which our ancestors used to tell time by using "sundial". This science animation (optics) software gives in-depth information about variation of shadows and is very useful for students and teachers.

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Variation of length of a shadow

Category : Science

Type : Animation

Duration : 6 minutes

The software (animation) file contains

Formation of shadow
Variation in Sun's position during the day

The explanatory notes section provided contains
What is a shadow?
Why size of the shadow varies?
Why shape of the shadow resembles the shape of an object?
Why shadow appears darkest when the sun is high in the sky near midday and light or entirely absent during cloudy day?
Can shadow of the tree help us to determine the height of the tree?

Shadow is longest during morning or eveningg
Shadow is longest during morning or evening
Shadow is smallest but darkest at noon
Shadow is smallest but darkest at noon
Details of the animation/ movie /software

Shadows are formed when the sunrays are blocked by objects. Depending upon the relative positions of the light source and the object the length of the shadow keeps varying. In case of Sun, during the daytime the position of the sun in the sky keeps changing and hence the amount of sunlight getting blocked also varies. Consequently, the sunrays blocked by objects vary and hence the length of the shadow also varies. It is observed that the length of a shadow is maximum when the sun is at low altitude during mornings and evenings and is minimum during noon when the sun is overhead.

If you are still unclear about the concepts, please refer the animation.

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Buyers Feedback:

Q & A
Q1: why shadows are tallest at moring and evening SINI S PHILIP 22/1/2010
Q2: how was the altitude of the sun related to the length of the shadow? Gem Lou Geraldino 25/6/2008
Ans: The angle of the sun with respect to horizon determines the length of a shadow, if the Sun is low on the horizon at Sunrise and Sunset the shadow are the longest at noon time when sun is overhead the shadow are the shortest

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