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Overview         (For age - group : Above 16 )

Without knowing it most of us stay up longer because the day is .... longer than what it is supposed to be, blame it on the phenomenon of atmospheric refraction and angle of the Sun. This animated physics topic gives in-depth information to high school and college students about how atmospheric refraction works.

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Category : Science > Physics

Product Type : Animation

Longer day than actual : This animation contains the following

Does the sun rises earlier or sets later than it seems ?

Explanatory Notes section contains :

What is refraction ?
Why density of air is maximum at earth's surface and decreases as we go higher?

sun rises earlier than its actual time Sun sets later than its actual time
Sun rises earlier than its actual time
Sun sets later than its actual time
atmospheric refraction 1
atmospheric refraction 2
This is due to the phenomenon of atmospheric refraction that we have a longer than actual
Details of the animation/ movie /software

This is a natural phenomena due to atmospheric refraction.
On the earth's surface, density of air is maximum, and as we go higher, the density of air becomes Lesser. The ray from the Sun when enters into the atmosphere of earth travels from Rarer to Denser media and bend towards the normal. But our eye can follow only the straight line path.Thus sun appears to be above the horizon when it is actually below the horizon. So the Sun appears to rise earlier than its actual time.
The same things happen in the time of sunset .So the Sun sets later than its actual time.

As a result of these two phenomena we get more time in a day.

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Q & A
Q1: Correction:Should be rare to denser and not from denser to rarer Naresh 8/12/2007
Ans: Thanks for pointing that out, the correction has been made

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