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by kakskee on February 1st, 2010
A long time ago there was an 'on' switch which the sun would trip as it rose above the horizon and an 'off' switch that would trip when the sun was setting but now the sun stays 'on' all the time so that is why you can see it approaching before it rises above the horizon and see it fade away as it falls below the horizon.
by cloudman on February 1st, 2010
The previous respondent is correct about scattered light. Light is also refracted and reflected - more sometimes than at others. I won't bore you with the specifics of the variables. I thought you might be interested to know that if there were no atmosphere, then the sunrise and sunset events would be quite different - as the astronauts orbiting the moon experienced them - very quick - little warning.
by Anonymous on February 1st, 2010
Because the air scatters light. There's lots of dust particles up there, especially during the evening after the winds of the day. That's why sunsets are redder than sunrises.
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