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During sunrise and sunset the distance that the light has to travel from the Sun to an observer is at its greatest. This means the a large amount of blue and violet light has been scattered so the light that is recieved by an observer is mostly of a longer wavelength and therefore appears to be reddish orange.
The same reason applies during sunrise as it does sunset. It is the sun's rays hitting the horizon ant a certain angle the suns' light being red or orange illuminates the horizon.
Red sky a night shepards delight, red sky in the morning shepards warning. This can be due how much dry air and dust is in the atmosphere between you and the sun as where you have a red sun further afield they may see a yellow sun which indicates more moist air. You have seen the sun go down a bright burning yellow rather than a red this moist cold air. Add this to the fact that the sun comes through more atmosphere in the morning and evening thus changing its size and colour.
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