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Compute the colour in the AB photometric system

I have a question for homework and don't get it at all: Consider two filters as shown in the figure below. Compute the colour S1 - S2 in the AB system for a star with flux: where is a constant ...
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golden and red colored light even after Sunset [closed]

I heard about golden hour but today i saw golden and red colored patches in sky even after Sunset. why it happens? and would like to know more about science behind golden hour.