We are in the northern hemisphere and observe the rise of star A with a declination of -8 °, and at the same time star B with a declination of + 16 ° enters. Which will happen first: the closest set of star A or rising of star B?
At the moment of rising of star A, a point with declination of + 8 ° sets in the opposite region of the sky, which rises simultaneously with setting of star A. Star B sets simultaneously with this point, but having a greater declination, it will spend less time under the horizon in the northern hemisphere, and will rise earlier , that is, before star A.
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