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The culmination of the luminaries – These phenomena are called the culmination of the luminaries or the highest point.
The combination of a luminary with the celestial meridian in the southern part of the sky, where it occupies the highest position above the horizon, is called the upper culmination. The alternating intersection of the celestial meridian, illuminated by non-setting stars, in the northern part of the sky is called the lower culmination. For the northern hemisphere of the Earth, everything said is true. The southern hemisphere is different in that the upper culmination is in the northern part of the sky, and the lower in the southern.
