Could the constellation of the Southern Cross (declination around -60 °) be observed in the northern sky? If so, in what areas on Earth?

Yes maybe. To the north of the zenith, all celestial bodies pass the point of the upper culmination, the declination of which is greater (to the north) of the latitude of the observation point. Therefore, to the south of the parallel 60 ° S lat. the constellation of the Southern Cross will pass the upper culmination point high above the horizon to the north of the zenith.

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