Why is Scorpius visible during summer in the northern hemisphere but visible during winter in the southern hemisphere?
When it is summer in the northern hemisphere, it is winter in the southern hemisphere. Thus it is visible at the same time in both hemispheres.
Scorpius is visible in the night sky during summer in the Northern Hemisphere. Sagittarius is visible in the night sky during summer in the Northern Hemisphere. Cygnus is visible in the night sky during late summer/early autumn in the Northern Hemisphere. During the Southern Hemisphere winter, when the South Pole of the Earth is pointed away from the Sun, the Earth is positioned between the constellation of Scorpius and the Sun. This is why Scorpius can be seen in our night sky during winter evenings. Orion is visible on winter evenings in the northern hemisphere but not on summer evenings because of the position of the Earth around the Sun. The constellations located close to the North or South Celestial Pole can only be seen from their respective Hemisphere. Other constellations can be spotted from both Hemispheres, although their exact orientation and how high they appear in the sky depends on the observer's latitude. The stars appear each night to move slightly west of where they were the night before. Your location on Earth also determines what stars and constellations you see, and how high they appear to rise in the sky. The Northern Hemisphere is always pointing in a different direction than the Southern Hemisphere. If you are in the Northern Hemisphere, you can see Ursa Major all year. This constellation is circumpolar, meaning that over the course of the night, it travels in a circle around the North Star and never sets. During the Southern Hemisphere winter, when the South Pole of the Earth is pointed away from the Sun, the Earth is positioned between the constellation of Scorpius and the Sun. This is why Scorpius can be seen in our night sky during winter evenings. Scorpius can be seen from May through August, mostly in the Southern Hemisphere. In the Northern Hemisphere it appears low in the sky for people living south of latitude 40°. The best time to see the constellation is at about 9:00 in the evening in mid-July. Constellations near the Celestial Equator and the ecliptic are visible from both hemispheres. The International Astronomical Union recognizes 88 constellations covering the entire northern and southern sky. Here is a selection of the most familiar and easily seen constellations in the northern sky. While the north pole faces outwards to the Universe beyond, the south pole points to the galactic centre of the Milky Way. This means more bright stars and more constellations containing more stunning objects. Plus, everything in the southern hemisphere sky will look upside down, if you're used to northern skies.
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