Seasons are caused buy the tilt of the Earth's axis, and the rotation of the Earth around the Sun. There's only one hemisphere at a time that can point towards the sun. The one that's pointing towards gets summer and the one that's pointing away gets winter.
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No, the sun's rays do not shine equally on the northern and southern hemispheres. The angle of the sunlight varies based on the Earth's tilt, causing differences in sunlight intensity and duration between the two hemispheres. This is why we have seasons.
The northern and southern Hemispheres each consist of a range of 90 degrees of latitude. They meet at the equator ... it's the boundary between them. There's no gap between them at the equator, so if you wanted to, you could go to the equator and stand with one foot in each hemisphere. Each hemisphere is shaped like ... like ... like a hemisphere. That's like half of a grapefruit. Their edges fit together to make a complete sphere, and the distance between them at their edges, as well as the angle between them, is zero.
The sun rises in the east, same as in the northern hemisphere. The sun rising is a function of the planet's rotation, which is the same universally. The difference in seasons between the northern and southern hemispheres is a function of the Earth's tilt, and the changes in what areas face the sun more strongly depending on what point the Earth is in it's orbit around the sun.
The Matterhorn is located in the northern hemisphere in the Swiss Alps. It straddles the border between Switzerland and Italy.
Ophiuchus constellation can be best seen at different times of the year in both the northern and southern hemispheres. In the northern hemisphere, it is best observed in the summer months, while in the southern hemisphere, it is most visible during the winter months. Ophiuchus can be located along the celestial equator between the constellations of Scorpius and Sagittarius.