Sergii Tsololo/Alamy
CYGNUS the swan is a beautiful constellation filled with plenty of interesting stars and deep-sky objects. It is visible this time of year almost anywhere in the world: in the northern hemisphere it sits high overhead throughout the night, while in the southern hemisphere it appears lower in the sky, towards the north, as soon as it gets dark, and sets a few hours later.
To find Cygnus, you can use a pattern of stars, or asterism, called the summer triangle, so named because it is directly overhead in the northern hemisphere during summer. In the northern hemisphere, look …
