IAU designated constellations

Star Patterns in the Sky

The International Astronomical Union (IAU) chose 88 special areas in the sky. These areas are called constellations. They help us find stars and other objects, just like naming parts of a map.

Many of these star patterns have very old stories. People from Mesopotamia and Greece made most of the northern ones a long time ago. The astronomer Ptolemy wrote about many of them.

When explorers found new stars in the southern sky, European astronomers added more patterns. All the constellations have names in Latin, a language from ancient Rome. This helps everyone talk about the same stars.

In 1922, the IAU gave each constellation a short three-letter name. This makes it easy for scientists to share information without confusing each other.

Some Famous Constellations

Here are a few of the 88 constellations and what they look like:

• Andromeda: Named after a character from old stories.
• Aquarius: Looks like a water bearer.
• Eagle: Shaped like a flying eagle.
• Orion: One of the brightest and easiest to find. It looks like a hunter.
• Ursa Major: Also called the Big Bear. It includes the Big Dipper.

Fun Star Groups

Besides the official constellations, there are many informal groups of stars called asterisms. These are not official, but people love to see them. Some well-known asterisms are:

• The Big Dipper in Ursa Major
• The Teapot in Sagittarius
• The Square of Pegasus in Pegasus and Andromeda

These star patterns make the night sky full of wonderful things to explore!