The ConstellationsSince thousands of years, scientists and philosophers have interpreted the stars in the night sky as mythological figures. This has led to what we now know as constellations. Eventually, every star belongs to one of these 88 constellations. Among them are the well known Great Bear, also known as the Big Dipper, dating back to the ancient Greek. Most constellations in the northern hemisphere date back to the ancient Greek or the ancient Persians.
On the other hand, the constellations in the southern hemisphere are less famous and mostly only a few hundred years old. They were only introduced when adventurers and explorers from Europe started to explore the world a few hundred years ago and set sight on the stars of the southern hemisphere for the first time. Therefore, many constellations of the southern hemisphere have a modern origin, like the Telescope or the Microscope.
Both are scientific instruments not known to the ancient Greek or Persians. The constellations as used by astronoers from all around the world were agreed upon be the International Astronomical Union (IAU) in 1922. 12 of these constellations belong to the zodiac. That means that the sun passes through them over the course of a year.