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- This article is about a grouping of stars. For other uses, see Constellation (disambiguation).
The Orion constellation
A constellation (Latin: Sidus; Greek: σχηματισμού) is a regionally existing group of arbitrary assembled celestial objects that represents a figure or object. Constellations are generally defined by their shape patterns made by their grouping of stars.
The International Astronomical Union (IAU) decided to set boundaries for constellations in beginning of the 20th century. Coming to the mid 1930s, they established a list of 88 constellations in account of the IAU Commission 3 through the use of the ancient Greek's narrative Claudius Ptolemy's Almagest.
Constellations are a group of stars that are called a constellation for it's pattern. Seeing constellations differ upon location; being of that some are visible in the northern or southern hemisphere at different times of the year. Inside the solar system, all stars are part of a constellation except the sun.
The history of the discoverance to the recording of constellations all dates back to the 4th century BC, in the ancient Greek era.