Research summary
How Astronomers Define Constellations
- The IAU defines a constellation as an area of sky with official coordinate boundaries.
- Those areas are unequal in size, unlike the twelve equal 30-degree signs.
- So a constellation and the zodiac sign that shares its name are different things.
Citation
https://www.iau.org/Iau/Science/What-we-do/The-Constellations.aspx
Source overview
The International Astronomical Union defines constellations as areas of sky surrounded by coordinate boundaries. This differs from the equal 30-degree signs used by twelve-sign astrology.
What the source establishes
Why constellations are bounded sky regions rather than equal zodiac signs.
Limitations
The source supports the astronomy or calendar claim described above. It does not validate astrological personality interpretations or predictive claims.
Practical meaning
That way we can cite scientists for what’s measurable in the sky, and still say clearly when we’re describing astrological symbolism.
Editorial note: Astrological meanings on this page describe traditional interpretations. They are not presented as scientifically proven personality facts.