IAU Circular was created in 1920.
The Circular Ruins was created in 1940.
Circular Congregational Church was created in 1681.
Pollen Analysis Circular was created in 1943.
Circular Quay railway station was created in 1956.
Circular Head Christian School was created in 1985.
IAU decided this because it shrinks every 10 seconds
1919
Thursday is Dydd Iau in Welsh i no because I'm welsh
How many constellations have been formally named by the IAU and lies in which hemisphere
IAU stands for the International Astronomical Union, an organization that is responsible for promoting and coordinating the international collaboration in astronomical research. It is also responsible for assigning official names to celestial bodies and features.
It stands for International Astronomical Union.
You've essentially just asked "is there a known planet no one knows about". The answer should be self-evident. The chances that the IAU could keep a planet a secret from everyone else are, essentially, zero.