The anno domini (AD) dating system started in 525. The concept of zero did not make it to Europe until the 11th century.

No. I copied and pasted that. The definition says 'the Sun'. There was a proposal to classify 'exoplanets' but the IAU never accepted it, and so those large masses orbiting other stars remain undefined.

Exoplanets are addressed in a 2003 position statement issued by a now-defunct IAU Working Group on Extrasolar Planets. However, this position statement was never proposed as an official IAU resolution and was never voted on by IAU members.

The stupidest consequence of the definition is not the classification of Pluto, but that there are only eight planets in the entire universe.

a planet is a celestial body that:

1. is in orbit around the Sun

https://en.wikipedia.org/wiki/Steamboat_Willie#/media/File:Steamboat_Willie_1928_Poster.png

$35 for 1GB RAM. 4 and 8 GB v4 are $55 and $75.