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I read research a long time ago that people who believe in astrology tend to behave more like their star sign. I forgot where I read it though.

Definitely a self-fulfilling prophecy effect.

The birth date effect is actually real: https://en.wikipedia.org/wiki/Relative_age_effect

So maybe machine learning can turn astrology into a real science after all!

Could this be explained by children being older when they're going through school, allowing them to be more able to play successfully in sports / be in the middle of puberty at a more convenient time in the years where they would join a sport?

It can guess your Reddit birthday-based star sign.