And yet there is still zero empirical evidence that your zodiac sign, birth month, or whatever is linked to behavior at all.
All evidence is to the contrary. Literally all of it. So it doesn’t matter what Carl Sagan, according to you, thought about it. Because there is no evidence.
To be honest, even terms like 'empirical evidence' are shit that has been drilled into us via scientific dogma, and the grossly materialistic and reductionist culture we live in. If you are able to switch your 'logical' brain off and use intuition and take it back to first principles - you will find that we as humans actually know very very little about the mystery of how our lives really work and what happens after death - or even about how the material world really works. Science completely breaks down at the quantum level and has literally no clue and no logical answers as all scientific 'logic' breaks down at that level (in fact, science is based off core assumptions that themselves cannot be proved empirically) - and we still worship Science and Logic as our new Gods as that's the conditioning we have been subjected to all our lives. Even Einstein realised that logic and intellect should be a slave to intuition, but we have it completely backwards. In my personal experience, I was never into astrology or believed in it - but have recently kept an open mind and I have to say, I have been absolutely mind blown by the accuracy once I delved deeper into it.
Worth keeping in mind - you have to really study it as it is a ridiculously deep and ancient subject, not this 'what's your sign' bullshit which is not even skimming the surface and makes it look like something out of a gossip column. If you actually look into history, subjects such as astrology and all esoteric arts were purposely pushed underground by the Catholic Church because they gave people too much agency/power and provided a tiny peep into the workings of the Divine/Cosmic intelligence, and these terrified the folks in charge, as then the Church would not be able to hold onto power as an institution and individuals would have a direct link with the wider mystery from which we arise and go back into.
And nobody who has seriously studied Astrology (either Western or Vedic Astrology) and put considerable time into it - would ever doubt its innate truth. Because it is literally mind-blowingly accurate and shows us we are linked to nature and everything around us in ways we cannot imagine - and makes you think how little we know about anything, and what an arrogant culture of ants we really are compared to the cosmic intelligence out there.
Anyhow, my two cents - think for yourself, and don't drink the cultural kool-aid of the last couple of hundred years - if you actually peel the layers back you will find our 'modern scientific world' is only advanced in material ways, but completely backwards in anything to do with spirituality or the 'unseen'. And not to mention, has left most people miserable and completely devoid of meaning in their lives. Most of us are living in the matrix, and we don't even realise it.