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That's like saying Huckleberry Finn doesn't exist. Just because it's made-up doesn't mean it doesn't exist. It exists as a concept which billions of people understand.
I think it is pretty clear in the context of the joke that they weren't saying the concept doesn't exist they were saying the attributes of the concept doesn't exist.
Counterpoint: how can Huckleberry Finn exist if our eyes aren't real?
Nothing is real! I'm the only sentient entity in the universe. Now stop arguing with me, me.
Where we're going we won't need eyes to see.
The Sun's position on the ecliptic at the vernal equinox is not a "concept", it's a physical reality, recognised by the International Astronomical Union.
And the astrology signs exist as a concept as recognized by thousands of years of human history dating back to Babylonia 2 BCE. Yes we understand that they're likely completely bogus, but that doesn't mean that they don't exist.
This thread is so dumb. The signs, and the Sun's progression through them, are as real as anything else in the sky.
Disagree on the semantics. Physical realities are concepts as well. "Energy", despite being an extremely useful physical measurement, is an abstract concept. "Physical realities" and "concepts" are not mutually exclusive nor antonymous words.
In this case, the Aries/vernal point is a concept used to define coordinate systems using physical measures from Earth.
You are technically correct (the best kind of correct), but the meme is funny anyway.