Astrology (like everything) is a cycle, and Aquarius follows Capricorn in the wheel. After CAPRICORN reaches the mountaintop to commune with God, she returns as AQUARIUS to share that knowledge with the community.
KNOWLEDGE = FREEDOM
Freedom to be yourself and follow your own instincts, even when they clash with society's norms. (Those norms will likely be super outdated in a hundred years anyway.)
We're entering the Age of Aquarius now, and experiencing massive shifts in consciousness as more people wake up to their own truth. (Which in my opinion is that ultimately we're all ONE, a very Aquarian ideal.)