The Journey

It takes 26,000 years for our solar system to pass through 13 constellations which we call the zodiac. How do we know? Well the calculations can be done and have been done using observation and extrapolation. But if one clings too tightly to calendars of a more recent creation, such calculations are seen as the stuff of fancy. For if everything is only 6-7000 years old, how can the solar system have been around for 26 millennia? The schools of thought that gave us the 6000 year paradigm also gave us an Earth-centered universe, an immutable sky and a flat Earth. If those people were wrong about those three things how do we know they're right about the age of the Earth? Maybe we know that the solar system takes that long in its travels because we've lived it?