The Seasons, the Equinoxes, and the Slow Wobble That Ancient Astronomers Tracked for Millennia

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Earth's axis sits at a tilt of 23.5 degrees relative to the plane of its orbit around the sun. That tilt is what gives us the seasons - the northern hemisphere leaning toward the sun in summer, away from it in winter, with the equinoxes marking the two moments each year when day and night are of equal length worldwide.
What most people do not know is that the direction the axis points is not fixed. It traces a slow circular wobble - precession - completing one full cycle every approximately 26,000 years. Today the axis points toward Polaris, the North Star. Half a precessional cycle ago, roughly 13,000 years in the past, it pointed toward Vega instead. Vega was the North Star then. In another 13,000 years it will be again. The ancient astronomers who tracked this cycle were working with one of the most fundamental and long-period rhythms in Earth's relationship with the cosmos.

Видео The Seasons, the Equinoxes, and the Slow Wobble That Ancient Astronomers Tracked for Millennia канала The Randall Carlson