How do we measure the length of a year?

The video tutorial explains the variation in day and night lengths throughout the year, focusing on the Vernal Equinox as a key point for calculations. It describes the tropical year and how the Equinox is defined by the sun crossing the celestial equator. Historical context is provided with references to ancient astronomers. The Earth's tilt and precession are discussed, highlighting their impact on the movement of constellations and the definition of a year. The tutorial concludes by linking these concepts to the consistency of seasons, which is crucial for agriculture.

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