How do we measure the length of a year?

The video begins with New Year wishes from the creator, who is from New Zealand. It then raises the question of how to measure the length of a year, presenting several methods such as using the Earth's movement around the sun, the time between equinoxes or solstices, or the phases of the moon. Viewers are invited to choose a method to learn more about it through interactive links.

What new insight or understanding did you gain from this video?