How do we measure the length of a year?

The video tutorial explains the concept of orbital speed, particularly focusing on the speed of objects when they are closest to each other, known as perihelion. It discusses how the apparent motion of the sun is fastest at this point, making it easier to measure the length of a year. The tutorial introduces the concept of the anomalistic year, which is slightly longer due to gravitational effects from other celestial bodies. The video concludes with a brief reflection and New Year wishes.

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