The concept of a "year length of the sun" is not scientifically accurate. The sun itself doesn't have a year length.

Here's why:

* The Earth's Year: A year is defined as the time it takes for the Earth to complete one full orbit around the Sun. This takes approximately 365.24 days.

* The Sun's Rotation: The Sun does rotate on its axis, but this rotation period is different from a year. The Sun's rotation period at the equator is about 25 days. However, the Sun is a gaseous ball, so different parts of the Sun rotate at different speeds.

* Solar Activity Cycles: The Sun also has its own cycles of activity, like sunspot cycles, which last about 11 years. These cycles are related to magnetic field changes in the Sun, not its orbital period.

So, while the Sun is essential for our planet's year, it doesn't have a year length in the same way that the Earth does.