What is solar year?

Explanation

**Step-by-Step Solution:**

1. **Definition of Solar Year**: A solar year is defined as the time taken by the Earth to complete one full revolution around the Sun. This period is significant in the context of our calendar and seasonal changes.

2. **Duration of a Solar Year**: The duration of a solar year is approximately 365.25 days. This means that it takes about 365 days and an additional quarter of a day for the Earth to orbit the Sun completely.

3. **Adjustment for Leap Years**: To account for the extra 0.25 days each year, we introduce a leap year every four years. In a leap year, February has 29 days instead of 28, which helps to keep our calendar year synchronized with the solar year.

...