Here's why:
* Earth's Orbit: The Earth's orbit around the Sun is slightly elliptical, meaning the distance between the Earth and Sun varies throughout the year. However, this variation is relatively small compared to the vast distance between the Earth and Sun.
* Sun's Size: The Sun is incredibly large compared to Earth, so the slight changes in distance due to Earth's elliptical orbit have a negligible effect on the Sun's apparent size.
While there are minor fluctuations in the Sun's apparent size due to Earth's elliptical orbit, these are not noticeable to the naked eye and are insignificant over a period of several years.