Does sky affected by gravitational blueshift?

Yes, the sky can be affected by gravitational blueshift, which occurs when light moves away from a massive object, such as a planet or star, and experiences an increase in frequency as it climbs out of the gravitational well. This phenomenon is more noticeable in astrophysical contexts, such as near massive celestial bodies. However, in everyday observations from Earth's surface, gravitational blueshift is negligible and not typically perceived.