What phenomenon is associated with 'seeing' in astronomy regarding starlight?

Answer

Distortion or twinkling caused by atmospheric turbulence.

Seeing is the measure of air steadiness, describing how much the light from a star is distorted or caused to twinkle by turbulence in the atmosphere.

What phenomenon is associated with 'seeing' in astronomy regarding starlight?

#Videos

Why night skies are better in winter than during summer - YouTube

seasonskyclear