At times white fluffy clouds blocked its rays, then drifted on.

They also need to consider what they will do if the clouds block the sun.

He chose a rainy night, when clouds blocked all natural skylight.

She glanced up and noticed that a cloud was blocking the sun.

The clouds were thick from the storm, blocking even the moon and stars.

They were gray now, with thickening rain, and dense black clouds blocking the sun.

He looks out his window, but the clouds block the stars.

Sarah was just glad the clouds didn't altogether block the western wall from view.

Puffy white clouds blocked his path as he moved inland.

A cloud blocked the sun and she stopped, not knowing in which direction she faced.