Soon a small cloud of the stuff covered her side.

The clouds had covered the sun completely now, at least to human eyes.

A black cloud covered the sun; the earth grew dark.

Big clouds now covered the stars and there was no light at all to see by.

Her vision was dark as if clouds had covered the sun.

The clouds had covered the moon and it was now quite dark.

It was all he had, with clouds covering the stars.

The night was dark, clouds covering the light of the moon.

A cloud covered the sun and he shivered with cold.

Why couldn't there have been heavy dark cloud covering the entire sky?