Bede : So that they may shine in the firmament of the heaven, and give light upon the earth; and it was so. Indeed, the luminaries always shine in the firmament of the heaven, as we have said, and they flood the nearby regions with bright light, but at appropriate times they give light to the earth. For sometimes the cloudy atmosphere obstructs, so that neither the light of the moon, when it is small, nor the light of the stars appears to the earth; and the rising of the sun, with its greater light, prevents the moon and the stars from illuminating the earth; hence it is named in Latin, because it alone, with the stars and the moon obscured, shines on the earth during the day. — Commentary on Genesis (Hexaemeron)