क्रमाद्गगनमध्यस्थाश्चन्द्रमण्डलतां ययुः ।धूमा गगनकोशस्थाः शीतलाम्बुदतामिव
In plain words
Gradually, stationed in the midst of the sky, they came to the state of the moon's disc — as vapours housed within the vault of heaven come to the state of cool clouds.