Valmiki Ramayana Sundara Kanda Sarga 19 Shloka 9
Original Shlokaवेष्टमानां तथाऽविष्टां पन्नगेन्द्रवधूमिव। धूप्यमानां ग्रहेणेव रोहिणीं धूमकेतुना।।5.19.9।।
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तथा in that way, आविष्टाम् sitting, वेष्टमानाम् coiled around, पन्नगेन्द्रवधूमिव like the queen of serpents, धूमकेतुना by comet, ग्रहेण by the planet, धूप्यमानाम् smoking, रोहिणीमिव like Rohini.
Sitting in that manner she resembled a coiled serpent queen, the star Rohini overshadowed by a smoking comet (that is Ravana).