Valmiki Ramayana Ayodhya Kanda Sarga 10 Shloka 11

महायशा: renowned, स: he, निशाकर: moon, पाण्डुराभ्रम् with pale clouds, राहुयुक्तम् accompanied by Rahu, आकाशमिव like the sky, श्रेष्ठम् excellent, कैकेय्या: गृहम् Kaikeyi's abode, प्रविवेश entered.

The illustrious king entered the excellent abode of Kaikeyi like the Moon entering the mouth of Rahu in a sky overcast with pale clouds.