Valmiki Ramayana Kishkindha Kanda Sarga 23 Shloka 18

निष्कृषमाणस्य as it was being pulled out, तस्य of that, बाणस्य arrow's, द्युतिः glow, दिनकरात् Sun's, अस्तमस्तकसंरुद्धः obstructed by the peak of the western mountain, रश्मिः इव like the rays, बभौ appeared.

As the arrrow(drenched in blood) was being pulled out, its glow looked like the Sun's rays obstructed by the peak of the western mountain.