Valmiki Ramayana Ayodhya Kanda Sarga 63 Shloka 15

रविः Sun, भौमान् relating to the earth, रसान् juices, उपास्य sucking, जगत् world, अंशुभिः by the rays, तप्त्वा च scorching, परेता चरिताम् ranged by departed souls, भीमाम् fearful, दिशम् quarter, आविशते enter sattained.

Having sucked the waters of the earth and scorching the world with its rays, the Sun had entered the frightful southern quarter ranged by departed souls.