How was Saule believed to travel across the sky?

In Baltic mythology, Saule is believed to travel across the sky daily in a chariot featuring copper wheels. This chariot is pulled by horses that are described as tireless, never sweating, and requiring no rest.12

As she completes her journey, she reaches the end of the sea, where she washes her horses while sitting atop a hill and holding golden reins. She then passes through silver gates to enter her castle. During the night, it is believed that Saule travels back from west to east beneath the earth, allowing her to begin her course anew over the sky—which is often envisioned as a mountain—the following morning.12