Rav Sadya Gaon: The sun rises and sets ¹ and does not cease to rise to the place from which it shined.

Rashi: Just like the sun rises in the morning and sets at night, and goes [under the Eretz] the entire night, it yearns to return to the place that it rose yesterday, to rise there again today.

Ibn Ezra: Even though the sun moves, rises and sets, it returns to its place like initially. Where it shines today is close to where it shines tomorrow. Due to its movement to north and south, at each place it shines twice annually, and once each at the northern and southern extremes. The same applies to the moon and the other five Kochvei Leket. The verse mentions only the sun, which is the biggest, just like "la'Shemesh Sam Ohel Bahem" (Tehilim 19:5) omits the stars.

Ri Kara: Do not say that also the sun is Hevel, for it rises in the morning in the east and sets at night in the west. Where it rose today, it will rise tomorrow.

Rid: It mentions the orbit of the sun and streams going to the sea, for these are a comparison to "Dor Holech

Ibn Ezra: This is like "b'Avas Nafshah Sha'afah Ru'ach" (Yirmeyah 2:24) - as if it inhales Ru'ach amidst great desire to return to its place.

Rashbam: [At night,] it rushes to return to the place where it shined today.

Ri Kara: This is like "k'Eved Yish'af Tzel" (Iyov 7:2) - it longs for its time to rise in its place. Metzudas Tziyon - Sho'ef is looking [towards] and desiring a matter.

R. Avigdor: The sun could rise and set immediately. However, Hashem tells it when to rise, and where.

Metzudas David: When the sun is about to rise, it wants to return to where it was and not shine; the Galgal forces it to shine in its place ¹ .