Tafsiran Mazmur 19:5: Rashi & Radak

Their line goes forth throughout the earth The line of the heavens, which are stretched out over the face of the entire earth, and because of which their words are at the end of the world, for all speak of the wonders they see.

Their line is gone out through all the earth: – Their line, i.e. (the line) of their construction; and so (in the verse) “line upon line” (Is. 28:10), because the structure is made by stretching out the line. He means that the work of the spheres and constellations has gone out into all the earth. And so

for the sun He made [i.e.,] the Holy One, blessed be He.

a tent therein In the heavens. From here it is derived that the sun is placed within its case. Tanchuma.