מִקְצֵ֤ה הַשָּׁמַ֨יִם ׀ מֽוֹצָא֗וֹ וּתְקוּפָת֥וֹ עַל־קְצוֹתָ֑ם וְאֵ֥ין נִ֝סְתָּ֗ר מֵֽחַמָּתוֹ׃
Von dem einen Ende des Himmels ist sein Anfang, und sein Kreislauf ist über dessen anderem Ende, nichts ist verhüllt seiner Glut. —
Rashi on Psalms
and its circuit is to their ends The circuit of its orbit is from one end to the other.
Radak on Psalms
His going forth is from the end of the heaven – i.e. from the east:
Rashi on Psalms
and none is hidden from its heat Had the sun been placed in the lowest sky, no man would be able to hide from its heat (Mid. Ps. 18:13) for the sun and the moon are in the second sky, as is stated (in Hagigah 12b): There are seven skies—Vilon, Rakia, Shehakim, Zevul, Machon, Ma’on, Aravothand he counts them in order: Vilon does not serve for anything; in Rakia are the sun, the moon, the stars, and the planets, etc.