1)
What is the meaning of "b'Lechtam Yelechu"?
1.
Rashi: When the Chayos go, the Ofanim go.
2.
Malbim: This discusses the second intrinsic movement of the stars, from west to east, and they go north and south. Sometimes this motion stops - "uv'Amdam Ya'amodu." Sometimes they are elevated from the natural order - "uv'Nas'am me'Al ha'Aretz." Then the Ofanim elevate correspondingly. The Chayos conduct the Ofanim like the Nefesh conducts the body.
