1)
What is the significance of the sun and moon darkening?
1.
Refer to 3:4:1:2-3 and the note there.
2.
Malbim: Conduct via Heavenly bodies will cease.
2)
What is the meaning of "Asefu Nagham"?
1.
Rashi: They held back their light.
2.
Malbim: The stars will not act (influence) via the Ma'arachah.