cause the sun. This determines the time of the fulfilment of this "threatening". See Isaiah 13:10; Isaiah 59:9; Isaiah 59:10; Jeremiah 15:5.Joel 2:2; Joel 3:15.Micah 3:6. Can this refer to the earthquake of Amos 1:1.
Related Commentaries of Amos 8:9
Amos 8:9
9 And it shall come to pass in that day, saith the Lord GOD, that I will cause the sun to go down at noon, and I will darken the earth in the clear day: