It is implied that there will be no light from the sun. AT: "there will be no light from the sun" (See: [[rc://en/ta/man/translate/figs-explicit]])
# a day known only to Yahweh
This can be stated in active form. AT: "only Yahweh knows when that day will begin" or "only Yahweh knows when that time will begin" (See: [[rc://en/ta/man/translate/figs-activepassive]])