See the entire entry for ˀyt vb./adv. there is, exists

Dan3:15 :בְעִדָּנָא דִּי־תִשְמְעוּן קָל קַרְנָא : at the moment that you hear the sound of the horn

See the entire entry for ˁeddān, ˁeddānā n.m. set time

Dan3:15 :הֵן אִיתֵיכוֹן עֲתִידִין דִּי בְעִדָּנָא דִּי־תִשְמְעוּן קָל קַרְנָא ٠٠٠ תִּפְּלוּן וְתִסְגְּדוּן : if you are prepared to fall down and prostrate yourselves when you hear the sound of the horn … †

See the entire entry for ˁṯīḏ/ˁattīḏ adj. prepared, future