Jamieson, Fausset and Brown on Isaiah 47:13

13. wearied--(compare Is 57:10; Eze 24:12).

astrologers--literally, those who form combinations of the heavens; who watch conjunctions and oppositions of the stars. "Casters of the configurations of the sky" [Horsley]. Gesenius explains it: the dividers of the heavens. In casting a nativity they observed four signs:--the horoscope, or sign which arose at the time one was born; the mid-heaven; the sign opposite the horoscope towards the west; and the hypogee.

monthly prognosticators--those who at each new moon profess to tell thereby what is about to happen. Join, not as English Version, "save ... from those things," &c.; but, "They that at new moons make known from (by means of) them the things that shall come upon thee" [Maurer].