The way of the heathen. "Way" equivalent to "religion" (comp. ὁδὸς, Acts 9:2, etc.). Be not dismayed at the signs of heaven; alluding to the astrological calculations based upon extraordinary appearances in the sky.
Diodorus Siculus remarks 2.30)—and his statement is fully confirmed by the Babylonian cuneiform tablets—that "the appearance of comets, eclipses of the sun and moon, earthquakes, and in fact every kind of change occasioned by the atmosphere, whether good or bad, both to nations and to kings and private individuals [were omens of future events]."
A catalogue of the seventy standard astrological tablets is to be found in the third volume of the British Museum collection of inscriptions. Among the items we read, "A collection of twenty-five tablets of the signs of heaven and earth, according to their good presage and their bad;" and again, "Tablets [regarding] the signs of the heaven, along with the star (comet) which has a corona in front and a tail behind; the appearance of the sky," etc.
There can hardly be a doubt that the prophetic writer had such pseudo-science as this in his eye (see Professor Sayce, 'The Astronomy and Astrology of the Baby. Ionians, with translations of the tablets,' ere, in the Transactions of the Society of Biblical Archaeology, 3.
145-339).