Signs of heaven - Extraordinary appearances, such as eclipses, comets, and the like, which seemed to the pagan to portend national calamities. To attribute importance to them is to walk in pagan ways.
Related Commentaries of Jeremiah 10:2
Jeremiah 10:2
2 Thus saith the LORD, Learn not the way of the heathen, and be not dismayed at the signs of heaven; for the heathen are dismayed at them.