Jamieson, Fausset and Brown on 2 Kings 23:5

5. put down the idolatrous priests--Hebrew, chemarim, "scorched," that is, Guebres, or fire-worshippers, distinguished by a girdle (Eze 23:14-17) or belt of wool and camel's hair, twisted round the body twice and tied with four knots, which had a symbolic meaning, and made it a supposed defense against evil.

them also that burned incense unto Baal, to the sun, and to the moon, &c.--or Baal-shemesh, for Baal was sometimes considered the sun. This form of false worship was not by images, but pure star-worship, borrowed from the old Assyrians.

and--rather, "even to all the host of heaven."