Once again, this is almost word for word from 2 Kings, chapter 20. However it seems to be in the wrong place. This was better off earlier in this chapter when they were talking about the sign of the sundial since this section ends with King Hezekiah asking for a sign about when he should go to the house of Yahweh. He wanted to know how he would know that he was healed. Isaiah has healed King Hezekiah by taking a lump of figs and putting it on the boil.
This passage seems out of place here, since the healing of King Hezekiah is at the end of this chapter. This backwards moving of the sundial is the sign that Isaiah was to give to King Hezekiah. Instead of Isaiah crying out, this is an abbreviated version of what appeared to 2 Kings, chapter 20, with just the simple statement of Isaiah. This sundial had been installed by King Hezekiah’s father, King Ahaz (736-716 BCE). Since moving forward would not be difficult and was normal. However, if the shadow moved backward, that would be a strange. Thus the sundial moved back 10 intervals, indicating that the sun had moved backwards, which would have been miraculous. If they only knew that the earth was moving and not the sun, they would have been even more astonished.