2 Kings 20

"“Return and tell Hezekiah the leader of My people, ‘Thus says the Lord, the God of David your father: “I have heard your prayer, I have seen your tears; surely I will heal you. On the third day you shall go up to the house of the Lord.  And I will add to your days fifteen years...So Isaiah the prophet cried out to the Lord, and He brought the shadow ten degrees backward, by which it had gone down on the sundial of Ahaz."  vv.5-6,11

Read chapter 20
A pretty interesting chapter in the life of Hezekiah here.  First we see him about to die and then the Lord hears his prayer and adds 15 years of life to him.  Then the sign that this would be true is causing the shadow of the sun to go backwards ten degrees.  As we look at the first miracle of fifteen added years of life we must think more deeply about this.  Hezekiah was a good king doing right in the eyes of the Lord, so if the "typical" view of you go to heaven when you die is true then why wouldn't Hezekiah be happy and ready to depart and go there?  Perhaps this view of heaven when you die isn't exactly true...
But even if so, what a sweet gift and answer to prayer to have fifteen years of added life.  If you knew you had 15 years of life to live, how would you spend it?
How the shadow was brought backwards ten degrees we do not know.  By the shadow moving backwards it gave more time in the day just as God had just given more years of life to Hezekiah.  It seems to just have been in the land than across the whole world from 2 Chron. 32:31, "the ambassadors of the princes of Babylon, whom they sent to him to inquire about the wonder that was done in the land."  Oh how I often ask for signs like this in answer to prayer request I have.  How do you see, feel, understand the sign of the Lord's response to prayer?