2 Kings 20:11

The dial of Ahaz] Probably a platform surrounded by steps and surmounted by a pillar, the shadow of which fell upon a smaller or larger number of the steps according as the sun mounted or declined in the sky. It has been conjectured that a slight alteration of the length of the sun's shadow might be produced by a partial eclipse; if so, the sign consisted in the event taking place in agreement with the prophet's prediction.