The sign of the sundial was a precursor to the main event: during the the night 185,000 soldiers of the Assyrian army became dead corpses. The Assyrian king fled to Damascus where he was killed by his own children.
Hezekiah Superstar
The Sun Went Backwards
The sun going backwards is such a significant event that it's recorded twice in scripture in 2 Kings 20 and Isaiah 38:8. It's also referred to in 2 Chronicles 32:31 as "the wonder that was done in the land".
September 23rd
Jerusalem was besieged by the Assyrian army and King Hezekiah was sick and nearly died. Then the sun went backwards. The Assyrian army was wiped out and Hezekiah became internationally famous.
April 10th
The Bible doesn't describe a heliocentric system, but that's okay because we don't observe heliocentricity. It's a theoretical interpretation of the empirical geocentrospheric reality: it's imaginary.