It is a light thing for the shadow to go down[R.V. decline] ten degrees R.V. steps. The verb is not the same as that translated -to go down" in verse 11. The king's meaning is that it appears more natural and therefore easier, for the shadow to make a sudden advance in the direction in which it has been already going, than to turn in the contrary way.

let the shadow return backward ten degrees R.V. steps. Thus reversing the order of nature.

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