O Lord GOD, thou hast begun to shew thy servant thy greatness, and thy mighty hand: for what God is there in heaven or in earth, that can do according to thy works, and according to thy might? Deuteronomy 3:24.
And he said, LORD God of Israel, there is no God like thee, in heaven above, or on earth beneath, who keepest covenant and mercy with thy servants that walk before thee with all their heart, 1st Kings 8:23.
It is interesting that both phrases, in earth and on earth appear in our King James Bible 13 times each. For those of us who explore the wonders of our King James Bible, slight changes in prepositions make us perk up and pay attention. The idea that both phrases should occur in 13 (the number of rebellion) verses in their own right is also a point that should give us pause.
We could take the standard position that such little changes don't mean anything, but for those of us who have delved into the wonders of our bible, we perk up when we see such changes. To give an example of why the two should never be interchanged or treated as if they meant nothing, look at Hebrews 8:4; For if he were on earth, he should not be a priest, seeing that there are priests that offer gifts according to the law.
We can easily say that Jesus Christ is not on earth. We have an eye witness account of his ascension into heaven. We have prophecies of him coming back. What we cannot say is that Jesus Christ is not in earth. He inhabits our earthen vessels; But we have this treasure in earthen vessels, that the excellency of the power may be of God, and not of us, 2nd Corinthians 4:7. He also has a body which is an earthen vessel, Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh, Romans 1:3.
When we say, God was manifest in the flesh, 1st Timothy 3:16, we are saying that God made himself visible to us in a body of flesh such as Adam's. He was made out of the earth. And being found in fashion as a man, he humbled himself, Philippians 2:8.
There are three books in your bible that have 13 chapters, Nehemiah, 2nd Corinthians and Hebrews. Each of them deal with and signal the end of rebellion and victory over the antichrist. We can look at both on earth and in earth as God's victory over rebellion. He will establish his victory over rebellion on earth and he will establish it in earth.