JWs explain that the earth is at a precise distance from the sun because god made it so, and that the 'earth stands forever'.
Whether or not god made it so concerning the orbit, science suggests that the sun has other ideas for whether or not the earth 'stands forever'.
If one reduces the reasons for Earth's precise orbital distance to the necessary and sufficient, one uncovers an anthropological conceit: The orbit of the earth is so precise not because the earth is designed to harbor intelligent life, but rather intelligent life is able to be harbored on Earth because these last few billion years have found the earth remaining within the sun's outwardly-migrating habitable zone.
"Distant future of the Sun and Earth revisited"