What does Revelation 21:24 mean?

Based on the vague timeline given in these passages, and the description of New Jerusalem "coming down" (Revelation 21:10), some scholars suggest New Jerusalem is hovering above earth during the millennium. According to that assumption, it seems the light from the eternal city will be so strong that the nations on the millennial earth—as in, seemingly the entire planet—will walk in it. However, those who dwell on the earth during the millennium will also have sunlight and moonlight. Zechariah 14:7 predicts, "And there shall be a unique day, which is known to the Lord, neither day nor night, but at evening time there shall be light." The saved rulers of the earth will enjoy access to New Jerusalem and will bring their glory into it.

Based on those prior verses and the sheer size of the city, some interpreters suggest New Jerusalem will hover over the earth during the millennium and the regenerate rulers on earth will travel back and forth to the city. As of this writing, spacecraft shuttle cargo and passengers into space, so it is not hard to foresee such travel back and forth to New Jerusalem during the millennium and beyond.

Likely, the millennial residents of New Jerusalem will have access to the millennial earth without the aid of space shuttles. Their glorified bodies are capable of transcending space and matter, just as the risen Lord did when He entered the room with locked doors, where His disciples were gathered (John 20:19).