Next let's talk about the explaination of 5cm per second:
5cm per second is not a high speed,or we can even say it's a very low speed.
But if we keep this speed for 13 years,the distance it passes is equal to the distance to half of rounding the earth,which also means the distance between the two pole on earth.
It surely may just be a coincidence,but the time between their first meeting in track and their last meeting is precisely 13 years.
But if all these are not a coincidence,we can only gasp the outline of Newsea city is such precise.
Two loved each other once,after 13 years,reach at the furthest distance one another.
純手動!