The name

Teiten is 定点, a fixed point. In Japanese it is the word used for a fixed observation post: the same instrument, in the same place, measuring the same thing, so that a change in the reading is a change in the world rather than a change in the method.

That is the whole editorial position. The measurements here are taken the same way each time, the way they are taken is published beside them, and when the method changes the change is dated.