“The 23.5 degree number is the average that is the simplified version for children’s textbooks.”
Well, then, I had better put away my orbital mechanics books and rewrite some equations I wrote since they’re just cartoons and probably not working. /drippy-drippy-sarcasm
The 23.5 is a close enough number for discussions but the Earth is not going to change much from that in our lifetime.
The initial discussion related to long time frames regarding the statement by another that the earth ‘does not wobble’. What can be used for calculations over the minute time-frame of human lifetime or history doesn’t really play into the geologic time-frames we are discussing. The point was regarding the 2 degree wobble over a 41k year period, not enough to impact small time-frame calculations we need, but significant over the millions of years of earth’s history.