Sometimes objective truth can change from objective to subjective as understanding and proof progresses. For example, at one time the world was considered flat. Based on normal human experience at that time, there was no direct data to the contrary, so this was considered objective truth, based on the preponderance of observational and sensory data.
Today, we base the round earth assumption on others. In other words, although the earth is round, very few humans actually have their own direct sensory proof of this. You take the word of the experts.
Say there were no trustworthy experts. It would be easier to prove to yourself a flat earth than a round earth. The flat earth only requires looking outside at what appears to be endless flat land due to huge size. The round proof will require a tough sea voyage, to gather direct data, that few will have the stones to take. So it was consensus objective, based on the preponderance of direct observation, that the earth was once flat.
This consensus observational objectivity of a flat earth, changed to subjective, after some people risked the journey to gain direct proof. The consensus then defined this as objective.
Even today in science, even if a theory was conceptually true, if it lacks data, the old theory is considered objective truth, due to consensus objective data. But if the new data appears, the old can change to subjective. The old worked with the smaller data set; a local arc of the curve. But this arc would now be subjective for the larger arc on the curve.
