sense of time on time   

blurred approximate

Time as an acknowledged ignorance.

references & inspiration

Our vision of the world is blurred because the physical interactions between the part of the world to which we belong and the rest are blind to many variables. Temporality is profoundly linked to to blurring. The blurring is due to the fact that we are ignorant of the microscopic details of the world. The time of physics is, ultimately, the expression of our ignorance of the world. Time is ignorance.
- Carlo Rovelli. The Order of Time
Circa (from Latin, meaning 'around, about'), means "approximately" in several European languages, usually in reference to a date. Circa is widely used in historical writing when the dates of events are not accurately known.
- Wikipedia