The references to the conceptual development of the Ouroboros imagery is perhaps best captured within Wikipedia!

An important concept, it is most difficult to break out of self-referential systems.

There will be more to come…
https://en.wikipedia.org/wiki/Initial_value_problem
https://en.wikipedia.org/wiki/Inertial_frame_of_reference

The Ouroboros Model by Knud Thomsen