PART V - PUTTING MARIAN ON TRIAL
Does Marian Actually Work?

Designs are easy to admire from inside their own assumptions.

The harder test is to expose them.

Marian now faces Five Tests of a Civil Calendar:

Fit — does it satisfy its own brief?
Compare — how does it stand against serious alternatives?
Admit — what does it sacrifice, not know or deliberately exclude?
Build — what would make it dependable infrastructure?
Release — what happens when the calendar belongs to its users rather than its designer?

These are deliberately different tests, and passing one does not answer the others.

A mathematically coherent calendar can still be awkward to use. A usable one can fail to become a dependable standard. A standard can remain culturally foreign. Technical success, practical usefulness and eventual ownership are not the same thing.

Part V therefore moves from verification to comparison, from comparison to limitation, from limitation to implementation, and finally from implementation to ownership.

The final question is larger than whether Marian's arithmetic works.

It is whether this could become ordinary time.