The 72 micro-seasons, and why we rebuilt our changelog around them

The traditional Japanese calendar's 72 micro-seasons (kō) each last about five days and are named for something specific and observable: 'the first frost falls,' 'the mist starts to linger.' Not a category. An event.

Our old changelog was organised by quarter — Q1, Q2 — which is exactly the kind of empty bucket kō is a rebuke to. 'Q3 2026 updates' tells a user nothing. So we changed the format: every changelog entry is now dated to the week it shipped and named for what it actually did, no grouping, no quarterly theme copy written after the fact to make three unrelated fixes sound like a strategy.

It's a small change with a specific effect: you can now scan our changelog and know, in one line each, exactly what changed and when — the same way a farmer reading a kō calendar knows exactly what's happening in the field this week, not 'sometime this season.'