Living with calendars
Each tool anchors a practical workflow: span calculators to compare planning cycles, timezone converters to keep remote teams aligned, and historical articles to ground decisions in the rhythm of science and culture.
Downloads
Grab the calendar plan, cheatsheet, and lore markdown for briefs or training decks.
First calendars
Recall why shadows and lunar cycles were the original scheduling tools.
Atomic time
Understand how cesium fountains became the pulse for every networked system.