Knowledge
Calendar Models
How do you measure a year - by the Sun, by the Moon, or by both? This topic tree orders the calendars of the world and leads to the Germanic lunisolar calendar.
- The Sky as the Oldest Clock
- Solar Calendars
- Egyptian Calendar (planned)
- Julian & Gregorian Calendar (planned)
- Lunar Calendars
- Pure Lunar Calendars
- Islamic Calendar (planned)
- The 33-Year Lunar-Solar Cycle
- Lunisolar Calendars
- The Metonic Cycle
- The Octaeteris
- Germanic Lunisolar Calendar
- Months
- Germanic Month Names
- Leap Month (planned)
- Month Reckoning (planned)
- Month Portraits
- Festivals
- Winter Nights
- Yule (planned)
- Sigrblot (planned)
- Midsummer (planned)
- Ostara/Eostre (planned)
- Weeks & Days (planned)
- Germanic Day Names (planned)
- Things (planned)
- Thing & Moon Dates (planned)
- Months
- Hebrew Calendar (planned)
- Chinese Calendar (planned)
- Japanese Calendar (planned)
- Celtic Calendar (planned)
- Roman Calendar (planned)
- Greek Calendar (planned)
- Pure Lunar Calendars
About this sky
Level 1 shows the observed sky: the circles are diurnal arcs — the daily paths around the celestial pole; the starfield turns with them. The rotation is source-backed: the world-mill is turning (Zautner ch. 1; Vafþrúðnismál 23 — Mundilfæri, father of Sun and Moon; the medieval mill simile in AM 685 d). The 19 fine rings are its grinding traces — the Metonic cycle after which sun and moon realign. Sun and moon travel one shared path, opposite each other (full-moon position) — in the sky both appear equal in size (the 0.5° coincidence). Within each system: inner orbits are published, outer ones planned (faintly glowing); inner orbits run faster (Kepler); size follows the subtree's mass.
