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TimeLedgers

The authority educational archive on celestial chronometry, world calendar systems, global time zone standards, and the mechanical evolution of horology.

Calendars

Calendar Systems
Solar vs. Lunar Mechanics
Gregorian & Julian Drift
Islamic Hijri Calendar
Chinese 60-Year Cycle

Time & Clocks

World Time Zones
UTC vs. GMT Standards
International Date Line
History of Horology
Mechanical Escapements

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