Word origin · etymology
Editorial geographic adjectives.
Bhutanese, Mongolian, and Tibetan derive from regional or people-names. The heading groups calendar versions by place and transmission without translating those names into invented roots.
How we know · epistemology
System-specific sources and conventions
This entry covers Bhutanese / Mongolian / regional Tibetan calendars. Its cited texts document the methods or teachings being compared; any computed result depends on the stated inputs and rules. Historical attestation and reproducible arithmetic do not by themselves test a personal interpretation.
Tibetan calendar mathematics — Svante Janson, Uppsala University ↗Tibetan Astro Sciences — Alexander Berzin ↗
Connected concepts
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These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.