Word origin · etymology
Tibetan names alongside a Sanskrit title.
Phugpa names a calendar-author lineage; Tsurphu a monastery-linked tradition; Kālacakra means Wheel of Time. The slash preserves three different naming origins.
Svante Janson: Tibetan calendar mathematics ↗Sopa, Jackson and Newman: The Wheel of Time, publisher description ↗
How we know · epistemology
System-specific sources and conventions
This entry covers Phugpa / Tsurphu / Kālacakra. 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
Terms used in this explanation
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.