Word origin · etymology
English descriptive calendar phrase; Tibetan technical term chad.
Berzin records chad for an omitted lunar date. Omitted describes the absent label; no claim about the term’s first historical use is made.
Alexander Berzin · Tibetan-English Glossary of Astrology Terms ↗
How we know · epistemology
Consequence of a named calendar’s date-assignment rules
In this Phugpa implementation, successive lunar endpoints assigned to the same civil day leave one label without a civil occurrence. This is a calculated status, not a missing physical day or a personal omen.
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.