Word origin · etymology
Romanized Chinese calendrical name Yi (乙), ordinal 2.
Historical character derivation is not established by the cited calendar tables.
How we know · epistemology
Calendrical convention
Stem phase and polarity are calendrical classifications, not traits.
Connected concepts
Read alongside this entry
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.