Research notes
Each note takes one question about how a calendar is actually computed, investigates it with data, and says where the answer stops being certain. They are written to be checked: every figure comes from published sources or from code whose output ships with the note.
-
When the new moon falls near midnight: ICU’s Chinese calendar against the Hong Kong Observatory
Day by day from 1901 to 2100, where the Chinese calendar built into JavaScript parts from the Hong Kong Observatory, what causes each disagreement, and the three months this century that no one can yet date.