Open the Almanac

Byodoji Almanac

Convert a Gregorian date to the Japanese lunisolar calendar, then compare East Asian date selection, Sukuyō, annotated calendars, Hoki witnesses, regional almanacs, and modern research.

Selected date

Loading the lunisolar date and calendar notes.

How to read the Byodoji Almanac

This is a way to read a historical calendar system, not a verdict on the fortune of a day.

Calendar fortune did not arise from one period or one book. East Asian date selection, the Chinese Sukuyō scripture, Japanese annotated calendars, medieval selection manuals, regional calendars, popular almanacs, craft practice, and modern fortune calendars transmitted different rules and uses.

The Byodoji Almanac uses critically compared tables based on Hoki witnesses to calculate which notes appear on a selected date. Their meanings are then read across other traditions and scholarship, distinguishing direct evidence, wider group context, and points that remain unattested.

Favorable and unfavorable entries can appear together because they concern different activities and descend from different textual layers. Read the relevant activity, conditions, and variants rather than comparing totals.