Daily hexagram archive
Every day's hexagram and line, archived — chosen by a public date-digest rule that never repeats the same day's hexagram two years in a row.
The rule is public: each day's hexagram comes from SHA-256("hexagramcast-daily-v2:<date>") — the first 8 hex chars mod 64 pick the hexagram, the next 8 mod 6 pick the line; a pick that repeats the past 7 days or the same day last year shifts to the next hexagram. Anyone can replay the whole sequence from 2026-06-04.