Compute Easter via Meeus/Jones/Butcher algorithm #15

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opened 2026-07-01 00:50:50 +00:00 by manlycucumber · 0 comments

manlycucumber commented

2026-07-01 00:50:50 +00:00

(Migrated from github.com)

Problem

The entire temporal cycle is anchored to Easter. A clean-room Computus implementation is the keystone of phase one of the resolver.

Acceptance criteria

Computus returns the Gregorian Easter date for any year via Meeus/Jones/Butcher
Implementation is pure with no external dependency
Unit tests cover a spread of known Easter dates across centuries
Edge years (earliest 22 Mar, latest 25 Apr) are asserted

Notes

Cross-checked against PHP easter_days() in the validation epic.

## Problem The entire temporal cycle is anchored to Easter. A clean-room Computus implementation is the keystone of phase one of the resolver. ## Acceptance criteria - [ ] Computus returns the Gregorian Easter date for any year via Meeus/Jones/Butcher - [ ] Implementation is pure with no external dependency - [ ] Unit tests cover a spread of known Easter dates across centuries - [ ] Edge years (earliest 22 Mar, latest 25 Apr) are asserted ## Notes Cross-checked against PHP `easter_days()` in the validation epic.

manlycucumber referenced this issue from a commit

2026-08-05 19:02:29 +00:00

feat: add Computus for Gregorian Easter (Meeus/Jones/Butcher) (#206)

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Reference

Directorium/Core#15

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