Almanac
Calendar and lunar tools — the computational side of the church year, after the manner of the old Calendar Explorer.
🌙 Moon Phases
Every phase for a year with full and new moon dates, blue moons, and how the ecclesiastical "Paschal full moon" behind Easter compares with the astronomical sky.
Open →📅 Date of Easter
Easter and every movable feast for a range of years, Western and Eastern side by side — with the years they coincide.
Open →🌑 Passover & the Paschal Moon
The spring full moon (14 Nisan) reconstructed astronomically — from the Exodus era to the present, on both calendars.
Open →📊 Easter Statistics
Earliest and latest Easter, how often it falls on each date, and the years East and West agree.
Open →✠ Movable Feasts
Every feast that moves with Easter — Septuagesima through Corpus Christi — for any year.
Open →🔄 Calendar Converter
Convert between the Julian and Gregorian calendars, with the Julian day number.
Open →❓ Help & Guide
How each tool works — and a short history of why calculating Easter is so hard.
Open →