This web-based app shows a Gregorian Calendar, a Julian Calendar, a Jewish Hillel Calendar, and a unique 'Elijah' luni-solar calendar.

You can explore dates in the future and past to see equivalent dates on other calendars.

The 'Elijah' Calendar is a luni-solar calendar with the following rules:
- The day always starts at sunset
- The first of the month always has a new moon (by conjunction - not first crescent), making each month 29 or 30 days (A synodic month, the average time between new moons, is 29.53 days)
- The year has 12 or 13 lunar months in a 19 year cycle, following the same pattern and names as the Hillel calendar, but offset by 5 years
- Unlike the Hillel Calendar, the Elijah calendar has no 'postponements'.

Copyright © 2011 Relative Data, Inc and Elijah.com

Extra Credits & Copyrights:

VSOP87 astronomy database is in the public domain

Astronomy and time algorithms - Copyright © 2011 Relative Data, Inc.

All Rights Reserved