Heavenly Calendar

The Heavenly Calendar is the lunar calendar used within the Unification movement to track the ten Holy Days, Ahn Shil Il and other providential observances. Most of the movement’s key dates were established by the lunar calendar, so their Gregorian equivalents shift each year. By observing it, members order their weeks around Ahn Shil Il and their year around the Holy Days rather than around national or commercial holidays alone.

Every Holy Day is fixed to a lunar date, so its Gregorian equivalent shifts each year. They fall on these dates:

• The ten Holy Days are listed with their dates in the table above.

The Heavenly Calendar fixes ten canonical Holy Days, each keyed to a lunar month and day:

• 1.1God’s Day
• 1.6True Parents’ Birthday
• 1.13Foundation Day
• 3.16True Parents’ Holy Wedding
• 5.1Day of All True Things
• 7.1Declaration Day of God’s Eternal Blessing
• 7.7Cosmic Sabbath
• 7.17True Father’s Seonghwa
• 10.1True Children’s Day
• 10.3Foundation Day for the Unified Nation

Each marks a providential milestone rather than a seasonal festival. Observances outside this canon, such as True Parents’ Day and the Day of Victory of Love, are still commemorated and appear on the calendar above.

Because every Holy Day is fixed to a lunar date, not a Gregorian one. God’s Day is always the first day of the first lunar month — but that first day lands on a different Gregorian date each year. The lunar year runs about 354 days, eleven shorter than the solar one, so the dates drift backwards through the seasons and then jump forward again when a leap month is inserted. This calendar does the conversion for you, in both directions.

Ahn Shil Il — “day of rest” — is the weekly observance marked in blue on the calendar above. It is understood as a day of spiritual restoration: families gather, recite the Family Pledge, engage in Hoon Dok Hae, and rest from ordinary labour as a reflection of their alignment with God’s creative rhythm.

Ahn Shil Il repeats every eighth day, counted continuously from a fixed reference date rather than from the start of each month. Because eight does not divide evenly into a seven-day week, it moves across the weekdays — a Saturday this time, a Sunday the next, then a Monday. The rhythm belongs to the providential cycle rather than to the civil week, so it never settles onto a weekend. The calendar above marks every occurrence, so there is nothing to count by hand.

The Cheon Il Guk era is counted from Foundation Day, January 13, 2013, which is year 1. The year turns at the lunar new year rather than on January 1, so the first weeks of a Gregorian January still belong to the previous Cheon Il Guk year. The card at the top of this page always shows the current one.

Use the Add to your calendar button above the calendar grid and pick Google Calendar, Apple Calendar or Outlook. That subscribes you to a live feed, so the Holy Days and Ahn Shil Il appear next to your everyday events on every device signed into that account. You do it once — each following year arrives on its own, with nothing to download again. Google Calendar is the slow one: it adds the calendar at once but fetches the dates on its own schedule, so give it a few hours before the Holy Days and the name “Heavenly Calendar” show up. Any other app that understands the standard iCalendar format can use the same address. If you would rather keep a fixed copy that never changes, the same panel offers a one-time .ics download where you choose the year range and whether to include the secondary observances.

Yes. The Print button offers four layouts: the current month on one A4 page, a compact overview of all twelve months on a single page, a full year at one month per page, and a one-page table of the ten Holy Days with their Gregorian dates. Lunar dates and event names can each be switched off, and an ink-saver option prints everything in black and white.

Open Print above the calendar, choose the layout you want, then pick “Save as PDF” as the destination in your browser’s print dialog instead of a printer. On iPhone and iPad, use Share → Print, then pinch outwards on the preview to open it as a PDF you can save or send.

Two ways. The simplest is the iframe embed: click Embed above the calendar, copy the generated code and paste it into your HTML. Developers who want to self-host or restyle it can take the full source from the repository at github.com/Jon-tplegacy/Heavenly-Calendar. Both are free under CC BY-SA 4.0 and keep attribution to True Parents Legacy.

Every date is computed from the open Heavenly Calendar dataset, converted with a Korean lunar calendar library and checked against fixed solar–lunar reference points. The dataset, the conversion code and the calendar itself are published under CC BY-SA 4.0 at github.com/Jon-tplegacy/Heavenly-Calendar, so anyone can verify a date, cite it, or propose a correction.