Finnish (Elsa Jansson)
Bosnian (Amina Dugalic)
Hungarian (Elana Pavlet)
Czech (Ivana Horak)
Macedonian (Katerina Nestiv)
Estonian (Veronika Pawlak)
"Once pursued for its own sake, [astronomical observation] comes to provide the vehicle for scheduling rituals and coordinating the activities of complex society. With the help of the stars, the year and its divisions exist as instruments of organizational authority. The formation of a calendar is basic to the formation of a civilization. The calendar was the first symbolic artifact that regulated social behavior by keeping track of time." — John Zerzan: Time and Its Discontents
The Julian and
1. The Julian Calendar
2. The Gregorian Reform
3. Adoption of the Gregorian Calendar
4. Astronomical Year Numbering
5. The Proleptic Julian and Gregorian Calendars
6. Variation in the Tropical Year
7. Accuracy of the Gregorian and Orthodox Calendars
8. True Length of the Tropical Year
Astronomical Year Numbering and the Common Era Calendar The ISO Date Format A note concerning date formats, especially the ISO date format. Types of Calendar Lunar, solar, lunisolar, solar-count, etc. Julian Day Numbers The nature and origin of the Julian day number system. Chronological Julian Date An explanation of this concept with examples of use. The Dee-Cecil Calendar and its Date Conversion Algorithms A description of the Dee and Dee-Cecil Calendars, plus algorithms for conversion of dates in these calendars to and from Julian day numbers. John Dee's Calendar and God's Longitude John Dee's secret plan for the implementation of his new (in the 16th C.) 33-year-cycle calendar. Lunar Calendars The synodic month and how it is changing. The Hermetic Leap Week Calendar A calendar with an integral number of 7-day weeks in each year, and which stays in sync with the seasonal year. The Hermetic Lunar Week Calendar A solilunar calendar which avoids the problem of rescheduling with each new year. The Archetypes Calendar An accurate lunar calendar with (mostly) weeks of 10 days. Why Seven Days in a Week? Why not six or eight? The Maya Calendar Article about the Maya Calendar
See also the documentation for the Mayan Calendrics software
The Structure of the Chinese Calendar How the Chinese Calendar depends on the times of astronomical events. The Liberalia
A new calendar combining a lunar calendar and a solar calendar with 3-day cycles in common. The Meyer-Palmen
A calendar consisting of 60-year cycles which stays in sync both with the Moon and with the seasons. The Goddess Calendar A calendar whose 13 months accord with the lunar cycles and are named after thirteen goddesses. The Tabot Calendar A calendar with (mostly) 30-day months in which New Years Day always falls on November 2nd in the Gregorian Calendar. Two Integral-Week
Two new solar calendars in which years have an integral number of weeks. When Did the New
It depends on which system you use for numbering years.
Wann beginnt das neue Jahrtausend?
Quando É Que o Novo Milénio Começará?
Interconverting Tibetan and Western Years Interconverting Chinese and Western Years The Gregorian Calendar is a Religious Calendar
Writings by Other Scholars Lance Latham: Simon Cassidy: Karl Palmen: Duncan Steel: Robert Poole: Kaldarkhan Aliseituly Kambar:
- New Look At The Modern Codification Of The Mayan Calendar (PDF file)
- Kazakh National Calendar (PDF file) — Everything you eve wanted to know about the ancient Kazakh Nomad Moon-Pleiades Calendar but didn't know who to ask.
- KAZAKH NATIONAL CALENDAR — a PDF file in Russian which is an expanded version of the above PDF file in English.
Kirkpatrick Sale: Jean Meeus: John R. Beattie: Bohumil Böhm and Vladimir Böhm:
- The Dresden Codex — the Book of Mayan Astronomy
- The Prague Codex — the fifth preserved Mayan manuscript (a Word file, 535 Kb)
- Establecimiento de los años bisiestos en el Códice de Madrid (a Word file, 773 Kb, in Spanish)
- A calculation of leap years in the Codex of Madrid (a Word file, 540 Kb)
- Methods of calculation of Böhm's correlation (a Word file, 468 Kb)
William Becker: Paul Hill: W. M. Flinders Petrie:
Calendrical and Astronomical Links
Maya Calendar Links
An Inquiring Mind — the collected writings of Peter Meyer Date/Calendar Software Hermetic Systems Home Page