Cultural Calendar Records

The Hijri calendar contains twelve lunar months and is roughly eleven days shorter than the solar year, so observances move through every season over time.

Several early Irish seasonal festivals are historically documented. The eight-part Wheel of the Year used today is a modern synthesis combining those festivals with solstices and equinoxes.

The traditional Chinese calendar combines lunar months with a solar framework. The twenty-four solar terms track the Sun's annual position and guide agriculture and seasonal observance.

There is no single universal Hindu calendar. Regional systems use different month names, eras, new-year points, lunar rules, and solar calculations.

Buddhist communities use several regional calendars. Dates and names differ across Theravada, East Asian Mahayana, Himalayan, and other traditions.

The Tibetan calendar uses lunar months, intercalation, and calendrical calculations that can differ among traditions and published almanacs.

Zoroastrian communities use several calendar systems, including Shahenshahi, Kadmi, and Fasli, so the same festival may occur on different Gregorian dates.

Pre-Christian Scandinavian timekeeping was lunisolar and locally variable. Modern Heathen calendars reconstruct practice from medieval texts, archaeology, folklore, and later custom.

The Ethiopian and Coptic calendars use twelve thirty-day months plus a short intercalary month of five days, or six in a leap year.

Classic and contemporary Maya timekeeping includes interlocking cycles rather than a single calendar equivalent to the Gregorian year.

The Bahá'í calendar has nineteen months of nineteen days, plus four intercalary days or five before a leap year. Days begin at sunset.

Sikh calendrical practice includes the Nanakshahi calendar and, in some communities, dates tied to the older Bikrami system.