Obsolete calendars

calendar

system of calendars used in pre-Columbian Mesoamerica

lunisolar calendar

calendar

calendar in use in Sweden from 1700 to 1712

modified Gregorian calendar that was used in Soviet Russia between 1918 and 1940

perpetual calendar based on the 19 year long Metonic cycle of the Moon

lunisolar calendar

chronometry

non-repeating base-20 and base-18 calendar used by several pre-Columbian Mesoamerican cultures, including the Maya

right|280px|thumb|Page 11 reverse from , showing four day-symbols of the : ( = one) Flint/Knife , ( = two) Rain , ( = three) Flower , and ( = four) Caiman/Crocodile (), with Spanish descriptions. thumb|Above is the Codex Telleriano-Remensis: Folio 10r annotated to identify the day signs (Tonalpohualli) and counts on the page. This page includes the later half of a Trecena, starting with 6 grass (6 Malinalli) and ending with 13 rain (13 Quiyahuitl). The Trecena progresses from the second row and the first column and continues to the right. Once it is five columns in the order it progresses down

lunisolar calendar

obsolete Germanic calendars

The xiuhpōhualli (, from (“year”) + (“count”)) is a 365-day calendar used by the Aztecs and other pre-Columbian Nahua peoples in central Mexico. It is composed of eighteen 20-day "months," which through Spanish usage came to be known as (“scores, groups of twenty”), with an inauspicious, separate 5-day period at the end of the year called the . The name given to the 20-day periods in pre-Columbian times is unknown, and though the Nahuatl word for moon or month, , is sometimes used today to describe them, the sixteenth-century missionary and ethnographer, Diego Durán explained that:

calendar used in the Republic of Florence in Italy during the Middle Ages

calendar used in Pisa from the Middle Ages until at least 1406

Mesopotamian calendar, whose year consists of 7 periods of 50 days, with an annual supplement of 15 or 16 days

solar calendar system used by the Bulgars