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Wikipedia:On this day/Today. Wikipedia:Selected anniversaries/May 21 [ talk · edit · history ] May 21: World Day for Cultural Diversity for Dialogue and Development. 1138 – The Crusades: The siege of Shaizar ended, and the Emir of Shaizar became a vassal of the Byzantine Empire. 1864 – American Civil War: The inconclusive Battle of ...
Unix time. 1546300800 – 1577836799. 2019 ( MMXIX) was a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium and the 21st century, and the 10th and last year of the 2010s decade.
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- Etymology
- Prehistory
- Ancient Near East
- Antiquity
- Middle Ages
- Sub-Saharan African
- Mesoamerica
- Modern Calendars
- See Also
- References
The term calendars itself is taken from the calends, the term for the first day of the month in the Roman calendar, related to the verb calare "to call out", referring to the calling or the announcement that the new moon was just seen. Latin calendariummeant "account book, register", as accounts were settled and debts were collected on the calends ...
A number of prehistoric structures have been proposed as having had the purpose of timekeeping (typically keeping track of the course of the solar year). This includes many megalithic structures, and reconstructed arrangements going back far into the Neolithicperiod. In Victoria, Australia, a Wurdi Youang stone arrangement could date back more than...
The ancient Sumerian calendar, roughly dated to 2,100 BC, divided a year into 12 lunar months of 29 or 30 days. Each month began with the sighting of a new moon. Sumerian months had no uniform name throughout Sumer because of the religious diversity. This resulted in scribes and scholars referring to them as "the first month", "the fifth month", et...
Babylonia and Persia
Although the earliest evidence of Iranian calendrical traditions is from the second millennium BC, predating the appearance of the Iranian prophet Zoroaster, the first fully preserved calendar is that of the Achaemenids. Throughout recorded history, Persians have been keen on the idea and importance of having a calendar. They were among the first cultures to use a solar calendar and have long favoured a solar over lunar and lunisolar approaches. The sun has always been a symbol in Iranian cul...
Classical Greece
The Greeks, as early as the time of Homer, appear to have been familiar with the division of the year into the twelve lunar months but no intercalary month Embolimos or day is then mentioned. Independent of the division of a month into days, it was divided into periods according to the increase and decrease of the moon. Thus, the first day or new moon was called Noumenia. The month in which the year began, as well as the names of the months, differed among the states, and in some parts even n...
Hellenistic period
The Greek calendars were greatly diversified by the Hellenistic period, with separate traditions in every Greek state. Of primary importance for the reconstruction of the regional Greek calendars is the calendar of Delphi, because of the numerous documents found there recording the manumission of slaves, many of which are dated both in the Delphian and in a regional calendar. The Macedonian Era of the Seleucids, which began with the conquest of Babylon by Seleucus I Nicator in 312 BC. It beca...
Christian Europe
The oldest calendar of saints of the Church of Rome was compiled in the mid-4th century, under Pope Julius I or Pope Liberius. It contained both pagan and Christian festivals. The oldest extant manuscript of the early Christian calendar is the so-called Calendar of Filocalus, produced in AD 354. A more extensive martyrology was compiled by Jerome in the early 5th century. Jean Mabillon published a calendar of the church of Carthage made in ca. AD 483. The Anno Domini epoch is introduced in th...
Islamic calendar
The Islamic calendar is based on the prohibition of intercalation (nasi') by Muhammad, in Islamic tradition dated to a sermon held on 9 Dhu al-HijjahAH 10 (Julian date: 6 March 632). This resulted in an observationally based lunar calendar shifting relative to the seasons of the solar year. During the Mughal rule, land taxes were collected from Bengali people according to the Islamic Hijri calendar. This calendar was a lunar calendar, and its new year did not coincide with the solar agricultu...
Other
The ancient Taichu calendar of China was refined in the medieval period. The Dàmíng Calendar (大明历; 大明曆; 'brightest calendar'), created in the Liang dynasty by Zu Chongzhi, introduced the equinoxes. The use of a syzygy to determine the lunar month was first described in the Tang dynasty Wùyín Yuán Calendar (戊寅元历; 戊寅元曆; 'earth tiger epoch calendar'). The Yuan dynasty (13th/14th century) Shòushí calendar (授时历; 授时曆; 'teaching time calendar') used spherical trigonometry to find the length of the t...
Ethiopian Calendar
The Ge'ez or Ethiopian Calendar is a calendar originating from the Ethiopian Empire. It is the liturgical year for Ethiopian and Eritrean Christians belonging to the Orthodox Tewahedo Churches and closely follows the Coptic Christian calendar.
Nigerian Calendars
The Igbo calendar is the traditional calendar system of the Igbo people from present-day Nigeria. The calendar has 13 months in a year (afo), 7 weeks in a month (onwa), and 4 days of Igbo market days (afor, nkwo, eke, and orie) in a week (izu) plus an extra day at the end of the year, in the last month. The name of these months was reported by Onwuejeogwu (1981). The Yoruba calendar is a calendar used by the Yoruba people of southwestern and north central Nigeria and southern Benin. The calen...
Ghana/West African
The Akan Calendar is a Calendar created by the Akan people (a Kwa group of West Africa) who appear to have used a traditional system of timekeeping based on a six-day week (known as nnanson "seven-days" via inclusive counting). The Gregorian seven-day weekis known as nnawɔtwe (eight-days). The combination of these two system resulted in periods of 40 days, known as adaduanan (meaning "forty days").
Of all the ancient calendar systems, the Maya and other Mesoamerican systems are the most complex. The Mayan calendar had two years, the 260-day Sacred Round, or tzolkin, and the 365-day Vague Year, or haab. The Sacred Round of 260 days is composed of two smaller cycles: the numbers 1 through 13, coupled with 20 different day names: Imix, Ik, Akbal...
While the Gregorian calendar is now in worldwide use for secular purposes, various medieval or ancient calendars remain in regional use for religious or social purposes, including the Julian calendar, the Hebrew calendar, the Islamic calendar, various Hindu calendars, the Zoroastrian calendar, etc. There are also various modern calendars that see l...
Works cited
1. Ohashi, Yukio (1993). "Development of Astronomical Observations in Vedic and post-Vedic India". Indian Journal of History of Science. 28(3). 2. Panaino, Antonio (1990). "CALENDARS, i. Pre-Islamic calendars". Encyclopaedia Iranica. Vol. 4. ISBN 0-7100-9132-X. 3. Pingree, David (1973). "The Mesopotamian Origin of Early Indian Mathematical Astronomy". Journal for the History of Astronomy. 4 (1). SAGE: 1–12. Bibcode:1973JHA.....4....1P. doi:10.1177/002182867300400102. S2CID 125228353. 4. Plofk...
April 13. April 13 is the 103rd day of the year (104th in leap years) in the Gregorian calendar; 262 days remain until the end of the year.
Full 12-month 2019 Calendar plus selected historical events of 2019.
Find out what happened on any day in any month in history via our on this day in history calendar. Includes important events, famous birthdays and deaths.
