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Timeline Of Interesting Calendar Facts | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About A page from the "Calendars" exhibit... Length of the tropical year, defined as the average interval between vernal equinoxes. This calendar year was the objective of the Gregorian calendar reform, which finalized the calendar as we use it today. 365 days, 5 hours, 49 minutes (365.2424 Universal days) Lengthening of the vernal equinox year over the last two millennia About 10 seconds (0.0001 universal days per year) Variation of this length in the next few millennia less than 5 seconds Lunar month in 2000 C.E. 29 days, 12 hours, 44 minutes, 2.9 seconds The earliest known date 4236 B.C.E., the founding of the Egyptian calendar Ancient Egyptian calendar year 365 Date Emperor Huangdi invented the Chinese calendar (legend) 2637 B.C.E. Early Chinese year 354 days (lunar year) with days added at intervals to keep the Chinese lunar calendar aligned with the seasons Early Greek year 354 days, with days added Jewish Year 354 days, with days added Early Roman ... http://www.webexhibits.org/calendars/timeline.html · 13.0k |
Indian Calendar | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Overview Chinese Christian Indian Islamic Jewish Others Ancient French Future Mayan Roman Perpetual A page from the "Calendars" exhibit... Festival. Surajkund Mela, Haryana, India A group of women dress colorfully for an Indian festival. As a result of a calendar reform in 1957 C.E., the National Calendar of India is a formalized lunisolar calendar in which leap years coincide with those of the Gregorian calendar (Calendar Reform Committee, 1957). However, the initial epoch is the Saka Era, a traditional epoch of Indian chronology. Months are named after the traditional Indian months and are offset from the beginning of Gregorian months (see the table below). In addition to establishing a civil calendar, the Calendar Reform Committee set guidelines for religious calendars, which require calculations of the motions of the Sun and Moon. Tabulations of the religious holidays are prepared by the India Meteorological Department and published annually in The ... http://www.webexhibits.org/calendars/calendar-indian.html · 18.4k |
History Of Our Calendar | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Overview Astronomy Perpetual calendar Month of Moons Today's Moon History Definitions International Do it yourself A page from the "Calendars" exhibit... Pope Gregory XIII. Portrait by Lavinia Fontana Pope Gregory XIII dedicated his papacy to implementing the recommendations of the Council of Trent. By the time he reformed the Julian calendar in 1582 (using the observations of Christopher Clavius and Johannes Kepler), it had drifted 10 days off course. To this day, most of the world uses his Gregorian calendar. Before today’s Gregorian calendar was adopted, the older Julian calendar was used. It was admirably close to the actual length of the year, as it turns out, but the Julian calendar was not so perfect that it didn’t slowly shift off track over the following centuries. But, hundreds of years later, monks were the only ones with any free time for scholarly pursuits – and they were discouraged from thinking about the matter of "secular time" for any reason ... http://www.webexhibits.org/calendars/year-history.html · 18.7k |
The Chinese Calendar | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About A page from the "Calendars" exhibit... Chinese New Year Celebrations Chinese New Year parades have their origins in the California Gold Rush, when immigrants sought to share their culture. Today, New Year’s parades take place around the globe. Chinese New Year is the main holiday of the year for more than one quarter of the world’s population. Although the People’s Republic of China uses the Gregorian calendar for civil purposes, a special Chinese calendar is used for determining festivals. Various Chinese communities around the world also use this calendar. The beginnings of the Chinese calendar can be traced back to the 14th century B.C.E. Legend has it that the Emperor Huangdi invented the calendar in 2637 B.C.E. The Chinese calendar is based on exact astronomical observations of the longitude of the sun and the phases of the moon. This means that principles of modern science have had an impact on the Chinese calendar. What Does the Chinese Year Look Like? What ... http://www.webexhibits.org/calendars/calendar-chinese.html · 25.4k |
The Christian Calendar | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Overview Chinese Christian Indian Islamic Jewish Others Ancient French Future Mayan Roman Perpetual A page from the "Calendars" exhibit... The "Christian calendar" is the term traditionally used to designate the calendar commonly in use, although it originated in pre-Christian Rome. This calendar is used by the United States, and most countries in the world. This section presents historical information about the Christian calendar. For more current information about how our calendar works today, see the section on Our Year. The Christian calendar has years of 365 or 366 days. It is divided into 12 months that have no relationship to the motion of the moon. In parallel with this system, the concept of weeks groups the days in sets of 7. Two main versions of the Christian calendar have existed in recent times: The Julian calendar and the Gregorian calendar. The difference between them lies in the way they approximate the length of the tropical year and their ... http://www.webexhibits.org/calendars/calendar-christian.html · 27.8k |
The Islamic Calendar | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Overview Chinese Christian Indian Islamic Jewish Others Ancient French Future Mayan Roman Perpetual A page from the "Calendars" exhibit... The Kabba. Mecca, Saudi Arabia. According to Islamic tradition, the cube-shaped Kabba dates back to the time of Abraham. It is the most sacred Muslim site, and the location towards which all Muslims face during prayer. The Islamic calendar (or Hijri calendar) is a purely lunar calendar. It contains 12 months that are based on the motion of the moon, and because 12 synodic months is only 12 x 29.53=354.36 days, the Islamic calendar is consistently shorter than a tropical year, and therefore it shifts with respect to the Christian calendar. The calendar is based on the Qur'an (Sura IX, 36-37) and its proper observance is a sacred duty for Muslims. The Islamic calendar is the official calendar in countries around the Gulf, especially Saudi Arabia. But other Muslim countries use the Gregorian calendar for civil purposes ... http://www.webexhibits.org/calendars/calendar-islamic.html · 13.5k |
Our Year | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Overview Astronomy Perpetual calendar Month of Moons Today's Moon History Definitions International Do it yourself A page from the "Calendars" exhibit... Illuminations of Dante’s Divine Comedy by Giovanni di Paolo (15th century) Dante and Beatrice reach the sun, shown as a golden wheel sending golden rays to the landscape below. The Sun, located in the middle of the orbs, with three lesser above and three below, like the heart in the middle of the body, or a wise king in the middle of his kingdom. The calendar is based on three key astronomical events. A day, which is the time from one sunrise to the next sunrise — one complete rotation of the Earth. A year, which is approximately 365.24 days — one complete orbit of Earth around the Sun. A month, which is approximately 29.53 days — one complete orbit of the Moon around the Earth. Since these time spans are not easily divided, calendars have always been imperfect. Some were rooted in tradition, while others ... http://www.webexhibits.org/calendars/year.html · 10.8k |
Definitions Of Our Year | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Overview Astronomy Perpetual calendar Month of Moons Today's Moon History Definitions International Do it yourself A page from the "Calendars" exhibit... The calendar used throughout the world today is the Gregorian calendar. It is sometimes called a "Christian" calendar, and additional historic information about this calendar, and its precursor, the Julian calendar, are available in the history of the Cristian calendar section. The Gregorian calendar is the one commonly used today. It was proposed by Aloysius Lilius, a physician from Naples, and adopted by Pope Gregory XIII (portrait above right) in accordance with instructions from the Council of Trent (1545-1563) to correct for errors in the older Julian Calendar. It was decreed by Pope Gregory XIII in a papal bull, Inter Gravissimas, on February 24, 1582 (shown at right). This bull is named "Inter Gravissimas" after its first two words. In the Gregorian calendar, the tropical year is approximated as 365 97/ ... http://www.webexhibits.org/calendars/year-definitions.html · 34.8k |
Astronomical Basis Of Calendars | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Overview Astronomy Perpetual calendar Month of Moons Today's Moon History Definitions International Do it yourself A page from the "Calendars" exhibit... The principal astronomical cycles are the day (based on the rotation of the Earth on its axis), the year (based on the revolution of the Earth around the Sun), and the month (based on the revolution of the Moon around the Earth). The complexity of calendars arises because these cycles of revolution do not comprise an integral number of days, and because astronomical cycles are neither constant nor perfectly commensurable with each other. What are different measures of the year? What are Equinoxes and Solstices? Did the church study astronomy? Didn’t the church condemn Galileo? How did the observatories work? How did Cassini prove Kepler was right? What are different measures of the year? The tropical year is defined as the mean interval between vernal equinoxes; it corresponds to the cycle of the seasons ... http://www.webexhibits.org/calendars/year-astronomy.html · 24.4k |
Other Ancient Calendars | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Overview Chinese Christian Indian Islamic Jewish Others Ancient French Future Mayan Roman Perpetual A page from the "Calendars" exhibit... When did ancient months start? When was the ancient new year? Babylonian calendar Egyptian calendar Other calendars used in the ancient Near East The rainy season Synergy with the earth Cro-magnon man (Lascaux caves in France) Iceland (before literacy) → See detailed information on the early Roman calendar. When did ancient months start? In the eighth century B.C.E., civilizations all over the world either discarded or modified their old 360 day calendars. The 360 day calendars had been in use for the greater part of a millennium. In many places, month lengths immediately after that change were not fixed, but were based instead upon observation of the sky. Priest-astronomers were assigned the duty of declaring when a new month began – it was usually said to have started at the first sighting of a new moon. ... http://www.webexhibits.org/calendars/calendar-ancient.html · 49.5k |
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