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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 |
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 |
Our Week | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Our Week Connotations A page from the "Calendars" exhibit... Our seven day week has been used for millennia by the Christian, Jewish, Islamic, Persian and Chinese calendars, yet its origins are most uncertain. What Is the Origin of the 7-Day Week? What Do the Names of the Days of the Week Mean? What is the System behind the Planetary Day Names? Has the 7-Day Week Cycle Ever Been Interrupted? Which Day is the Day of Rest? What Is the First Day of the Week? What Is the Week Number? How can I calculate the week number? Do Weeks of Different Lengths Exist? What day was a certain date? Contemporary Mask. Mexico. Since time immemorial, the sun and the moon have inspired artists. Incan field workers would chant, "The sun rains gold, the moon rains silver." In art, the warm, golden sun is often depicted as male, while the cool, silver moon is portrayed as female. What Is the Origin of the 7-Day Week? Digging into the history of the 7-day week is a very complicated ... http://www.webexhibits.org/calendars/week.html · 20.1k |
The Christian Calendar - Easter | 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... Prayer Tower (detail). Pittsburg, Texas, USA This stained glass window from Witness Park and the Prayer Tower in Pittsburg, Texas, depicts the crucifixion of Jesus Christ on Good Friday, two days before His Resurrection on Easter Sunday. What is Easter? When is Easter? (Short answer) When is Easter? (Long answer) What is the Golden Number? How does one calculate Easter then? What is the Epact? How does one calculate Gregorian Easter? Isn’t there a simpler way to calculate Easter? Isn’t there an even simpler way to calculate Easter? Is there a simple relationship between two consecutive Easters? How frequently are the dates for Easter repeated? What about Greek Orthodox Easter? Will the Easter dates change after 2001? What is Easter? In the Christian world, Easter (and the days immediately preceding it) is ... http://www.webexhibits.org/calendars/calendar-christian-easter.html · 27.8k |
Museum Store | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Introduction Credits Books Museum Store Citations A page from the "Calendars" exhibit... (see also Books, and credits) We are often asked about cool calendar-related things we might recommend. The following items relate to calendars and our solar system. Items purchased through these links, as well as through the recommended books, help support WebExhibits. Calendars Calendars can be more than utilitarian; they’re a fun way to express your interests or personality while still keeping track of the days. Whether for yourself or as a gift for a friend, family member, or coworker, the perfect calendar will bring a smile to your face every day of the year – and support WebExhibits in the process. See calendars at Amazon.com Globes of the Earth... In an age where Google Earth and MapQuest make it seem as though the earth’s landmasses and oceans are a click away, traditional globes may seem quaint. Yet spinning a globe fuels flights of imagination, conjures up ... http://www.webexhibits.org/calendars/museumstore.html · 16.9k |
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 |
Credits | Calendars Calendars exhibit Webexhibit Home Node view Years & months Various Calendars Our Week Timeline About Introduction Credits Books Museum Store Citations A page from the "Calendars" exhibit... (see also books, and Museum store) Key contributor The primary contributor is Claus Tøndering, based in Denmark, who first published his Calendar FAQ in 1997. This novel document used the then-new "Frequently Asked Questions" style of writing to explain the otherwise complex working of calendars in an inviting and understandable way. Since then, he has published several editions online, adding his own research and improvements from other contributors. Other text credits The Maya calendar was compiled by Claus Tøndering based on information from Chris Carrier. Various texts, including the background on our year, the introduction to the Calendars section, the Indian calendar, and the history of the Chinese calendar are adapted from L. E. Dogget. Explanatory Supplement to the Astronomical Almanac, P. Kenneth Seidelmann, editor, with permission from University Science Books, ... http://www.webexhibits.org/calendars/credits.html · 20.5k |
Earth shadow | Causes of Color font size: a a a Related pages: Blue or black sky? Blue & red Earth shadow Mars Blue eyes Do it yourself A page from the "Causes of Color" exhibit... What causes layers in the sunrise and sunset? While it is stunning - and a bit eerie - to watch the earth’s shadow slowly blot out the moon during a lunar eclipse, we can actually see the earth’s shadow twice a day: in the eastern sky as the sun sets and in the western sky as the sun rises. Earth shadow is cast by the earth, with the atmosphere as the backdrop. In this schematic view, the photographer is facing away from the sun, towards to sunset or sunrise. The earth’s shadow can be seen at twilight and sunrise most days, but it is not always blue. Earth shadow during sunrise, a half hour before sunrise in Kitt’s Peak, Arizona. At sunrise (7:15 am), the white arrow on the bottom is the shadow cast by Kitt’s Peak. Earth shadow viewed from over the wing of an airplane in the Caribbean. The sun is setting to the left side of the photo. The dark wedge along the horizon, which thickens to the right, is the earth shadow. ... http://www.webexhibits.org/causesofcolor/14E.html · 19.1k |
A Variety Of 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... Old Wall Calendar in Farmhouse A calendar from 1925, yellowed with age, still hangs on the wall of retired farmer and recluse Theron Boyd’s house. Today almost everyone takes the precision of our calendars for granted, unaware of the long threads spooling out from our clocks and watches backward in time, running through virtually every major revolution in human science, all linked to the measurement of time. The thread runs largely through the West, since this is the source of the world’s civic calendar, but also casts lines of varying sizes and thickness outward to China, India, Egypt, Arabia, and Mesopotamia. Unwinding backward, it pauses at Clavious and at Bacon; at the rush of knowledge coming from Islam and the East during the Middle Ages; at bloody wars fought over dates after Rome’s collapse; and at Rome at its ... http://www.webexhibits.org/calendars/calendar.html · 9.3k |
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 |
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