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The epact (Latin: epactae, from Ancient Greek: ἐπακται ἡμεραι (epaktai hēmerai) = added days) used to be described by medieval computists as the age of a phase of the Moon in days on 22 March;[1] in the newer Gregorian calendar, however, the epact is reckoned as the age of the ecclesiastical moon on 1 January.[2] Its principal use is in determining the date of Easter by computistical methods. It varies (usually by 11 days) from year to year, because of the difference between the solar year of 365–366 days and the lunar year of 354–355 days.[3]
^Bede the Venerable (1999) [725], "Lunar Epacts", The Reckoning of Time, Translated Texts for Historians, vol. 29, translated by Wallis, Faith, Liverpool: Liverpool University Press, p. 131, ISBN 0-85323-693-3, The epacts noted in the 19-year cycle specifically stand for the age of the moon on the 11th kalends of April [22 March], the beginning of the Paschal feast.
^Richards, E. G. (2012), "Calendars" (PDF), in Urban, S. E.; Seidelman, P. K. (eds.), Explanatory Supplement to the Astronomical Almanac, Mill Valley, CA: University Science Books, pp. 599–601, ISBN 978-1-891389-85-6, archived from the original (PDF) on 2019-04-30, retrieved 2017-01-24, The Epact of a year … is the age in days (0 to 29) of the ecclesiastical moon on the first day of the year (January 1).
^Latin text and French translation of the Second Canon of the Gregorian calendar
The epact (Latin: epactae, from Ancient Greek: ἐπακται ἡμεραι (epaktai hēmerai) = added days) used to be described by medieval computists as the age of...
the epacts discussed above, it effectively used a single epact table starting with an epact of 0, which was never corrected. In this case, the epact was...
ePACT Network is an online emergency network. Users build networks of family, friends, and organizations, store and exchange information and access web...
(Latin for 'leap of the moon') – which causes the epacts to repeat every 19 years. When the epact reaches 30 or higher, an intercalary month is added...
Coptic Epact Numbers is a Unicode block containing Old Coptic number forms. These numbers were used in some regions instead of letters of the Coptic alphabet...
synchronized with the moon. Solar System portal List of calendars Lunar phase Epact Paschal Full Moon Iran operates Solar Hijri calendar, which is purely solar...
Mosshammer 2008, p. 76: "Theoretically, the epact 30=0 represents the new moon in conjunction with the sun. The epact of 1 represents the theoretical first...
of nulla or of nihil (the Latin word for "nothing") for 0, in a table of epacts, all written in Roman numerals. The use of N to indicate "none" long survived...
is reflected by the structure of its 19-year periodic sequence of epacts. The epact, since it originally marked the new moon, was zero in all first decennovenal...
Julian Easter occurred before AD 311, at the first entry in a table of epacts as preserved in an Ethiopic document for the years 311 to 369, using a Ge'ez...
devised by the Calabrian doctor Aloysius Lilius (or Lilio) for adjusting the epacts of the Moon, and has been adopted by almost all Western Christians and by...
the Coptic alphabet to the BMP of the UCS Final Proposal to Encode Coptic Epact Numbers in ISO/IEC 1064 Copticsounds – a resource for the study of Coptic...
or equivalent (Arkansas, Indiana, Iowa, Tennessee) No code or code not EPAct compliant (Arizona, Colorado, Illinois, Maine, Michigan, Mississippi, Missouri...
Islamic (lunar Hijri) Julian Solar Hijri Astronomical Dominical letter Epact Equinox Intercalation Julian day Leap year Lunar Lunisolar Solar Solstice...
Grassley authored EPACT 1992, which created the federal wind energy tax credit. In 2005, Grassley authored the tax title of EPACT 2005 when he was chairman...
conservation in buildings and created efficiency standards for appliances. The EPAct directed the federal government to decrease energy consumption in federal...
characters for writing the Coptic language, introduced in Unicode 4.1 Coptic Epact Numbers, a block of Unicode characters for writing Coptic numerals Coptic...
renewable energy power plants compared to conventional power plants." EPACT '92 enacted the renewable electricity production tax credit (PTC). The PTC...
years. He also produced an original and practical scheme for adjusting the epacts of the Moon when calculating the annual date of Easter, solving a long-standing...
Islamic (lunar Hijri) Julian Solar Hijri Astronomical Dominical letter Epact Equinox Intercalation Julian day Leap year Lunar Lunisolar Solar Solstice...
division of a business, its tax department, and a firm specializing in EPAct 179D deductions needed to cooperate. IRS mandated software had to be used...
400-year cycle of the Gregorian calendar with respect to the week), the epact (the age of the Moon in days on a certain date), the dominical letter (used...
Islamic (lunar Hijri) Julian Solar Hijri Astronomical Dominical letter Epact Equinox Intercalation Julian day Leap year Lunar Lunisolar Solar Solstice...
the age of the moon, the phases of the moon and the metonic cycle and the epact. This dial shows the difference in minutes between the apparent solar time...
customarily used in geography to change the scale of maps. "Reduction Compass". Epact. Museum of the History of Science, Oxford. Retrieved 10 January 2022. "Reduction...
chronology, and thus avoided the usually required terms of golden number, epact, solar cycle, domenical letter, and any religious connotations. Biographers...
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