On the Gregorian Revision of the Julian Calendar Jacques Dutka
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Ephemeris Time, D. H. Sadler, Occasional
EPHEMERIS TIME D. H. Sadler 1. Introduction. – At the eighth General Assembly of the International Astronomical Union, held in Rome in 1952 September, the following resolution was adopted: “It is recommended that, in all cases where the mean solar second is unsatisfactory as a unit of time by reason of its variability, the unit adopted should be the sidereal year at 1900.0; that the time reckoned in these units be designated “Ephemeris Time”; that the change of mean solar time to ephemeris time be accomplished by the following correction: ΔT = +24°.349 + 72s.318T + 29s.950T2 +1.82144 · B where T is reckoned in Julian centuries from 1900 January 0 Greenwich Mean Noon and B has the meaning given by Spencer Jones in Monthly Notices R.A.S., Vol. 99, 541, 1939; and that the above formula define also the second. No change is contemplated or recommended in the measure of Universal Time, nor in its definition.” The ultimate purpose of this article is to explain, in simple terms, the effect that the adoption of this resolution will have on spherical and dynamical astronomy and, in particular, on the ephemerides in the Nautical Almanac. It should be noted that, in accordance with another I.A.U. resolution, Ephemeris Time (E.T.) will not be introduced into the national ephemerides until 1960. Universal Time (U.T.), previously termed Greenwich Mean Time (G.M.T.), depends both on the rotation of the Earth on its axis and on the revolution of the Earth in its orbit round the Sun. There is now no doubt as to the variability, both short-term and long-term, of the rate of rotation of the Earth; U.T. -
Periodization: Who Needs It?
Periodization: Who Needs It? Now that we are into a new calendar year, it’s time to get serious about your training program for the upcoming year. Many cyclists use some sort of training plan. One of the common elements of any training plan is that it is broken into segments, called periods. ‘Periodization’ is the process of developing a training schedule which has varying periods of hard work leading to overload or over- reaching, followed by a recovery period. Typically the year (the macrocycle) is broken into several large cycles, called mesocycles. Joe Friel, author of the Cyclists Training Bible uses the following names for these mesocycles: Preparation, Base, Build, Peak, Race and Transition. The Build, Peak and Race periods may be multiple several times during the racing season. The type of training during each of these is different depending on the time of year. Each of these mesocycles may have one or more cycles of 3-5 week segments. For example, your base period may have three sets of 4 weeks where you build up mileage and intensity for three consecutive weeks and then take the fourth week easier to recover from the previous three hard weeks. The purpose of varying the intensity of your training with periods of rest and recovery is to allow you to reach a higher level of fitness than if you just rode at a steady workload throughout the year. It’s similar to doing intervals, but on a larger scale. Almost every cyclist does some sort of periodization in their training whether they realize it or not. -
Geological Timeline
Geological Timeline In this pack you will find information and activities to help your class grasp the concept of geological time, just how old our planet is, and just how young we, as a species, are. Planet Earth is 4,600 million years old. We all know this is very old indeed, but big numbers like this are always difficult to get your head around. The activities in this pack will help your class to make visual representations of the age of the Earth to help them get to grips with the timescales involved. Important EvEnts In thE Earth’s hIstory 4600 mya (million years ago) – Planet Earth formed. Dust left over from the birth of the sun clumped together to form planet Earth. The other planets in our solar system were also formed in this way at about the same time. 4500 mya – Earth’s core and crust formed. Dense metals sank to the centre of the Earth and formed the core, while the outside layer cooled and solidified to form the Earth’s crust. 4400 mya – The Earth’s first oceans formed. Water vapour was released into the Earth’s atmosphere by volcanism. It then cooled, fell back down as rain, and formed the Earth’s first oceans. Some water may also have been brought to Earth by comets and asteroids. 3850 mya – The first life appeared on Earth. It was very simple single-celled organisms. Exactly how life first arose is a mystery. 1500 mya – Oxygen began to accumulate in the Earth’s atmosphere. Oxygen is made by cyanobacteria (blue-green algae) as a product of photosynthesis. -
A Few Common Misconceptions in Historical Astronomy by Barry D
A Few Common Misconceptions in Historical Astronomy By Barry D. Malpas – Special to the Williams-Grand Canyon News – 2014 September Did Galileo Invent the Telescope? Credit for the invention of the telescope is given to the Dutch lens maker Johann Lippershey (ca. 1570- 1619) in the year 1608, who tried to market them as military devices to the Dutch Government. Galileo, hearing about the invention through his correspondences with other scientists in Europe, built his first telescope in one evening, during the fall of 1609. Galileo too recognized the military significance of the telescope, but he also compre- hended its scientific importance, applying it to the Moon and planets, hence expanding humankind's understanding of the Universe. This use advanced astronomy as a modern science and provided its most important research instrument. Has Polaris Always Been the North Star? As the Earth spins on its axis like a giant top, it also slowly wobbles like one, completing one cycle in a period of about 26,000 years. This circular wobble is known as Precession, and is the movement of the direction in the sky to where the Earth’s axis points. At present, it points very close to the star Polaris. However, 5,000 years ago when Stonehenge in England and the Great Pyramid at Giza, Egypt, were being constructed, the Earth’s north polar axis pointed to Thuban, a star in the constellation Draco. About 12,000 years from now the axis will circle its way around towards the bright star Vega, in the constellation Lyra. (Note both Thuban and Vega on the sky chart.) Was the Earth Considered Flat When Columbus Discovered the New World? This misconception was generally true for the unschooled masses, but not so for anyone who had received an education. -
The Impact of Using Gregorian Calendar Dates in Systems That Adapt Localization: in the Case of Ethiopia
IOSR Journal of Computer Engineering (IOSR-JCE) e-ISSN: 2278-0661,p-ISSN: 2278-8727, Volume 19, Issue 6, Ver. III (Nov - Dec 2017), PP 01-07 www.iosrjournals.org The impact of using Gregorian calendar dates in systems that adapt localization: In the case of Ethiopia Getnet Mossie Zeleke1, Metages Molla Gubena2 1,2Department of Information Technology, College of Technology, Debre Markos University, Ethiopia Abstract: Ethiopian calendar has 13 months in which 12 months have 30 days equal and the 13th month has 5 or 6 days length. Date is one of the inputs for web or desktop applications. Java Development Kit(JDK) and Joda- Time Date Time package have been used for date manipulation in java based applications developed for local use in Ethiopia. Besides, Gregorian calendar date time pickers have also been used in web applications. This leads the application developers not to fully adapt localization. To fill this gap we developed JavaScript Date Picker and date manipulator java package in Ethiopian calendar basis. The first product consists of Amharic week day and month names which enable users to pick Ethiopian date as an input in web applications. The second product is used to manipulate Ethiopian date in java desktop and web applications. In the package different methods are defined to perform date related activities such as date calculations, extraction of date element in a given date, presentation of date in different date formats like መስከረም 12, 2010 etc. Unlike other date time java packages, dealing with Ethiopian dates using our date package does not require date conversion. -
Survey of Microbial Composition And
The Proceedings of the International Conference on Creationism Volume 7 Article 11 2013 Survey of Microbial Composition and Mechanisms of Living Stromatolites of the Bahamas and Australia: Developing Criteria to Determine the Biogenicity of Fossil Stromatolites Georgia Purdom Answers in Genesis Andrew A. Snelling Answers in Genesis Follow this and additional works at: https://digitalcommons.cedarville.edu/icc_proceedings DigitalCommons@Cedarville provides a publication platform for fully open access journals, which means that all articles are available on the Internet to all users immediately upon publication. However, the opinions and sentiments expressed by the authors of articles published in our journals do not necessarily indicate the endorsement or reflect the views of DigitalCommons@Cedarville, the Centennial Library, or Cedarville University and its employees. The authors are solely responsible for the content of their work. Please address questions to [email protected]. Browse the contents of this volume of The Proceedings of the International Conference on Creationism. Recommended Citation Purdom, Georgia and Snelling, Andrew A. (2013) "Survey of Microbial Composition and Mechanisms of Living Stromatolites of the Bahamas and Australia: Developing Criteria to Determine the Biogenicity of Fossil Stromatolites," The Proceedings of the International Conference on Creationism: Vol. 7 , Article 11. Available at: https://digitalcommons.cedarville.edu/icc_proceedings/vol7/iss1/11 Proceedings of the Seventh International Conference on Creationism. Pittsburgh, PA: Creation Science Fellowship SURVEY OF MICROBIAL COMPOSITION AND MECHANISMS OF LIVING STROMATOLITES OF THE BAHAMAS AND AUSTRALIA: DEVELOPING CRITERIA TO DETERMINE THE BIOGENICITY OF FOSSIL STROMATOLITES Georgia Purdom, PhD, Answers in Genesis, P.O. Box 510, Hebron, KY, 41048 Andrew A. -
ON the RECONSTRUCTED MACEDONIAN and EGYPTIAN LUNAR CALENDARS Aus: Zeitschrift Für Papyrologie Und Epigraphik 119 (1997) 157-166
ALEXANDER JONES ON THE RECONSTRUCTED MACEDONIAN AND EGYPTIAN LUNAR CALENDARS aus: Zeitschrift für Papyrologie und Epigraphik 119 (1997) 157-166 © Dr. Rudolf Habelt GmbH, Bonn 2 Name 157 ON THE RECONSTRUCTED MACEDONIAN AND EGYPTIAN LUNAR CALENDARS Documentary sources from Hellenistic Egypt attest to the use of three calendrical systems: the Egyptian civil calendar, which employed years that invariably comprised 365 days (12 months of exactly 30 days plus 5 “epagomenal” days), an Egyptian cult calendar that employed some sort of lunar months, and a Macedonian calendar in which the months were again lunar.1 The regulation of the Egyptian civil calendar is thoroughly understood, to the extent that we can convert all complete dates in this calendar to their exact equivalents in the modern historian’s Julian calendar and vice versa. It has for some time been generally believed that we similarly know the principles of regulation of the two lunar calendars. First R. A. Parker reconstructed a calendrical scheme for the Egyptian lunar calendar that tied its months in a recurring 25-year cycle with the months of the civil calendar.2 Thereafter A. E. Samuel applied the same 25-year lunation cycle to the Macedonian calendar.3 Small modifications have subsequently been proposed to Samuel’s hypothesis concerning the time-lag between the beginnings of the Egyptian and Macedonian lunar months. The present article sets out to show that the documentary foundation for these reconstructed calendars is much less solid than is usually supposed. In the case of the Macedonian calendar, it turns out that the evidence adduced for the reconstructed scheme tells strongly against it. -
The Mathematics of the Chinese, Indian, Islamic and Gregorian Calendars
Heavenly Mathematics: The Mathematics of the Chinese, Indian, Islamic and Gregorian Calendars Helmer Aslaksen Department of Mathematics National University of Singapore [email protected] www.math.nus.edu.sg/aslaksen/ www.chinesecalendar.net 1 Public Holidays There are 11 public holidays in Singapore. Three of them are secular. 1. New Year’s Day 2. Labour Day 3. National Day The remaining eight cultural, racial or reli- gious holidays consist of two Chinese, two Muslim, two Indian and two Christian. 2 Cultural, Racial or Religious Holidays 1. Chinese New Year and day after 2. Good Friday 3. Vesak Day 4. Deepavali 5. Christmas Day 6. Hari Raya Puasa 7. Hari Raya Haji Listed in order, except for the Muslim hol- idays, which can occur anytime during the year. Christmas Day falls on a fixed date, but all the others move. 3 A Quick Course in Astronomy The Earth revolves counterclockwise around the Sun in an elliptical orbit. The Earth ro- tates counterclockwise around an axis that is tilted 23.5 degrees. March equinox June December solstice solstice September equinox E E N S N S W W June equi Dec June equi Dec sol sol sol sol Beijing Singapore In the northern hemisphere, the day will be longest at the June solstice and shortest at the December solstice. At the two equinoxes day and night will be equally long. The equi- noxes and solstices are called the seasonal markers. 4 The Year The tropical year (or solar year) is the time from one March equinox to the next. The mean value is 365.2422 days. -
Islamic Calendar from Wikipedia, the Free Encyclopedia
Islamic calendar From Wikipedia, the free encyclopedia -at اﻟﺘﻘﻮﻳﻢ اﻟﻬﺠﺮي :The Islamic, Muslim, or Hijri calendar (Arabic taqwīm al-hijrī) is a lunar calendar consisting of 12 months in a year of 354 or 355 days. It is used (often alongside the Gregorian calendar) to date events in many Muslim countries. It is also used by Muslims to determine the proper days of Islamic holidays and rituals, such as the annual period of fasting and the proper time for the pilgrimage to Mecca. The Islamic calendar employs the Hijri era whose epoch was Islamic Calendar stamp issued at King retrospectively established as the Islamic New Year of AD 622. During Khaled airport (10 Rajab 1428 / 24 July that year, Muhammad and his followers migrated from Mecca to 2007) Yathrib (now Medina) and established the first Muslim community (ummah), an event commemorated as the Hijra. In the West, dates in this era are usually denoted AH (Latin: Anno Hegirae, "in the year of the Hijra") in parallel with the Christian (AD) and Jewish eras (AM). In Muslim countries, it is also sometimes denoted as H[1] from its Arabic form ( [In English, years prior to the Hijra are reckoned as BH ("Before the Hijra").[2 .(ﻫـ abbreviated , َﺳﻨﺔ ﻫِ ْﺠﺮﻳّﺔ The current Islamic year is 1438 AH. In the Gregorian calendar, 1438 AH runs from approximately 3 October 2016 to 21 September 2017.[3] Contents 1 Months 1.1 Length of months 2 Days of the week 3 History 3.1 Pre-Islamic calendar 3.2 Prohibiting Nasī’ 4 Year numbering 5 Astronomical considerations 6 Theological considerations 7 Astronomical -
Downloading the Application Form at the Following Address
Hanno Collaborato A queSto NumeRo: IL NUOVO SAGGIATORE f. K. A. Allotey, L. Belloni, BOLLETTINO DELLA SOCIETÀ ITALIANA DI FISICA G. Benedek, A. Bettini, t. m. Brown, Nuova Serie Anno 26 • N. 5 settembre-ottobre 2010 • N. 6 novembre-dicembre 2010 f. Brunetti, G. Caglioti, R. Camuffo, A. Cammelli, e. Chiavassa, DIRETTORE RESPONSABILE ViCeDiRettoRi ComitAto scieNtifiCo L. Cifarelli, e. De Sanctis, A. Di Carlo, Luisa Cifarelli Sergio focardi G. Benedek, A. Bettini, i. Di Giovanni, R. fazio, f. ferrari, Giuseppe Grosso S. Centro, e. De Sanctis, S. focardi, R. Gatto, A. Gemma, e. iarocci, i. ortalli, L. Grodzins, G. Grosso, f. Guerra, f. Palmonari, R. Petronzio, f. iachello, W. Kininmonth, e. Longo, P. Picchi, B. Preziosi S. mancini, P. mazzoldi, A. oleandri, G. onida, V. Paticchio, f. Pedrielli, A. Reale, G. C. Righini, N. Robotti, W. Shea, i. talmi, A. tomadin, m. Zannoni, A. Zichichi Sommario 3 EDITORIALE / EDITORIAL 84 50 anni di laser. Tavola rotonda al XCVI Congresso Nazionale della SIF SCieNZA iN PRimO PIANO G. C. Righini 5 Quantum simulators and 86 Assemblea di ratifica delle elezioni quantum design delle cariche sociali della SIF per il R. fazio, A. tomadin triennio 2011-2013 10 La rivoluzione della plastica nel 87 African Physical Society settore fotovoltaico f. K. A. Allotey A. Di Carlo, A. Reale, t. m. Brown, 90 Nicola Cabibbo and his role in f. Brunetti elementary-particle theory Percorsi R. Gatto 23 The tabletop measurement of the News helicity of the neutrino 92 The Italian graduate profile survey L. Grodzins A. Cammelli 30 Giulio Racah (1909-1965): 96 Premio Fermi 2010 modern spectroscopy A. -
The Milesian Calendar in Short
The Milesian calendar in short Quick description The Milesian calendar is a solar calendar, with weighted months, in phase with seasons. It enables you to understand and take control of the Earth’s time. The next picture represents the Milesian calendar with the mean solstices and equinoxes. Leap days The leap day is the last day of the year, it is 31 12m or 12m 31 (whether you use British or American English). This day comes just before a leap year. Years The Milesian years are numbered as the Gregorian ones. However, they begin 10 or 11 days earlier. 1 Firstem Y (1 1m Y) corresponds to 21 December Y-1 when Y is a common year, like 2019. But it falls on 22 December Y-1 when Y is a leap year like 2020. The mapping between Milesian and Gregorian dates is shifted by one for 71 days during “leap winters”, i.e. from 31 Twelfthem to 9 Thirdem. 10 Thirdem always falls on 1 March, and each following Milesian date always falls on a same Gregorian date. Miletus S.A.R.L. – 32 avenue Théophile Gautier – 75016 Paris RCS Paris 750 073 041 – Siret 750 073 041 00014 – APE 7022Z Date conversion with the Gregorian calendar The first day of a Milesian month generally falls on 22 of the preceding Gregorian month, e.g.: 1 Fourthem (1 4m) falls on 22 March, 1 Fifthem (1 5m) on 22 April etc. However: • 1 Tenthem (1 10m) falls on 21 September; • 1 12m falls on 21 November; • 1 1m of year Y falls on 21 December Y-1 if Y is a common year, but on 22 December if Y is a leap year; • 1 2m and 1 3m falls on 21 January and 21 February in leap years, 20 January and 20 February in common years. -
Calculation of Moon Phases and 24 Solar Terms
Calculation of Moon Phases and 24 Solar Terms Yuk Tung Liu (廖²棟) First draft: 2018-10-24, Last major revision: 2021-06-12 Chinese Versions: ³³³qqq---文文文 简简简SSS---文文文 This document explains the method used to compute the times of the moon phases and 24 solar terms. These times are important in the calculation of the Chinese calendar. See this page for an introduction to the 24 solar terms, and this page for an introduction to the Chinese calendar calculation. Computation of accurate times of moon phases and 24 solar terms is complicated, but today all the necessary resources are freely available. Anyone familiar with numerical computation and computer programming can follow the procedure outlined in this document to do the computation. Before stating the procedure, it is useful to have a basic understanding of the basic concepts behind the computation. I assume that readers are already familiar with the important astronomy concepts mentioned on this page. In Section 1, I briefly introduce the barycentric dynamical time (TDB) used in modern ephemerides, and its connection to terrestrial time (TT) and international atomic time (TAI). Readers who are not familiar with general relativity do not have to pay much attention to the formulas there. Section 2 introduces the various coordinate systems used in modern astronomy. Section 3 lists the formulas for computing the IAU 2006/2000A precession and nutation matrices. One important component in the computation of accurate times of moon phases and 24 solar terms is an accurate ephemeris of the Sun and Moon. I use the ephemerides developed by the Jet Propulsion Laboratory (JPL) for the computation.