Calculating Planetary Cycles Using Geometry
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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. -
Alexander Jones Calendrica I: New Callippic Dates
ALEXANDER JONES CALENDRICA I: NEW CALLIPPIC DATES aus: Zeitschrift für Papyrologie und Epigraphik 129 (2000) 141–158 © Dr. Rudolf Habelt GmbH, Bonn 141 CALENDRICA I: NEW CALLIPPIC DATES 1. Introduction. Callippic dates are familiar to students of Greek chronology, even though up to the present they have been known to occur only in a single source, Ptolemy’s Almagest (c. A.D. 150).1 Ptolemy’s Callippic dates appear in the context of discussions of astronomical observations ranging from the early third century B.C. to the third quarter of the second century B.C. In the present article I will present new attestations of Callippic dates which extend the period of the known use of this system by almost two centuries, into the middle of the first century A.D. I also take the opportunity to attempt a fresh examination of what we can deduce about the Callippic calendar and its history, a topic that has lately been the subject of quite divergent treatments. The distinguishing mark of a Callippic date is the specification of the year by a numbered “period according to Callippus” and a year number within that period. Each Callippic period comprised 76 years, and year 1 of Callippic Period 1 began about midsummer of 330 B.C. It is an obvious, and very reasonable, supposition that this convention for counting years was instituted by Callippus, the fourth- century astronomer whose revisions of Eudoxus’ planetary theory are mentioned by Aristotle in Metaphysics Λ 1073b32–38, and who also is prominent among the authorities cited in astronomical weather calendars (parapegmata).2 The point of the cycles is that 76 years contain exactly four so-called Metonic cycles of 19 years. -
How Long Is a Year.Pdf
How Long Is A Year? Dr. Bryan Mendez Space Sciences Laboratory UC Berkeley Keeping Time The basic unit of time is a Day. Different starting points: • Sunrise, • Noon, • Sunset, • Midnight tied to the Sun’s motion. Universal Time uses midnight as the starting point of a day. Length: sunrise to sunrise, sunset to sunset? Day Noon to noon – The seasonal motion of the Sun changes its rise and set times, so sunrise to sunrise would be a variable measure. Noon to noon is far more constant. Noon: time of the Sun’s transit of the meridian Stellarium View and measure a day Day Aday is caused by Earth’s motion: spinning on an axis and orbiting around the Sun. Earth’s spin is very regular (daily variations on the order of a few milliseconds, due to internal rearrangement of Earth’s mass and external gravitational forces primarily from the Moon and Sun). Synodic Day Noon to noon = synodic or solar day (point 1 to 3). This is not the time for one complete spin of Earth (1 to 2). Because Earth also orbits at the same time as it is spinning, it takes a little extra time for the Sun to come back to noon after one complete spin. Because the orbit is elliptical, when Earth is closest to the Sun it is moving faster, and it takes longer to bring the Sun back around to noon. When Earth is farther it moves slower and it takes less time to rotate the Sun back to noon. Mean Solar Day is an average of the amount time it takes to go from noon to noon throughout an orbit = 24 Hours Real solar day varies by up to 30 seconds depending on the time of year. -
I. ASYMMETRY of ECLIPSES. CALENDAR CYCLES Igor Taganov & Ville-V.E
I. ASYMMETRY OF ECLIPSES. CALENDAR CYCLES Igor Taganov & Ville-V.E. Saari 1.1 Metaphysics of solar eclipses p. 12 1.2 Calendar cycles of solar eclipses p. 20 Literature p. 26 To describe the two main types of solar eclipses in modern astronomy the old Latin terms – umbra, antumbra and penumbra are still used (Fig. 1.1). A “partial eclipse” (c. 35 %) occurs when the Sun and Moon are not exactly in line and the Moon only partially obscures the Sun. The term “central eclipse” (c. 65 %) is often used as a generic term for eclipses when the Sun and Moon are exactly in line. The strict definition of a central eclipse is an eclipse, during which the central line of the Moon’s umbra touches the Earth’s surface. However, extremely rare the part of the Moon’s umbra intersects with Earth, producing an annular or total eclipse, but not its central line. Such event is called a “non-central” total or annular eclipse [2]. Fig. 1.1. Main types of solar eclipses The central solar eclipses are subdivided into three main groups: a “total eclipse” (c. 27 %) occurs when the dark silhouette of the Moon completely obscures the Sun; an “annular eclipse” (c. 33 %) occurs when the Sun and Moon are exactly in line, but the apparent size of the Moon is smaller than that of the Sun; a “hybrid eclipse” or annular/total eclipse (c. 5 %) at certain sites on the Earth’s surface appears as a total eclipse, whereas at other sites it looks as annular. -
Metonic Intercalations in Athens
METONIC INTERCALATIONSIN ATHENS ~W~7~JHENI published in 1940 the only knownAttic decreenaming in its preamble v v at least part of the name and demotic of the secretary of 298/7 I suggested that the calendar equation indicated an ordinary year of twelve months.' This deter- mination was taken over by Pritchett and Meritt in Chronology of Hellenistic Athens (p. xvi), by Pritchett and Neugebauer in Calendars of Athens (p. 80), and by Meritt in The Athenian Year (p. 232). There is one consideration which at the time did not seem so important as it does now and which I wish to discuss here. The incentive to a reconsideration has been the observation that the sequence of ordinary and intercalary years which called for OOIOI in 299/8-295/4 rather than OIOOI at the beginning of the 8th Metonic cycle was the first apparent deviation from Meton's norm for possibly a hundred years, except for the anomaly in 307/6 which had valid and obvious historical reasons and which could be amply explained.2 I noted, as a comment on the cycles, that " the eighth cycle has only the transposition of IO to OI in the years 298/7 and 297/6." 8 Otherwise the cycle in the festival calendar of Athens followed faithfully the normal Metonic cycle of intercalation. In the text of Hesperia, IX, 1940, pp. 80-83 (13), as now restored with a stoichedon line of 29 letters, the equation reads: [. 'EA..Xa0b],8oXt'v[o] sv6 [TE&per'] [ElKa6a& Tptp&et] Ka' eiKoo-xrre[&T2q irp] [VTlavea- -] - KTX. -
TM-71-2014-3 Moon on the Orbital Elements of a Lunar Satellite DATE-M~~~~29, 1971 FILING CASE NO(S)- 310 AUTROR(S)- A
D 955 LWEPIFANT PLAZA NORTH, S.W., WASHINGTON, D.C. 20024 TITLE- Effects of Physical Librations of the TM-71-2014-3 Moon on the Orbital Elements of a Lunar Satellite DATE-M~~~~29, 1971 FILING CASE NO(S)- 310 AUTROR(S)- A. J, Ferrari W. G. Heffron FILING SUBJECT(S) (ASSIGNED BY AUTHOR(S))- Moonl Selenodesy, PlanetaryI Librations ABSTRACT Physical librations of the moon, which cause seleno- graphic axes fixed in the true moon to have a different orientation than similar axes fixed in the mean moon, are small cyclic perturbations with periods of one month and longer, and amplitudes of 100 arc seconds or less. These librations have two types of effects of present interest. If the orbital elements of a lunar satellite are referred to selenographic axes in the true moon as it rotates and librates, then the librations cause changes in the orientation angles (node, inclination and periapsis argu- ment) large enough that long period planetary perturbation theory cannot be used without compensation for such geometri- cal effects. As a second effect, the gravitic potential of the moon is actually wobbled in inertial space, a condition not included in the potential expression used in planetary perturbation theory e The paper gives data on the magnitude of the physi- cal librations, the geometrical effects on the orbital elements and the equivalent changes in the coefficients in the potential. Fortunately, the last effect is shown to be small. U m SE E SI TM- 7 1- 2 014- 3 DI STRlBUTlON COMPLETE MEMORANDUM TO- COMPLETE MEMORANDUM TO Jet Propulsion Laboratory CORRESPONDENCE FILES P, Gottlieb/233-307 OFFICIAL FILE COPY J. -
The Calendars of India
The Calendars of India By Vinod K. Mishra, Ph.D. 1 Preface. 4 1. Introduction 5 2. Basic Astronomy behind the Calendars 8 2.1 Different Kinds of Days 8 2.2 Different Kinds of Months 9 2.2.1 Synodic Month 9 2.2.2 Sidereal Month 11 2.2.3 Anomalistic Month 12 2.2.4 Draconic Month 13 2.2.5 Tropical Month 15 2.2.6 Other Lunar Periodicities 15 2.3 Different Kinds of Years 16 2.3.1 Lunar Year 17 2.3.2 Tropical Year 18 2.3.3 Siderial Year 19 2.3.4 Anomalistic Year 19 2.4 Precession of Equinoxes 19 2.5 Nutation 21 2.6 Planetary Motions 22 3. Types of Calendars 22 3.1 Lunar Calendar: Structure 23 3.2 Lunar Calendar: Example 24 3.3 Solar Calendar: Structure 26 3.4 Solar Calendar: Examples 27 3.4.1 Julian Calendar 27 3.4.2 Gregorian Calendar 28 3.4.3 Pre-Islamic Egyptian Calendar 30 3.4.4 Iranian Calendar 31 3.5 Lunisolar calendars: Structure 32 3.5.1 Method of Cycles 32 3.5.2 Improvements over Metonic Cycle 34 3.5.3 A Mathematical Model for Intercalation 34 3.5.3 Intercalation in India 35 3.6 Lunisolar Calendars: Examples 36 3.6.1 Chinese Lunisolar Year 36 3.6.2 Pre-Christian Greek Lunisolar Year 37 3.6.3 Jewish Lunisolar Year 38 3.7 Non-Astronomical Calendars 38 4. Indian Calendars 42 4.1 Traditional (Siderial Solar) 42 4.2 National Reformed (Tropical Solar) 49 4.3 The Nānakshāhī Calendar (Tropical Solar) 51 4.5 Traditional Lunisolar Year 52 4.5 Traditional Lunisolar Year (vaisnava) 58 5. -
Metonic Moon Cycle – Meton Was a 5Th Century BC Greek Mathematician, Astronomer, and Engineer Known for His Work with the 19-Year "Metonic Cycle“
by Cayelin K Castell www.cayelincastell.com www.shamanicastrology.com The synodic cycle of the Moon or angular relationship with the Sun is the basic understanding of the other synodic cycles. Dane Rudhyar states in his book The Lunation Cycle that every whole is part of a bigger whole… Or is a Hologram The cyclic relationship of the Moon to the Sun produces the lunation cycle; and every moment of the month and day can be characterized significantly by its position within this lunation cycle. Dane Rudhyar The Lunation Cycle The Moon Phases occur due to the relationship of the Sun, Moon and Earth as seen from the Earth’s perspective. Eight Phases of the Moon New Moon Traditional Phase 0-44 degrees. Shamanic Phase 345 to 29 degrees -exact at Zero Degrees. Waxing Crescent Moon Traditional Phase 45-89 Shamanic Phase 30-74 degrees - exact at 60 degrees First Quarter Moon Traditional Phase 90-134 degrees Shamanic Phase 75-119 degrees - exact at 90 degrees Waxing Gibbous Moon Traditional Phase 135-179 Shamanic Phase 120-164 degrees - exact at 135 degrees Full Moon Traditional Phase 180-224 degrees Shamanic Phase 165-209 degrees – exact at 180 degrees Disseminating Moon Traditionally 225-269 degrees Shamanic 210-254 degrees - exact at 210 degrees Last Quarter Moon Traditionally 270-314 Shamanic 255-299 degrees - exact at 270 degrees Balsamic Moon Traditional phase 315-360 Shamanic Phase 300-345 degrees - exact at 315 degrees The Ancient System of the Hawaiian Moon Calendar and other cultures are based on direct observation. The Moon Phases are determined by what is actually seen from a specific location night to night. -
Analytical Model for the Tidal Evolution of the Evection 10.1029/2019JE006266 Resonance and the Timing of Resonance Escape Key Points: William R
RESEARCH ARTICLE Analytical Model for the Tidal Evolution of the Evection 10.1029/2019JE006266 Resonance and the Timing of Resonance Escape Key Points: William R. Ward1, Robin M. Canup1 , and Raluca Rufu1 • Capture of the Moon into the evection resonance with the Sun 1Planetary Science Directorate, Southwest Research Institute, Boulder, CO, USA transfers angular momentum from the Earth‐Moon to Earth's heliocentric orbit • Using the Mignard tidal model, we Abstract A high‐angular momentum giant impact with the Earth can produce a Moon with a silicate find that escape from evection isotopic composition nearly identical to that of Earth's mantle, consistent with observations of terrestrial occurs early with minimal angular and lunar rocks. However, such an event requires subsequent angular momentum removal for consistency momentum loss from the Earth‐Moon with the current Earth‐Moon system. The early Moon may have been captured into the evection resonance, • Processes beyond formal evection occurring when the lunar perigee precession period equals 1 year. It has been proposed that after a high‐ resonance are needed to reconcile a angular momentum giant impact, evection removed the angular momentum excess from the Earth‐Moon high‐angular momentum giant impact with the current Earth‐Moon pair and transferred it to Earth's orbit about the Sun. However, prior N‐body integrations suggest this result Supporting Information: depends on the tidal model and chosen tidal parameters. Here, we examine the Moon's encounter with • Supporting Information S1 evection using a complementary analytic description and the Mignard tidal model. While the Moon is in resonance, the lunar longitude of perigee librates, and if tidal evolution excites the libration amplitude Correspondence to: sufficiently, escape from resonance occurs. -
The Moon and Eclipses
The Moon and Eclipses ASTR 101 September 14, 2018 • Phases of the moon • Lunar month • Solar eclipses • Lunar eclipses • Eclipse seasons 1 Moon in the Sky An image of the Earth and the Moon taken from 1 million miles away. Diameter of Moon is about ¼ of the Earth. www.nasa.gov/feature/goddard/from-a-million-miles-away-nasa-camera-shows-moon-crossing-face-of-earth • Moonlight is reflected sunlight from the lunar surface. Moon reflects about 12% of the sunlight falling on it (ie. Moon’s albedo is 12%). • Dark features visible on the Moon are plains of old lava flows, formed by ancient volcanic eruptions – When Galileo looked at the Moon through his telescope, he thought those were Oceans, so he named them as Marias. – There is no water (or atmosphere) on the Moon, but still they are known as Maria – Through a telescope large number of craters, mountains and other geological features visible. 2 Moon Phases Sunlight Sunlight full moon New moon Sunlight Sunlight Quarter moon Crescent moon • Depending on relative positions of the Earth, the Sun and the Moon we see different amount of the illuminated surface of Moon. 3 Moon Phases first quarter waxing waxing gibbous crescent Orbit of the Moon Sunlight full moon new moon position on the orbit View from the Earth waning waning gibbous last crescent quarter 4 Sun Earthshine Moon light reflected from the Earth Earth in lunar sky is about 50 times brighter than the moon from Earth. “old moon" in the new moon's arms • Night (shadowed) side of the Moon is not completely dark. -
Lecture 2: Our Place in Space Copernican Principle Multiwavelength Astronomy
Lecture 2: Our Place in Space •It is now clear that Earth is not central or special in its general properties (mass, distance from central star, etc.) •The Sun is an average star •The Milky Way is a typical spiral galaxy •This leads to the “principle of mediocrity” or “Copernican principle” Copernican Principle •The “principle of mediocrity” or “Copernican principle” states that physical laws are the same throughout the Universe •This principle can be tested using the scientific method! •So far, it seems to agree with observations perfectly •One of the key ideas is that we can use light from distant objects to understand conditions there, using the work of Isaac Newton Multiwavelength Astronomy •The color and energy of light are related to the Wavelength… •Different wavelengths of radiation tell us about objects with different temperatures… 1 Multiwavelength Astronomy Multiwavelength Astronomy •Using Newton’s techniques, combined with our knowledge of atomic structure, we can use light to study distant objects… X-ray optical composition of matter temperature of matter Scientific Method and Observation •Transformed the search for meaning into a quest for objective truth •We can deduce the properties of distant objects using observations •The scientific method originated in the renaissance, and is still used today: hypo thesi n s io tti iic d e r y p y p r r o o e o truth e truth h b h t s t e rr v a tt ii o n test 2 Copernican Principle •The validity of the “Copernican principle” is great news for science, because it means that we can -
From Natural Philosophy to Natural Science: the Entrenchment of Newton's Ideal of Empirical Success
From Natural Philosophy to Natural Science: The Entrenchment of Newton's Ideal of Empirical Success Pierre J. Boulos Graduate Pro gram in Philosophy Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy Faculty of Graduate Studies The Universly of Western Ontario London, Ontario April 1999 O Pierre J- Boulos 1999 National Library Bibliotheque nationale of Canada du Canada Acquisitions and Acquisitions et Bibliographic Services services bibliographiques 395 Wellington Street 395, rue Wellington Ottawa ON KIA ON4 Ottawa ON KIA ON4 Canada Canada Your Me Voue reference Our file Notre rddrence The author has granted a non- L'auteur a accorde me licence non exclusive licence dowing the exclusive pennettant a la National Library of Canada to Bibliotheque nationale du Canada de reproduce, loan, distribute or sell reproduire, preter, distribuer ou copies of this thesis in microform, vendre des copies de cette these sous paper or electronic formats. la forme de microfiche/£ih, de reproduction sur papier ou sur format electronique. The author retains ownership of the L'auteur conserve la propriete du copyright in this thesis. Neither the droit d'auteur qui protege cette these. thesis nor substantial extracts &om it Ni la these ni des extraits substantieis may be printed or otherwise de celle-ci ne doivent Stre imprimes reproduced without the author's ou autrement reproduits sans son permission. autorisation. ABSTRACT William Harper has recently proposed that Newton's ideal of empirical success as exempli£ied in his deductions fiom phenomena informs the transition fiom natural philosophy to natural science. This dissertation examines a number of methodological themes arising fiom the Principia and that purport to exemplifjr Newton's ideal of empirical success.