Dhruva the Ancient Indian Pole Star: Fixity, Rotation and Movement
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The Summer Sky by Dr
The Summer Sky by Dr. Whitney Shane, MIRA’s Charles Hitchcock Adams Fellow Fixed Stars Some years ago this column had occasion to discuss planetary nebulae, using the Ring Nebula in Lyra, everyone’s favorite, as an example. The simple morphology of the Ring Nebula makes it ideal for this purpose. It can be explained as a slightly ellipsoidal expanding shell, where the asym- metry is due to a slight anisotropy in the initial expansion velocity. Very few planetary nebulae have the simple structure of the Ring Nebula. In fact, there is a baffling variety in the shapes of these objects. Most of them, however, show symmetry about a plane, which we might identify with the equator of the central star. The expansion seems to take place mainly in the direction of the poles. This could be caused by the presence of a massive ring of material around the equator, which would direct the expansion toward the poles. This ring might have been left over from the giant phase of the star. This agreeable situa- tion came to an abrupt end when Hubble Space Telescope images of planetary nebulae, starting with the Cat’s Eye Nebula (NGC 6543), showed far more com- plex structures than had been previously sus- pected. This complexity, particularly its fine detail, could not be ex- plained by the model of an equatorial ring direct- ing a general expansion toward the poles. Attempts to explain these structures seem to fall into two categories. The presence of a companion star would provide both the dy- namical perturbations and the symmetry plane (in this case the orbital plane) required by the observa- tions. -
Gerbert of Aurillac: Astronomy and Geometry in Tenth Century Europe
October 25, 2018 15:56 WSPC/INSTRUCTION FILE Sigismondi-Gerbert International Journal of Modern Physics: Conference Series c World Scientific Publishing Company GERBERT OF AURILLAC: ASTRONOMY AND GEOMETRY IN TENTH CENTURY EUROPE COSTANTINO SIGISMONDI Sapienza University of Rome, Physics Dept., and Galileo Ferraris Institute P.le Aldo Moro 5 Roma, 00185, Italy. e-mail: [email protected] University of Nice-Sophia Antipolis - Dept. Fizeau (France); IRSOL, Istituto Ricerche Solari di Locarno (Switzerland) Received 6 Feb 2012 Revised Day Month Year Gerbert of Aurillac was the most prominent personality of the tenth century: as- tronomer, organ builder and music theoretician, mathematician, philosopher, and finally pope with the name of Silvester II (999-1003). Gerbert introduced firstly the arabic num- bers in Europe, invented an abacus for speeding the calculations and found a rational approximation for the equilateral triangle area, in the letter to Adelbold here discussed. Gerbert described a semi-sphere to Constantine of Fleury with built-in sighting tubes, used for astronomical observations. The procedure to identify the star nearest to the North celestial pole is very accurate and still in use in the XII century, when Computa- trix was the name of Polaris. For didactical purposes the Polaris would have been precise enough and much less time consuming, but here Gerbert was clearly aligning a precise equatorial mount for a fixed instrument for accurate daytime observations. Through the sighting tubes it was possible to detect equinoxes and solstices by observing the Sun in the corresponding days. The horalogium of Magdeburg was probably a big and fixed- mount nocturlabe, always pointing the star near the celestial pole. -
THUBAN the Star Thuban in the Constellation Draco (The Dragon) Was the North Pole Star Some 5,000 Years Ago, When the Egyptians Were Building the Pyramids
STAR OF THE WEEK: THUBAN The star Thuban in the constellation Draco (the Dragon) was the North Pole Star some 5,000 years ago, when the Egyptians were building the pyramids. Thuban is not a particularly bright star. At magnitude 3.7 and known as alpha draconis it is not even the brightest star in its constellation. What is Thuban’s connection with the pyramids of Egypt? Among the many mysteries surrounding Egypt’s pyramids are the so-called “air shafts” in the Great Pyramid of Giza. These narrow passageways were once thought to serve for ventilation as the The Great Pyramid of Giza, an enduring monument of ancient pyramids were being built. In the 1960s, though, Egypt. Egyptologists believe that it was built as a tomb for fourth dynasty Egyptian Pharaoh Khufu around 2560 BC the air shafts were recognized as being aligned with stars or areas of sky as the sky appeared for the pyramids’ builders 5,000 years ago. To this day, the purpose of all these passageways inside the Great Pyramid isn’t clear, although some might have been connected to rituals associated with the king’s ascension to the heavens. Whatever their purpose, the Great Pyramid of Giza reveals that its builders knew the starry skies intimately. They surely knew Thuban was their Pole Star, the point around which the heavens appeared to turn. Various sources claim that Thuban almost exactly pinpointed the position of the north celestial pole in the This diagram shows the so-called air shafts in the Great year 2787 B.C. -
The Dunhuang Chinese Sky: a Comprehensive Study of the Oldest Known Star Atlas
25/02/09JAHH/v4 1 THE DUNHUANG CHINESE SKY: A COMPREHENSIVE STUDY OF THE OLDEST KNOWN STAR ATLAS JEAN-MARC BONNET-BIDAUD Commissariat à l’Energie Atomique ,Centre de Saclay, F-91191 Gif-sur-Yvette, France E-mail: [email protected] FRANÇOISE PRADERIE Observatoire de Paris, 61 Avenue de l’Observatoire, F- 75014 Paris, France E-mail: [email protected] and SUSAN WHITFIELD The British Library, 96 Euston Road, London NW1 2DB, UK E-mail: [email protected] Abstract: This paper presents an analysis of the star atlas included in the medieval Chinese manuscript (Or.8210/S.3326), discovered in 1907 by the archaeologist Aurel Stein at the Silk Road town of Dunhuang and now held in the British Library. Although partially studied by a few Chinese scholars, it has never been fully displayed and discussed in the Western world. This set of sky maps (12 hour angle maps in quasi-cylindrical projection and a circumpolar map in azimuthal projection), displaying the full sky visible from the Northern hemisphere, is up to now the oldest complete preserved star atlas from any civilisation. It is also the first known pictorial representation of the quasi-totality of the Chinese constellations. This paper describes the history of the physical object – a roll of thin paper drawn with ink. We analyse the stellar content of each map (1339 stars, 257 asterisms) and the texts associated with the maps. We establish the precision with which the maps are drawn (1.5 to 4° for the brightest stars) and examine the type of projections used. -
Where Are the Distant Worlds? Star Maps
W here Are the Distant Worlds? Star Maps Abo ut the Activity Whe re are the distant worlds in the night sky? Use a star map to find constellations and to identify stars with extrasolar planets. (Northern Hemisphere only, naked eye) Topics Covered • How to find Constellations • Where we have found planets around other stars Participants Adults, teens, families with children 8 years and up If a school/youth group, 10 years and older 1 to 4 participants per map Materials Needed Location and Timing • Current month's Star Map for the Use this activity at a star party on a public (included) dark, clear night. Timing depends only • At least one set Planetary on how long you want to observe. Postcards with Key (included) • A small (red) flashlight • (Optional) Print list of Visible Stars with Planets (included) Included in This Packet Page Detailed Activity Description 2 Helpful Hints 4 Background Information 5 Planetary Postcards 7 Key Planetary Postcards 9 Star Maps 20 Visible Stars With Planets 33 © 2008 Astronomical Society of the Pacific www.astrosociety.org Copies for educational purposes are permitted. Additional astronomy activities can be found here: http://nightsky.jpl.nasa.gov Detailed Activity Description Leader’s Role Participants’ Roles (Anticipated) Introduction: To Ask: Who has heard that scientists have found planets around stars other than our own Sun? How many of these stars might you think have been found? Anyone ever see a star that has planets around it? (our own Sun, some may know of other stars) We can’t see the planets around other stars, but we can see the star. -
Chapter 3: Familiarizing Yourself with the Night Sky
Chapter 3: Familiarizing Yourself With the Night Sky Introduction People of ancient cultures viewed the sky as the inaccessible home of the gods. They observed the daily motion of the stars, and grouped them into patterns and images. They assigned stories to the stars, relating to themselves and their gods. They believed that human events and cycles were part of larger cosmic events and cycles. The night sky was part of the cycle. The steady progression of star patterns across the sky was related to the ebb and flow of the seasons, the cyclical migration of herds and hibernation of bears, the correct times to plant or harvest crops. Everywhere on Earth people watched and recorded this orderly and majestic celestial procession with writings and paintings, rock art, and rock and stone monuments or alignments. When the Great Pyramid in Egypt was constructed around 2650 BC, two shafts were built into it at an angle, running from the outside into the interior of the pyramid. The shafts coincide with the North-South passage of two stars important to the Egyptians: Thuban, the star closest to the North Pole at that time, and one of the stars of Orion’s belt. Orion was The Ishango Bone, thought to be a 20,000 year old associated with Osiris, one of the Egyptian gods of the lunar calendar underworld. The Bighorn Medicine Wheel in Wyoming, built by Plains Indians, consists of rocks in the shape of a large circle, with lines radiating from a central hub like the spokes of a bicycle wheel. -
9789004400139 Webready Con
Vedic Cosmology and Ethics Gonda Indological Studies Published Under the Auspices of the J. Gonda Foundation Royal Netherlands Academy of Arts and Sciences Edited by Peter C. Bisschop (Leiden) Editorial Board Hans T. Bakker (Groningen) Dominic D.S. Goodall (Paris/Pondicherry) Hans Harder (Heidelberg) Stephanie Jamison (Los Angeles) Ellen M. Raven (Leiden) Jonathan A. Silk (Leiden) volume 19 The titles published in this series are listed at brill.com/gis Vedic Cosmology and Ethics Selected Studies By Henk Bodewitz Edited by Dory Heilijgers Jan Houben Karel van Kooij LEIDEN | BOSTON This is an open access title distributed under the terms of the CC-BY-NC 4.0 License, which permits any non-commercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. Library of Congress Cataloging-in-Publication Data Names: Bodewitz, H. W., author. | Heilijgers-Seelen, Dorothea Maria, 1949- editor. Title: Vedic cosmology and ethics : selected studies / by Henk Bodewitz ; edited by Dory Heilijgers, Jan Houben, Karel van Kooij. Description: Boston : Brill, 2019. | Series: Gonda indological studies, ISSN 1382-3442 ; 19 | Includes bibliographical references and index. Identifiers: LCCN 2019013194 (print) | LCCN 2019021868 (ebook) | ISBN 9789004400139 (ebook) | ISBN 9789004398641 (hardback : alk. paper) Subjects: LCSH: Hindu cosmology. | Hinduism–Doctrines. | Hindu ethics. Classification: LCC B132.C67 (ebook) | LCC B132.C67 B63 2019 (print) | DDC 294.5/2–dc23 LC record available at https://lccn.loc.gov/2019013194 Typeface for the Latin, Greek, and Cyrillic scripts: “Brill”. See and download: brill.com/brill‑typeface. ISSN 1382-3442 ISBN 978-90-04-39864-1 (hardback) ISBN 978-90-04-40013-9 (e-book) Copyright 2019 by Henk Bodewitz. -
New Atmospheric Parameters and Spectral Interpolator for the MILES Cool Stars Kaushal Sharma1,2,3, Philippe Prugniel1,2, and Harinder P
A&A 585, A64 (2016) Astronomy DOI: 10.1051/0004-6361/201526111 & c ESO 2015 Astrophysics New atmospheric parameters and spectral interpolator for the MILES cool stars Kaushal Sharma1,2,3, Philippe Prugniel1,2, and Harinder P. Singh3,1,2 1 Université de Lyon, Université Lyon 1, 69622 Villeurbanne, France e-mail: [email protected] 2 CRAL, Observatoire de Lyon, CNRS UMR 5574, 69561 Saint-Genis Laval, France 3 Department of Physics and Astrophysics, University of Delhi, 110007 Delhi, India e-mail: [kaushal;hpsingh]@physics.du.ac.in Received 17 March 2015 / Accepted 18 October 2015 ABSTRACT Context. The full spectrum fitting of stellar spectra against a library of empirical spectra is a well-established approach to measure the atmospheric parameters of FGK stars with a high internal consistency. Extending it towards cooler stars still remains a challenge. Aims. We address this question by improving the interpolator of the Medium-resolution INT Library of Empirical Spectra (MILES) library in the low effective temperature regime (Teff < 4800 K), and we refine the determination of the parameters of the cool MILES stars. Methods. We use the ULySS package to determine the atmospheric parameters (Teff,logg and [Fe/H]), and measure the biases of the results with respect to our updated compilation of parameters calibrated against theoretical spectra. After correcting some systematic effects, we compute a new interpolator that we finally use to redetermine the atmospheric parameters homogeneously and assess the biases. Results. Based on an updated literature compilation, we determine Teff in a more accurate and unbiased manner compared to those determined with the original interpolator. -
Shiva's Waterfront Temples
Shiva’s Waterfront Temples: Reimagining the Sacred Architecture of India’s Deccan Region Subhashini Kaligotla Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Graduate School of Arts and Sciences COLUMBIA UNIVERSITY 2015 © 2015 Subhashini Kaligotla All rights reserved ABSTRACT Shiva’s Waterfront Temples: Reimagining the Sacred Architecture of India’s Deccan Region Subhashini Kaligotla This dissertation examines Deccan India’s earliest surviving stone constructions, which were founded during the 6th through the 8th centuries and are known for their unparalleled formal eclecticism. Whereas past scholarship explains their heterogeneous formal character as an organic outcome of the Deccan’s “borderland” location between north India and south India, my study challenges the very conceptualization of the Deccan temple within a binary taxonomy that recognizes only northern and southern temple types. Rejecting the passivity implied by the borderland metaphor, I emphasize the role of human agents—particularly architects and makers—in establishing a dialectic between the north Indian and the south Indian architectural systems in the Deccan’s built worlds and built spaces. Secondly, by adopting the Deccan temple cluster as an analytical category in its own right, the present work contributes to the still developing field of landscape studies of the premodern Deccan. I read traditional art-historical evidence—the built environment, sculpture, and stone and copperplate inscriptions—alongside discursive treatments of landscape cultures and phenomenological and experiential perspectives. As a result, I am able to present hitherto unexamined aspects of the cluster’s spatial arrangement: the interrelationships between structures and the ways those relationships influence ritual and processional movements, as well as the symbolic, locative, and organizing role played by water bodies. -
Winter Constellations
Winter Constellations *Orion *Canis Major *Monoceros *Canis Minor *Gemini *Auriga *Taurus *Eradinus *Lepus *Monoceros *Cancer *Lynx *Ursa Major *Ursa Minor *Draco *Camelopardalis *Cassiopeia *Cepheus *Andromeda *Perseus *Lacerta *Pegasus *Triangulum *Aries *Pisces *Cetus *Leo (rising) *Hydra (rising) *Canes Venatici (rising) Orion--Myth: Orion, the great hunter. In one myth, Orion boasted he would kill all the wild animals on the earth. But, the earth goddess Gaia, who was the protector of all animals, produced a gigantic scorpion, whose body was so heavily encased that Orion was unable to pierce through the armour, and was himself stung to death. His companion Artemis was greatly saddened and arranged for Orion to be immortalised among the stars. Scorpius, the scorpion, was placed on the opposite side of the sky so that Orion would never be hurt by it again. To this day, Orion is never seen in the sky at the same time as Scorpius. DSO’s ● ***M42 “Orion Nebula” (Neb) with Trapezium A stellar nursery where new stars are being born, perhaps a thousand stars. These are immense clouds of interstellar gas and dust collapse inward to form stars, mainly of ionized hydrogen which gives off the red glow so dominant, and also ionized greenish oxygen gas. The youngest stars may be less than 300,000 years old, even as young as 10,000 years old (compared to the Sun, 4.6 billion years old). 1300 ly. 1 ● *M43--(Neb) “De Marin’s Nebula” The star-forming “comma-shaped” region connected to the Orion Nebula. ● *M78--(Neb) Hard to see. A star-forming region connected to the Orion Nebula. -
Journal of Indian and Buddhist Studies, Vol. 49, No. 2
( 4) Journalof Indian and Buddhist Studies , Vol. 49, No. 2, March2001 King Prthu and His Genealogy Miwako KATO The story of king Prthu is often told to explain the origin of kingship . The following is the outline of the legend. Once there was a king named Vena, who was so impious that the sages slew him. Since he had no son, the sages churned the left hand of the wicked king . Then from the left hand came out a short and black barbarian Nisada. They then churned his right hand and great Prthu was born. Brahma consecrated him as the first king (adiraja), and in the midst of the ritual, two bards, Suta and Magadha were born to praise him. As a result of Vena's evil rule, people had been emaciated for want of food. In order to restore prosperity to them, taking up his bow and arrow, Prthu pursued the Earth who had assumed the form of a cow. Then the Earth begged for mercy and she entreated him to provide her with a calf so that she could give milk out of affection. After adopting Svayambhuva Manu as the calf, Prthu milked plants and vegetables from the Earth-cow on its own surface . Almost all of these elements occur in every version of the Prthu myth . Regarding his ancestor the texts differ from each other. That is, the texts of this story can be classified into three groups according to genealogical accounts of king Prthu. Some of the Puranns (P) such as the Harivamsa (H), Brahma-P. -
Draco the Dragon
Biblical Astronomer, number 100 51 DRACO THE DRAGON Gerardus D. Bouw, Ph.D. The embarrassment of dragons “Everyone knows it. Scientists have proven it dozens of times. Dragons are mythological; they never existed, leastwise, not while man roamed the earth. True, the ancient Chinese, Indians, Europeans, Amerin- dians, Africans, Australians, and others believed dragons existed in their time. They described dragons, told tales of killing them, and of the pesti- lences coming from dragons. But today we are much wiser and know that such ancient lore is nothing but myth. We are humanists, the measure of all things! We don’t need God. God is just a crutch for the feeble- minded, the weak. Today we know infinitely more than those grunting cave men. They and their dragon-infested Bible: bah!” “Hey!” a voice responds. “We’re not humanists. We believe in God, and we, too, know that dragons are mythological. Ignorant, supersti- tious men introduced the dragons into the Bible. We now have the correct interpretation for those problematic words. They’re not dragons but jack- als. We’re Bible critics, the measure of all things! We find out what God really meant to say but could not say plainly because of the cave-man mentality he had to address in His Word!” Now, that the author of this article totally disagrees with both the above statements let that be understood from the start. If that means being labeled feeble-minded, so be it. We think better of the ancients. Having studied their technology, we find them to be very clever and inventive, and we suspect that they could think circles around the aforementioned humanist and critical geniuses of today.