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Tantrasaṅgraha, composed by the renowned Kerala astronomer Nc«lakaá¹tha Somayaji (c. 1444-1545 CE) ranks along with c€ryabhatc«ya of c€ryabhata and Siddhcntasiromani of Bhcskarcccrya as one of the major works that significantly influenced further work on astronomy in India. One of the distinguishing features of this text is the introduction of a major revision of the traditional planetary models which includes a unified theory of planetary latitudes and a better formulation of the equation of centre for the interior planets (Mercury and Venus) than was previously available. Several important innovations in mathematical technique are also to be found in Tantrasaṅgraha, especially related to the computation of accurate sine tables, the use of series for evaluating the sine and cosine functions, and a systematic treatment of the problems related to the diurnal motion of the celestial objects. The spherical trigonometry relations presented in the text applied to a variety of problems such as the computation eclipses, elevation of the moon's cusps and so forth are also exact. In preparing the translation and explanatory notes, the authors have used authentic Sanskrit editions of Tantrasaṅgraha by Suranad Kunjan Pillai and K V Sarma. The text consists of eight chapters mean londitudes, true longitues, gnomonic shadow, lunar eclipse, solar eclipse, vyatc«pcta, reduction to observation and elevation of the moon's cusps and 432 verses. All the verses have been translated into English and are supplemented with detailed explanations including all mathematical relations, figures and tables using modern mathematical notation. This edition of Tantrasaṅgraha will appeal to historians of astronomy as well as those who are keen to know about the actual computational procedures employed in Indian astronomy. It is a self-contained text with several appendices included, enabling the reader to comprehend the subject matter without the need for further research.

Astrophysics --- Astronomy --- astrofysica --- astronomie

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Astrophysics --- Astronomy --- astrofysica --- astronomie

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Genieten van de sterrenhemel is een unieke inleiding in de sterrenkunde voor iedereen die wel eens op een heldere avond de prachtige sterrenhemel bewondert. Rob Walrecht legt op een zeer duidelijke en boeiende manier de belangrijkste begrippen uit de sterrenkunde uit, met behulp van vele fraaie illustraties. Met een aanstekelijk enthousiasme voor de sterrenkunde laat hij de lezer het heelal ontdekken. Hoewel het boek vol staat met leuke feiten, zal de lezer er vooral begrip voor krijgen, begrip voor onze plek in het heelal. Genieten van de sterrenhemel is het eerste deel uit een serie. De volgende delen zijn Genieten van het zonnestelsel en Genieten van het heelal. Belangrijkste kenmerken van genieten van de sterrenhemel: * De meest uitgebreide uitleg over basisbegrippen uit de sterrenkunde zoals de dag, het jaar, de maanfasen, de seizoenen, de tijd die wij gebruiken en zelfs onze kalender. * Een verklaring van ALLE bewegingen aan de hemel die wij waarnemen. * Een duidelijke, logische opbouw, waardoor de lezer leert begrijpen wat onze plek is in het onvoorstelbaar grote heelal. * Het eerste boek dat ALLES vertelt over de planisfeer (draaibare sterrenkaart), zodat je dat unieke instrument leert begrijpen en gebruiken! * Een leuk en leerzaam programma per seizoen, om zelfs de sterrenhemel te bestuderen. * Bedoeld voor jong en oud (vanaf 12 jaar)

Cosmology --- Astrophysics --- heelal --- astronomie

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Per chi non è uno specialista nel campo non è facile capire a fondo i concetti della cosmologia moderna, che si basano sulla Relatività Generale e si intrecciano con le conquiste più recenti della fisica delle particelle. L'intento di questo libro è quello di riuscire ad addomesticare i tecnicismi e le astrazioni dei cosmologi così da offrirli alla comprensione di tutti. Il libro ripercorre l'evoluzione del pensiero cosmologico moderno, partendo da Herschel e passando per i lavori della Leavitt, di Shapley, Hubble, Friedmann, Lemâitre, Gamow fino all'affermazione del modello del Big Bang con l'inflazione e alla recente scoperta dell'energia oscura come motore dell'espansione cosmica accelerata.

Space research --- Cosmology --- Astrophysics --- Astronomy --- astrofysica --- ruimte (astronomie) --- astronomie --- kosmologie

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Scopo del testo e' introdurre i concetti base della fisica stellare, della fisica delle galassie e della cosmologia con approccio essenzialmente fisico. La prima parte presenta le tecniche osservative sia nella banda ottica, sia nelle alte frequenze e nella banda radio. La parte dedicata alle stelle discute modelli di struttura e l'evoluzione. La terza parte e' dedicata alle galassie, morfologia, formazione ed evoluzione, per giungere allo studio della distribuzione sulle grandi scale. La sezione di cosmologia presenta i modelli cosmologici relativistici, con la discussione del big-bang, inflazione, materia oscura, energia oscura. Il testo rappresenta la raccolta delle lezioni tenute dall'autore per i corsi introduttivi di astrofisica delle lauree specialistiche in Fisica e Astrofisica nei passati 30 anni, ma include elementi avanzati utili per corsi introduttivi di astrofisica nel dottorato in Fisica. Il testo e' anche stato utilizzato in forma preliminare da colleghi di altre sedi.

Space research --- Cosmology --- Astrophysics --- Astronomy --- astrofysica --- ruimte (astronomie) --- astronomie --- kosmologie