- Archaeoastronomy, Anthropology, Archaeology, Classics, Cultural Theory, History, and 27 moreHumanities, Physics, Archaeological Science, Roman History, Egyptology, Egyptian Archaeology, Megalithic Monuments, Galaxy Formation and Evolution, TRB culture, Simulations of galaxy formation, Fundamental plane, Disk Galaxy Rotation Dark Matter, Religion, Culture, Church History, Mediterranean archaeology, Ritual, Iron Age, Astronomy, Astrophysics, Archaeoastronomy, Cultural Astronomy, Archaeoastronomy SEAC, Landscape Archaeology, Ancient Near East, Celtic Studies, Cultural Astronomy, and Phoenician Punic Archaeologyedit
Seminar at the Institute of Heritage Sciences (Incipit, Spain) about the celestial relations on the orientation and location of megalithic monuments in Spain and Beyond. Talk delivered in Spanish.
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¿Cuál es la orientación de las Iglesias cristianas?¿Necesitan estar orientadas de alguna manera? ¿Se cumple esa necesidad?¿Cómo?¿Reflejan las orientaciones diferentes eventos de la vida política y religiosa? En principio, para ir... more
¿Cuál es la orientación de las Iglesias cristianas?¿Necesitan estar orientadas de alguna manera? ¿Se cumple esa necesidad?¿Cómo?¿Reflejan las orientaciones diferentes eventos de la vida política y religiosa? En principio, para ir respondiendo a todos estos interrogantes me centraré en la información textual, en lo que nos dicen los cánones eclesiasticos sobre cómo se deberían orientar las iglesias de forma que el sacerdote y los fieles recen en la dirección adecuada. Este repaso nos llevará desde el comienzo de la Iglesia en los siglos III y IV hasta la Edad Media. Luego repasaré los trabajos que se han realizado para estudiar la orientación en Europa y en la Península Ibérica. Finalmente trataré dos casos particulares que son ilustrativos de cómo la orientación de las iglesias y la cristianización del paisaje reflejan eventos que ocurren en distintas épocas del a historia en la Península Ibérica.
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RESUMEN La orientación de las iglesias cristianas es un elemento distintivo de su arquitectura que repite patrones desde época paleocristiana. Existe una tendencia general a orientar sus ábsides en el rango solar, con una predilección de... more
RESUMEN La orientación de las iglesias cristianas es un elemento distintivo de su arquitectura que repite patrones desde época paleocristiana. Existe una tendencia general a orientar sus ábsides en el rango solar, con una predilección de las orientaciones cercanas al este geográfico (equinoccio astronómico), aunque las alineaciones en sentido opuesto, con el ábside a poniente, si bien resultan excepcionales pues no siguen el patrón canónico, no son inusuales. El caso de las iglesias construidas en el noroeste de África antes de la llegada del Islam resulta paradigmático en este sentido y pudiera reflejar tradiciones anteriores. El Archipiélago canario representa el extremo occidental de esa koine cultural norteafricana, por lo que se ha considerado relevante abordar un estudio de un conjunto compacto de iglesias antiguas en alguna de las islas, eligiendo el de Lanzarote. Se ha medido la orientación de un total de 30 iglesias edificadas con anterioridad a 1810, así como algunos ejemplos más de época posterior. La muestra indica que se siguió un patrón de orientación determinante en la isla, pero al contrario que la norma encontrada hasta ahora en el resto del orbe cristiano, este prototipo es doble. Por un lado, aparece la representativa orientación a levante (o poniente), pero la muestra tiene además un patrón marcado de orientaciones hacia el norte-noreste exclusivo, por ahora, de Lanzarote. Se analiza el porqué de esta extraña regla, considerándose varias posibilidades desechadas en su mayoría. Encontramos que la explicación puede ser muy prosaica, de forma que, a veces, las necesidades terrenales resultan más relevantes y decisorias que las necesidades del culto. ABSTRACT The orientation of Christian churches is a well-known distinctive feature of their architecture. There is a general tendency to align their apses in the solar range, favoring orientations close to the east (astronomical equinox), although the alignments in the opposite direction, namely, with the apse towards the west, are not unusual. The case of the churches built in northwest Africa before the arrival of Islam is paradigmatic in this regard, and may reflect earlier traditions. The Canary Islands is the western end of this North African cultural koine, so we thought it would be relevant to study a compact set of old churches in one of the islands of the archipelago, choosing to start our project with Lanzarote. We have measured the
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Se muestran los resultados de la labor de medida de las orientaciones de los ábsides y cabeceras de 25 iglesias prerrománicas analizadas hasta el momento en Galicia. Si bien el trabajo es aun preliminar ya se pueden extraer un número de... more
Se muestran los resultados de la labor de medida de las orientaciones de los ábsides y cabeceras de 25 iglesias prerrománicas analizadas hasta el momento en Galicia. Si bien el trabajo es aun preliminar ya se pueden extraer un número de interesantes resultados y conclusiones. Las iglesias de nuestra muestra presentan características comunes a las de los templos de la misma época del resto de la Península. Aparece una tendencia generalizada a mostrar una orientación de la iglesia hacia puntos ligeramente hacia el norte respecto al equinoccio astronómico. Esta tendencia es consistente con un uso de la salida del sol el 25 de Marzo para la época de construcción como guía para tal fin. Un caso paradigmático de tal uso y de su pervivencia en el tiempo puede ser la propia catedral de Santiago. Existen excepciones a tal regla, siendo las más características la presencia de orientaciones a poniente entre las iglesias identificadas como las más antiguas. Es interesante que en algún caso el uso de las orientaciones permite ratificar la posible conexión entre la iglesia de San Xes de Francelos con el grupo de iglesias asturianas.
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The orientation of Christian churches is a distinctive feature of its architecture, repeating patterns from early Christian times that show a general tendency to orientate their apses in the solar range, with a predilection for... more
The orientation of Christian churches is a distinctive feature of its
architecture, repeating patterns from early Christian times that show a general
tendency to orientate their apses in the solar range, with a predilection for orientations
near the astronomical equinox. We measured the orientation of a total of 167
churches built prior to A.D. 1086. A comprehensive statistical analysis of the
sample indicates a decisive orientation pattern, with a clear tendency to orientate
according to the standard tradition, albeit with certain particularities. Three subsamples
are examined to find the tendencies at each different historical time. This
exercise indicates that the main group of orientations seem to relate to the Canonical
equinox on 25 March, while popular ‘expected’ orientations, such as that of the
rising sun on the day of the patron saint of the church, are completely absent. Other
groups of orientations are specific to each period, such as that towards sunrise on
Saint James’s day, important only after the discovery of the saint’s tomb in the ninth
century.
architecture, repeating patterns from early Christian times that show a general
tendency to orientate their apses in the solar range, with a predilection for orientations
near the astronomical equinox. We measured the orientation of a total of 167
churches built prior to A.D. 1086. A comprehensive statistical analysis of the
sample indicates a decisive orientation pattern, with a clear tendency to orientate
according to the standard tradition, albeit with certain particularities. Three subsamples
are examined to find the tendencies at each different historical time. This
exercise indicates that the main group of orientations seem to relate to the Canonical
equinox on 25 March, while popular ‘expected’ orientations, such as that of the
rising sun on the day of the patron saint of the church, are completely absent. Other
groups of orientations are specific to each period, such as that towards sunrise on
Saint James’s day, important only after the discovery of the saint’s tomb in the ninth
century.
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Early-type dwarf galaxies are the most common type of galaxies observed in the Universe. The origin of this kind of systems is still not well understood. The aim of this paper is to investigate whether the different locations of dwarf... more
Early-type dwarf galaxies are the most common type of galaxies observed in the Universe. The origin of this kind of systems is still not well understood. The aim of this paper is to investigate whether the different locations of dwarf galaxies with respect to ellipticals in the face-on view of the fundamental plane could be due to the transformation of bright disc galaxies in low-mass systems by harassment. We have run high-resolution N-body numerical simulations to test the tidal stripping scenario of the dE galaxies. The present simulations modelled several individual tidal stripping events on initial disc-like galaxy models with different bulge-to-disc mass ratios. Tidal stripping is a very efficient mechanism for removing stars and dark matter particles from galaxies. The particles of the disc and halo components were easily stripped, while the bulge not. Thus, the scale length of the discs were 40-50% shorter than the initial ones. Prograde tidal interactions create tidal features like stable bars in the discs of the galaxies. After several tidal interactions the galaxy remnants looks like a dwarf spheroidal system. Simulated galaxies with initial large B/D ratios are closer to the face-on view of the fundamental plane defined by bright E and bulges of early-type galaxies. Nevertheless, galaxies with initial small B/D ratio are located, after four fast tidal encounters, at the position of dE galaxies in the face-on view of the fundamental plane. We conclude that fast galaxy-galaxy interactions are efficient mechanisms for transforming bright galaxies in dwarf ones. Indeed, the different location observed between Es and dEs in the face-on view of the fundamental plane can be explained by the formation of dwarf galaxies by harassment of late-type bright ones.
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Context: .Satellite accretion events have been invoked for mimicking the internal secular evolutionary processes of bulge growth. However, N-body simulations of satellite accretions have paid little attention to the evolution of bulge... more
Context: .Satellite accretion events have been invoked for mimicking the internal secular evolutionary processes of bulge growth. However, N-body simulations of satellite accretions have paid little attention to the evolution of bulge photometric parameters, to the processes driving this evolution, and to the consistency of this evolution with observations. Aims: .We want to investigate whether satellite accretions indeed drive the growth of bulges, and whether they are consistent with global scaling relations of bulges and discs. Methods: .We perform N-body models of the accretion of satellites onto disc galaxies. A Tully-Fisher (M∝ V_rotα_TF}) scaling between primary and satellite ensures that density ratios, critical to the outcome of the accretion, are realistic. We carry out a full structural, kinematic and dynamical analysis of the evolution of the bulge mass, bulge central concentration, and bulge-to-disc scaling relations. Results: . The remnants of the accretion have bulge-disc structure. Both the bulge-to-disc ratio (B/D) and the Sérsic index (n) of the remnant bulge increase as a result of the accretion, with moderate final bulge Sérsic indices: n = 1.0 to 1.9. Bulge growth occurs no matter the fate of the secondary, which fully disrupts for α_TF=3 and partially survives to the remnant center for α_TF = 3.5 or 4. Global structural parameters evolve following trends similar to observations. We show that the dominant mechanism for bulge growth is the inward flow of material from the disc to the bulge region during the satellite decay. Conclusions: .The models confirm that the growth of the bulge out of disc material, a central ingredient of secular evolution models, may be triggered externally through satellite accretion.
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Modern kinematic diagnostics from high-S/N spectroscopy provide useful tests on the collisionless merger hypothesis for the formation of elliptical galaxies. Bender, Saglia & Gerhard (1994) show that the skewness of the line-of-sight... more
Modern kinematic diagnostics from high-S/N spectroscopy provide useful tests on the collisionless merger hypothesis for the formation of elliptical galaxies. Bender, Saglia & Gerhard (1994) show that the skewness of the line-of-sight velocity distributions (LOSVD) has opposite sign to the rotation velocity and follows a distinct pattern. Previous N-body experiments (Bendo & Barnes 2000, Naab & Burkert 2001) disagree as to whether the relation is reproduced by the models.
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We have run high resolution N-body models simulating the encounter of a dwarf galaxy with a bright elliptical galaxy. The dwarf absorbs orbital angular momentum and shows counter-rotating features in the external regions of the galaxy. To... more
We have run high resolution N-body models simulating the encounter of a dwarf galaxy with a bright elliptical galaxy. The dwarf absorbs orbital angular momentum and shows counter-rotating features in the external regions of the galaxy. To explain the core-envelope kinematic decoupling observed in some dwarf galaxies in high-density environments requires nearly head-on collisions and very little dark matter bound to the dwarf. These kinematic structures appear under rather restrictive conditions. As a consequence, in a cluster like Virgo ~1% of dwarf galaxies may present counter-rotation formed by harassment.
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We analyse the skewness of the line-of-sight velocity distributions in model elliptical galaxies built through collisionless galaxy mergers. We build the models using large N-body simulations of mergers between either two spiral or two... more
We analyse the skewness of the line-of-sight velocity distributions in model elliptical galaxies built through collisionless galaxy mergers. We build the models using large N-body simulations of mergers between either two spiral or two elliptical galaxies. Our aim is to investigate whether the observed ranges of skewness coefficient (h3) and the rotational support (V/sigma), as well as the anticorrelation between h3 and V, may be reproduced through collisionless mergers. Previous attempts using N-body simulations failed to reach V/sigma ~ 1-2 and corresponding high h3 values, which suggested that gas dynamics and ensuing star formation might be needed in order to explain the skewness properties of ellipticals through mergers. Here we show that high V/sigma and high h3 are reproduced in collisionless spiral-spiral mergers whenever a central bulge allows the discs to retain some of their original angular momentum during the merger. We also show that elliptical-elliptical mergers, unless merging from a high-angular momentum orbit, reproduce the strong skewness observed in non-rotating, giant, boxy ellipticals. The behaviour of the h3 coefficient therefore associates rapidly-rotating disky ellipticals to disc-disc mergers, and associates boxy, slowly-rotating giant ellipticals to elliptical-elliptical mergers, a framework generally consistent with the expectations of hierarchical galaxy formation.
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A lunar standstill, also named a lunistice in resonance of the solar ‘solstice’ (the Sun standing still), is the moment of the lunar month when the Moon is seen farthest north or south with respect to other positions of that particular... more
A lunar standstill, also named a lunistice in resonance of the solar ‘solstice’ (the Sun standing still), is the moment of the lunar month when the Moon is seen farthest north or south with respect to other positions of that particular swinging motion from a given position on Earth. As Lionel Sims indicates in his paper, these extremes are not completely fixed, due to the receding motion of the line of nodes, and thus, the extremes vary between a major and a minor extreme in an 18.6-year period (or 9.3 years if we take the period between a major and a minor extreme).
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Orientation studies have recently received considerable attention in the archaeological domain as a source of information that may shed light on a number of anthropological issues such as beliefs systems or landscape and territory... more
Orientation studies have recently received considerable attention in the archaeological domain as a source of information that may shed light on a number of anthropological issues such as beliefs systems or landscape and territory apprehension by past cultures. This is especially important in those cultural contexts, such as the ‘megalithic’ phenome-na, where there are no written additional sources (Hoskin, 2001; González-García and Belmonte, 2010). This is the case of the Hafit and Umm en Nar cultures that dominated the eastern corner of the Arabian Peninsula during the Chalcolithic and the Early Bronze Age (EBA, third millennium BC), in the so-called land of Magan (present day Oman and the Emirates). In a field campaign in January 2012 several ancient EBA necropolises of the region were visited and (when possible) measured in an attempt to shed some light on the orientation customs of these ancient people. This paper presents the data for about seventy monuments, and the first outcomes of the fieldwork show that certain customs were present in the data that are far from being easily understood. This is the first sys-tematic archaeoastronomical approach ever conducted in the Arabian Peninsula.
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This chapter presents a preliminary approach to the problem of royal tomb orientation in ancient Egypt from early dynastic mausoleums at the necropolis of Umm al Qab to the impressive subterranean chambers of the tombs at the Valley of... more
This chapter presents a preliminary approach to the problem of royal tomb orientation in ancient Egypt from early dynastic mausoleums at the necropolis of Umm al Qab to the impressive subterranean chambers of the tombs at the Valley of the Kings (Biban al Maluk) and beyond. This work clearly shows that a correct orientation of the monuments, from early mastabas to later hypogea, was mandatory and that the sjy played a highly relevant role in understanding of ancient Egyptian funerary monuments in most periods.
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Within the framework of the project Orientatio ad Sidera II, of the Spanish MICINN, the geographical, historical and anthropological context of a possible interest about the heavens by the Hittites has been scrutinized (González García &... more
Within the framework of the project Orientatio ad Sidera II, of the Spanish MICINN, the geographical, historical and anthropological context of a possible interest about the heavens by the Hittites has been scrutinized (González García & Belmonte 2011). Special care is devoted to analysing the Hittite religion within its Anatolian context, notably the solar cults and the festival calendar. Contemporaneous with the Egyptian New Kingdom, the inhabitants of the Hittite Empire and their masters, the kings of the land of Hatti, produced a most sophisticated society, heir to a long Anatolian cultural tradition lasting for several millenian, However, cultural astronomy studies in this area and particular period have been practically non-existent, altough preliminary analyses of some Hittie sites, such as Yazilikaya (Belmonte 2000: 89; Krupp 2005: 413) or Sarissa (Müller-Karpe, Müller-Karpe & Schrimpf 2009: 141), and of a few written sources had shown certain clues to a possible interest in the sky. It is not the aim of this short essay to produce a review on Hittie religion but rather to concentrate on those aspects of the cult that could ve of interest to our work. Thse are the solar, and other astral, divinites the sacred space and its administrators, the calendar of festivals -i.e., Hittite sacred time- and, finally, the dead cult and related spaces and topography. To our knowledge, this is the first project dedicated to cultural astronomy studies of the Hittite civilization. In this respect, we have abalysed in depht bibliographical sources, including some original texts. The importance of solar cults has been clearly emphasized, and certain hints on the Hittite sacred time have been established with a certain degree of certitude. This will be useful for a later comaprison with the data provided by the archaeoastronomical research.
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The possible astronomical or topographical orientations of Hittite monuments have remained inexplored until recently. This would provide us with an importnat insight into how the temporality and sacred spaces were imprinted in the... more
The possible astronomical or topographical orientations of Hittite monuments have remained inexplored until recently. This would provide us with an importnat insight into how the temporality and sacred spaces were imprinted in the landscape by this culture, The analysis of a statistically significant sample of Hittite temples -and a few monumental gates- demonstrates that Hittite monuments were not ramdomly orientated as previously argued. On the contrary, there are well-defined patterns of orientation that can be interpreted within the context of Hittite culture and religion. This is the first intensive fieldwork dedicated to archaeastronomical studies of the Hittite culture. Our data confirm the textual evidence and show the relevance of solstitial and "equinoctial" orientations that could be explained within the context of Hittite solar cult. Indeed, Hattusa has shown a striking and highly interesting astronomical and topographical landscape, where potential relationship between astronomical phenomena, built structures such as temples and monumental gates, and different elements of the local landscape can be observed. Our intention has been to put archaeoastronomy on the correct footing it deserves within Hittitological studies.
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The idea of temporality and how this concept is introduced in the ritual domain could be investigated in past cultures through measurements of the orientation of cultic build-ings, provided that such orientations are linked with... more
The idea of temporality and how this concept is introduced in the ritual domain could be investigated in past cultures through measurements of the orientation of cultic build-ings, provided that such orientations are linked with particular astronomical events. Hel-lenic societies, among those of the Mediterranean Iron Age, had a need to regulate time through a calendar. The orientation of Hellenic temples in present day Greece and the South of Italy have recently been shown to be somewhat dissimilar, despite the obvious cultural links. In the present paper we verify if the samples of orientations of Hellenic temples in five distinct geographic areas are consistent with each other from a statistical point of view. Then we compute the internal variability among these groups by compar-ing them with other samples of temples across the Mediterranean, both for the Iron and Bronze ages, in order also to find possible long duration effects on the orientation of tem-ples. Despite apparent discrepancies when directly comparing the Hellenic samples, a clear similarity among these groups of temples appear when we compare them with temples from other societies. Such comparison links closer the temples in Greece with those in Lycia and perhaps Cyrene, and the ones in Sicily with those of Magna Graecia. As a by-product, we find other possible concordances among sacred building orienta-tions across the Mediterranean that may deserve further exploration in the future.
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Despite the fact that ancient writings indicate a clear necessity to orient Roman towns according to the path of the sun (Hyginus Gromatius, Constitutio, 1), Le Gall (1975) in an early work made clear that there was no clear preferred... more
Despite the fact that ancient writings indicate a clear necessity to orient Roman towns according to the path of the sun (Hyginus Gromatius, Constitutio, 1), Le Gall (1975) in an early work made clear that there was no clear preferred orientation pattern. However, Le Gall’s analysis was done by taking into consideration a sparse number of Roman towns from widely different latitudes, ranging from England to Algeria. However, recent re-sults show that when a restricted geographic area is considered, some patterns of orienta-tion do arise (Magli 2008, González-García and Costa-Ferrer 2011). We present the pre-liminary results from a survey to obtain a statistically significant sample of the orienta-tion of Roman cities in Hispania. This region was where the greatest number of cities were founded in the western part of the Roman Empire, both during the Republic and the Empire (Laurence, Esmonde Cleary & Sears, 2011), and it provides a perfect test bed for ideas on the orientation of Roman towns. So far, we have measured 43 Roman settle-ments in Hispania, and we can already verify some of the ideas on how Roman towns were oriented. The orientation of Roman towns in Hispania do seem to follow an astro-nomical pattern, with certain directions perhaps connected to particularly important dates of the Roman calendar.
