Astronomy and Architecture in the Maya Lowlands

2017 ◽  
Vol 2 (2) ◽  
pp. 189-215 ◽  
Author(s):  
Ivan Šprajc ◽  
Pedro Francisco Sánchez Nava
Keyword(s):  
Urban Planning ◽  
Cultural Landscape ◽  
Systematic Research ◽  
Agricultural Activities ◽  
Ancient Maya ◽  
Maya Lowlands ◽  
Maya Architecture ◽  
Orientation Group ◽  
Shed Light ◽  
Selection Of

This article summarises recent systematic research into the use and significance of astronomical orientations in ancient Maya architecture, and shows how by applying a more rigorous methodology to a large number of orientations we were able to detect alignment patterns that shed light on the validity of former hypotheses and provide a basis for novel interpretations. Our measurements and analysis confirm that orientations to the Sun’s position on the horizon, which largely prevail, allowed the use of observational calendars composed of multiples of 13 and 20 days and were also intended to facilitate proper scheduling of agricultural activities. Further, while some buildings recorded Venus extremes, a previously unknown orientation group has been found to refer to major lunar standstill positions. Some important buildings, aside from exhibiting astronomical orientations, are aligned to prominent features of natural or cultural landscape, implying a deliberate selection of these places for their construction. Discussing some relevant contextual evidence, we argue that Maya architectural and urban planning was dictated by a complex set of rules, in which astronomical considerations and their practical uses were embedded in a broader framework of cosmological concepts.

Approaches to Monumental Landscapes of the Ancient Maya

2020 ◽  
Keyword(s):  
Urban Planning ◽  
Scientific Research ◽  
Landscape Archaeology ◽  
Ancient Maya ◽  
Social Worlds ◽  
Human Occupation ◽  
Maya Lowlands ◽  
Sacred Landscapes ◽  
The Impact

Approaches to Monumental Landscapes of the Ancient Maya showcases interpretations and perspectives of landscape importance in the central Maya lowlands, Belize, and the northern and central Maya highlands with studies spanning over 10,000 years of human occupation in the region. Taking their cues from a robust scholarship on landscape archaeology, urban planning, political history, and settlement pattern studies in Maya research, the authors in this volume explore conceptions of monumentality and landscapes that are the products of long-term research and varied research agendas, falling into three broad conceptual categories: natural and built landscapes, political and economic landscapes, and ritual and sacred landscapes. The chapters explore the concept of monumentality in novel ways and approach the idea of landscape as not just the sum total of how a settlement’s local environs were plied and manipulated to conform to the Maya’s deep-seated and normative notions of sacred geography but also take note of how the lowland Maya actively constructed landscapes of power, meaning, and exchange, which rendered their social worlds imbricated, interdependent, and complex. Though varied in their approaches, the authors are all supported by the Alphawood Foundation, and this volume is a testament to the impact philanthropy can have on scientific research.

The Adult as Foe or Friend?: Childism in Guus Kuijer's Criticism and Fiction

2013 ◽  
Vol 6 (2) ◽  
pp. 205-217 ◽  
Author(s):  
Vanessa Joosen
Keyword(s):  
Children's Literature ◽  
Children’S Literature ◽  
Age Groups ◽  
Children's Books ◽  
Children’S Books ◽  
Memorial Award ◽  
Adult Reader ◽  
Shed Light ◽  
Selection Of

Compared to the attention that children's literature scholars have paid to the construction of childhood in children's literature and the role of adults as authors, mediators and readers of children's books, few researchers have made a systematic study of adults as characters in children's books. This article analyses the construction of adulthood in a selection of texts by the Dutch author and Astrid Lindgren Memorial Award winner Guus Kuijer and connects them with Elisabeth Young-Bruehl's recent concept of ‘childism’ – a form of prejudice targeted against children. Whereas Kuijer published a severe critique of adulthood in Het geminachte kind [The despised child] (1980), in his literary works he explores a variety of positions that adults can take towards children, with varying degrees of childist features. Such a systematic and comparative analysis of the way grown-ups are characterised in children's texts helps to shed light on a didactic potential that materialises in different adult subject positions. After all, not only literary and artistic aspects of children's literature may be aimed at the adult reader (as well as the child), but also the didactic aspect of children's books can cross over between different age groups.

Veiling Esther, Unveiling Her Story

2018 ◽  
Author(s):  
Adam J. Silverstein
Keyword(s):  
Nineteenth Century ◽  
Twentieth Century ◽  
Case Studies ◽  
Muslim World ◽  
Historical Narratives ◽  
Modern Times ◽  
Religious Background ◽  
Literary Context ◽  
Shed Light ◽  
Selection Of

This book examines the ways in which the biblical book of Esther was read, understood, and used in Muslim lands, from ancient to modern times. It zeroes-in on a selection of case studies, covering works from various periods and regions of the Muslim world, including the Qur’an, premodern historical chronicles and literary works, the writings of a nineteenth-century Shia feminist, a twentieth-century Iranian dictionary, and others. These case studies demonstrate that Muslim sources contain valuable materials on Esther, which shed light both on the Esther story itself and on the Muslim peoples and cultures that received it. The book argues that Muslim sources preserve important, pre-Islamic materials on Esther that have not survived elsewhere, some of which offer answers to ancient questions about Esther, such as the meaning of Haman’s epithet in the Greek versions of the story, the reason why Mordecai refused to prostrate himself before Haman, and the literary context of the “plot of the eunuchs” to kill the Persian king. Furthermore, throughout the book we will see how each author’s cultural and religious background influenced his or her understanding and retelling of the Esther story: In particular, it will be shown that Persian Muslims (and Jews) were often forced to reconcile or choose between the conflicting historical narratives provided by their religious and cultural heritages respectively.

scholarly journals Strain Accommodations among Twin Variants in Ti and Mg

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 453
Author(s):  
Ping Zhou ◽  
Guo-Zhen Zhu
Keyword(s):  
Mechanical Property ◽  
Great Influence ◽  
Local Strain ◽  
Deformation Texture ◽  
Variant Selection ◽  
Slip Systems ◽  
Twinning Shear ◽  
Active Variant ◽  
Shed Light ◽  
Selection Of

The selection of twin variants has a great influence on deformation texture and mechanical property in hcp metals where slip systems are limited and twinning types are abundant during deformation. Local strain accommodations among twin variants are considered to shed light on variant selection rules in Ti and Mg alloys. Five kinds of strain accommodations are discussed in terms of different regions that are affected by the twinning shear of primary twin. These regions contain (I) the whole sample, (II) neighboring grain, (III) adjacent primary twin in neighboring grain, (IV) adjoining primary twin within the same parent grain, and (V) multi-generation of twinning inside the primary twin. For a potentially active variant, its operation needs not only relatively higher resolved shear stress but also easily accommodated strain by immediate vicinity. Many of the non-Schmid behaviors could be elucidated by local strain accommodations that variants with relatively higher SFs hard to be accommodated are absent, while those with relatively lower SFs but could be easily accommodated are present.

The Chronology of Yaxuna

1998 ◽  
Vol 9 (1) ◽  
pp. 167-182 ◽  
Author(s):  
Charles Suhler ◽  
Traci Ardren ◽  
David Johnstone
Keyword(s):  
Cultural History ◽  
Cultural Development ◽  
The Political ◽  
Ancient Maya ◽  
Urban Center ◽  
Maya Lowlands ◽  
Terminal Classic ◽  
History Of ◽  
Late Formative ◽  
Middle Formative

AbstractResearch at the ancient Maya city of Yaxuna, located in the heart of the Yucatan Peninsula, has provided sufficient data to suggest a preliminary chronological framework for the cultural development of this large polity. Primary ceramic and stratigraphie data are presented to support a five-phase scheme of cultural history, encompassing the Middle Formative through Postclassic periods (500 b.c.–a.d. 1250). In addition to chronological significance, the political ramifications of a pan-lowland ceramic trade are addressed. Yaxuna experienced an early florescence in the Late Formative–Early Classic periods, when it was the largest urban center in the central peninsula. A second renaissance in the Terminal Classic period was the result of Yaxuna's role in an alliance between the Puuc and Coba, in opposition to growing Itza militancy. This paper proposes a chronological framework for the cultural development of one northern Maya region in order to facilitate an understanding of this area as part of the overall history of polity interaction and competition in the Maya lowlands.

Swamps, canals, and the locations of ancient Maya cities

Antiquity ◽  
1980 ◽  
Vol 54 (212) ◽  
pp. 206-214 ◽  
Author(s):  
R. E. W. Adams
Keyword(s):  
Radar Data ◽  
Classic Maya ◽  
Classic Period ◽  
Intensive Agriculture ◽  
Ancient Maya ◽  
Maya Lowlands ◽  
Rank Ordering ◽  
Topographic Information ◽  
Maya Civilization ◽  
Mapping Discovery

The recent radar mapping discovery of widely distributed patterns of intensive agriculture in the southern Maya lowlands provides new perspectives on classic Maya civilization. Swamps seem to have been drained, modified, and intensively cultivated in a large number of zones. The largest sites of Maya civilization are located on the edges of swamps. By combining radar data with topographic information, it is possible to suggest the reasons for the choice of urban locations. With the addition of patterns elicited from rank-ordering of Maya cities, it is also possible to suggest more accurate means of defining Classic period Maya polities.

Caves and Ancient Maya Ritual Use ofJute

2003 ◽  
Vol 14 (2) ◽  
pp. 207-219 ◽  
Author(s):  
Christina T. Halperin ◽  
Sergio Garza ◽  
Keith M. Prufer ◽  
James E. Bradya
Keyword(s):  
Religious Beliefs ◽  
Ancient Maya ◽  
Limited Data ◽  
Maya Lowlands ◽  
Freshwater Gastropods ◽  
Faunal Assemblages ◽  
Surface Sites ◽  
Ethnographic Data ◽  
Mother Earth ◽  
Ceremonial Architecture

AbstractA number of previous authors have suggested, based on limited data, thatPachychilusspp., freshwater gastropods often calledjute, may have played a role in ancient Maya ritual. Data collected by the authors demonstrate thatjuteshells consistently appear as part of faunal assemblages in ceremonial caves across the southern Maya Lowlands. At surface sites, jute are often associated with ceremonial architecture, particularly ballcourts. Previous ethnographic accounts are reviewed for clues to ancient Maya jute use. New ethnographic data suggest a role not previously considered by archaeologists. A Q‘eqchi’ Maya informant states that shells are gathered up after meals and deposited in caves as an offering in thanks to “Mother Earth” (Madre Tierra) who provided the mollusks. This practice suggests that the ancient shells may represent a secondary deposition rather than reflecting consumption occurring in the cave. The presence of jute shells may document ancient religious beliefs and ritual activities surrounding an important subsistence resource.

scholarly journals Isolated individuals and groups show opposite preferences toward humidity

2018 ◽  
Author(s):  
Mariano Calvo Martín ◽  
Stamatios C. Nicolis ◽  
Isaac Planas-Sitjà ◽  
Jean-Christophe de Biseau ◽  
Jean-Louis Deneubourg
Keyword(s):  
Relative Humidity ◽  
Environmental Conditions ◽  
Group Level ◽  
Individual Level ◽  
Negative Effect ◽  
Multi Level ◽  
The Individual ◽  
Shed Light ◽  
Selection Of

AbstractCockroaches, like most social arthropods, are led to choose collectively among different alternative resting places. These decisions are modulated by different factors, such as environmental conditions (temperature, relative humidity) and sociality (groups size, nature of communications). The aim of this study is to establish the interplay between environmental conditions and the modulation of the interactions between individuals within a group leading to an inversion of preferences. We show that the preferences of isolated cockroaches and groups of 16 individuals, on the selection of the relative humidity of a shelter are inversed and shed light on the mechanisms involved. We suggest that the relative humidity has a multi-level influence on cockroaches, manifested as an attractant effect at the individual level and as a negative effect at the group level, modulating the interactions.

scholarly journals In Pursuit of Adult Progenitors of Thymic Epithelial Cells

2021 ◽  
Vol 12 ◽  
Author(s):  
Tatsuya Ishikawa ◽  
Nobuko Akiyama ◽  
Taishin Akiyama
Keyword(s):  
T Cells ◽  
Epithelial Cells ◽  
Adaptive Immune System ◽  
Thymic Epithelial Cells ◽  
Adaptive Immune ◽  
Peripheral T Cells ◽  
Robust Adaptive ◽  
Adult Thymus ◽  
Shed Light ◽  
Selection Of

Peripheral T cells capable of discriminating between self and non-self antigens are major components of a robust adaptive immune system. The development of self-tolerant T cells is orchestrated by thymic epithelial cells (TECs), which are localized in the thymic cortex (cortical TECs, cTECs) and medulla (medullary TECs, mTECs). cTECs and mTECs are essential for differentiation, proliferation, and positive and negative selection of thymocytes. Recent advances in single-cell RNA-sequencing technology have revealed a previously unknown degree of TEC heterogeneity, but we still lack a clear picture of the identity of TEC progenitors in the adult thymus. In this review, we describe both earlier and recent findings that shed light on features of these elusive adult progenitors in the context of tissue homeostasis, as well as recovery from stress-induced thymic atrophy.

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