RESPONSE TO SUGIYAMA, SUGIYAMA, AND SARABIA G.

2018 ◽  
Vol 29 (2) ◽  
pp. 401-402
Author(s):  
Rebecca Sload
Keyword(s):  
The Sun ◽  
Radiocarbon Dates ◽  
Ceramic Chronology

Contrary to Sugiyama et al., radiocarbon dates from the Sun Pyramid do not mean that the Pyramid was constructed later than current estimates, nor that the Teotihuacan ceramic chronology should be changed.

REVISITING SUN PYRAMID CERAMIC AND RADIOCARBON DATES FROM TEOTIHUACAN: COMMENT ON SLOAD

2018 ◽  
Vol 29 (2) ◽  
pp. 398-400
Author(s):  
Nawa Sugiyama ◽  
Saburo Sugiyama ◽  
Alejandro Sarabia G.
Keyword(s):  
The Sun ◽  
Radiocarbon Dates ◽  
Ceramic Chronology

Sload (2015) disregards stratigraphic data from the Sun Pyramid and misinterprets our radiocarbon dates that re-evaluates Teotihuacan ceramic chronology.

When was the Sun Pyramid Built? Maintaining the Status Quo at Teotihuacan, Mexico

2015 ◽  
Vol 26 (2) ◽  
pp. 221-241 ◽  
Author(s):  
Rebecca Sload
Keyword(s):  
Status Quo ◽  
First Century ◽  
Third Century ◽  
The Sun ◽  
Economic Implications ◽  
Radiocarbon Dates ◽  
Ceramic Chronology ◽  
The Status ◽  
The City ◽  
Teotihuacan Mexico

The traditional view based on ceramics is that construction of the Sun Pyramid at Teotihuacan commenced in the first century A .D. Likewise, radiocarbon dates from the artificial cave beneath the Pyramid indicate that it was created at about the same lime. Both Pyramid and cave are seen as having a role in the founding of the city. Recent excavation inside the Pyramid produced radiocarbon dates that cluster in the mid-third century A.D. Members of the Sun Pyramid Project interpreted the dates as representing initial construction of the structure, moving it significantly later in time than previously thought. They also reinterpreted the dates for the construction of the cave, making it contemporaneous with the revised Pyramid construction. This paper adds radiocarbon dates from the cave to the original set and employs Bayesian analysis. The initial interpretation is supported: the dates reflect a cycle of cave creation through termination that began in the midfirst century and lasted about 200 years. I interpret the dates from the Pyramid as reflecting ritual associated with cave termination and a concomitant redefinition of the Pyramid that involved architectural modifications and tunneling. Pyramid and cave dates are reconciled with each other, with ceramics, and with the ceramic chronology. The traditional timing of first century Pyramid construction is maintained, along with its social, political, and economic implications.

CERAMIC SEQUENCE, CHRONOLOGY, AND CULTURAL DYNAMICS OF THE UCAREO-ZINAPÉCUARO, MICHOACÁN OBSIDIAN SOURCE AREA

2021 ◽  
pp. 1-21
Author(s):  
Dan M. Healan ◽  
Christine Hernández
Keyword(s):  
Source Area ◽  
Central Mexico ◽  
Cultural Dynamics ◽  
Postclassic Period ◽  
Radiocarbon Dates ◽  
Pottery Analysis ◽  
Ceramic Chronology ◽  
Cross Dating ◽  
Obsidian Source

Abstract This article presents the ceramic sequence and chronology resulting from a multi-year program of survey, excavation, and analysis of pre-Hispanic settlement and exploitation within the Zinapécuaro-Ucareo (“U-Z”), Michoacan obsidian source area. Pottery analysis and classification aided by seriation analysis identified nine ceramic complexes and seven ceramic phases and sub-phases that both expand and refine the ceramic sequence previously established for the region by Gorenstein's (1985) investigations at nearby Acámbaro, Guanajuato. Initially established by ceramic cross-dating, the U-Z ceramic chronology has been largely confirmed by 30 radiocarbon dates and spans over 2,000 years of pre-Hispanic settlement, which included at least two notable episodes of trait-unit and site-unit intrusion from the eastern El Bajío and central Mexico. One of these episodes involved the appearance of two enclaves settled by individuals from the Acambay valley c. 90 km to the East, most likely from the site of Huamango, which our data indicate would have been occupied during the Middle Postclassic period.

Inside the Sun Pyramid at Teotihuacan, Mexico: 2008—2011 Excavations and Preliminary Results

2013 ◽  
Vol 24 (4) ◽  
pp. 403-432 ◽  
Author(s):  
Nawa Sugiyama ◽  
Saburo Sugiyama ◽  
Sarabia G. Alejandro
Keyword(s):  
The Sun ◽  
Phase 2 ◽  
Radiocarbon Dates ◽  
Construction Sequence ◽  
Preliminary Results ◽  
Architectural Features ◽  
Three Stages ◽  
Later Phase ◽  
Teotihuacan Mexico

After more than a century of explorations at the Sun Pyramid in Teotihuacan, many uncertainties about the function, meaning, chronology, and use of the monument remain unresolved. Here we present preliminary results from excavations and mapping conducted by the Sun Pyramid Project to address some of these issues. We focus particularly on describing the architectural features excavated in the interior of the pyramid as well as the subterranean tunnel. This evidence is used to argue that the subterranean structure was artificially constructed for ritual activities, including the placement of royal burials and/or offerings in its interior. We define three stages in the construction sequence of the Sun Pyramid: (1) a Pre-Sun Pyramid phase, (2) the establishment of the main corpus of the monument, and, finally, (3) the adjoining of the adosada platform. In each phase, we discuss the presence of burials, offerings, or other features uncovered. Furthermore, we present the results of new ceramic and radiocarbon dates that transform our understanding about the construction of the ceremonial center, where the Sun Pyramid and the subterranean tunnel are dated to a later phase than previously thought, from A.D. 170—310 and A.D. 140—240, respectively.

Chronology, Subsistence, and the Earliest Formative of Central Tlaxcala, Mexico

2006 ◽  
Vol 17 (4) ◽  
pp. 474-492 ◽  
Author(s):  
Richard G. Lesure ◽  
Aleksander Borejsza ◽  
Jennifer Carballo ◽  
Charles Frederick ◽  
Virginia Popper ◽  
...  
Keyword(s):  
General Model ◽  
Central Mexico ◽  
Radiocarbon Dates ◽  
Maize Agriculture ◽  
Ceramic Chronology ◽  
Agricultural Areas

We propose that pottery-using villages did not appear in the upland Apizaco region of central Tlaxcala, Mexico, until after 1000 B.C., centuries after such developments in choice locations for maize agriculture. We excavated at two of the earliest known Formative sites in the region. That work revealed abundant intact refuse deposits, allowing us to evaluate an existing ceramic chronology with new radiocarbon dates as well as characterize Formative subsistence. Our results support a more general model of emerging sedentism in central Mexico involving population dispersions from prime agricultural areas to zones of higher elevation. The earliest pottery-using agriculturalists in Apizaco were probably migrants from adjacent regions.

After the Axes? The Rock Art at Copt Howe, North-west England, and the Neolithic Sequence at Great Langdale

2019 ◽  
Vol 85 ◽  
pp. 177-192
Author(s):  
Richard Bradley ◽  
Aaron Watson ◽  
Peter Style
Keyword(s):  
Small Scale ◽  
The Sun ◽  
New Work ◽  
Neolithic Period ◽  
Late Neolithic ◽  
Radiocarbon Dates ◽  
North West ◽  
Direct View ◽  
Similar Character ◽  
Main Period

Within sight of the Neolithic axe quarries on the Langdale Pikes is a group of massive boulders at Copt Howe. The two largest command a direct view of the stone source where the sun sets into the mountainside at the midsummer solstice. Both are decorated by pecked motifs which resemble features of Irish passage tomb art. Small-scale excavation in 2018 showed that a rubble platform had been built at the foot of the main decorated surface and sealed two further motifs of similar character. New work has established an important sequence in Great Langdale. Recently obtained radiocarbon dates indicate that the main period of axe production was between 3800 and 3300 bc, whilst Irish megalithic art is later and was made between about 3300 and 2900 bc, suggesting that Copt Howe achieved its importance after axe-making had ceased or was in decline. That is consistent with an increasing emphasis on relations between northern Britain and Ireland during the Late Neolithic period. Perhaps Copt Howe itself was treated as a ‘natural’ passage tomb.

Chromospheric activity as a function of age in main-sequence stars

1966 ◽  
Vol 24 ◽  
pp. 40-43
Author(s):  
O. C. Wilson ◽  
A. Skumanich
Keyword(s):  
Main Sequence ◽  
The Sun ◽  
Main Sequence Stars ◽  
Tentative Conclusion ◽  
Chromospheric Activity ◽  
General Field ◽  
Large Clusters

Evidence previously presented by one of the authors (1) suggests strongly that chromospheric activity decreases with age in main sequence stars. This tentative conclusion rests principally upon a comparison of the members of large clusters (Hyades, Praesepe, Pleiades) with non-cluster objects in the general field, including the Sun. It is at least conceivable, however, that cluster and non-cluster stars might differ in some fundamental fashion which could influence the degree of chromospheric activity, and that the observed differences in chromospheric activity would then be attributable to the circumstances of stellar origin rather than to age.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Seti Space Missions

1997 ◽  
Vol 161 ◽  
pp. 761-776 ◽  
Author(s):  
Claudio Maccone
Keyword(s):  
Electromagnetic Waves ◽  
Space Missions ◽  
Gravitational Lens ◽  
The Sun ◽  
Space Antenna ◽  
Focal Distance ◽  
Large Space ◽  
The Earth ◽  
Space Antennas ◽  
New Space

AbstractSETI from space is currently envisaged in three ways: i) by large space antennas orbiting the Earth that could be used for both VLBI and SETI (VSOP and RadioAstron missions), ii) by a radiotelescope inside the Saha far side Moon crater and an Earth-link antenna on the Mare Smythii near side plain. Such SETIMOON mission would require no astronaut work since a Tether, deployed in Moon orbit until the two antennas landed softly, would also be the cable connecting them. Alternatively, a data relay satellite orbiting the Earth-Moon Lagrangian pointL2would avoid the Earthlink antenna, iii) by a large space antenna put at the foci of the Sun gravitational lens: 1) for electromagnetic waves, the minimal focal distance is 550 Astronomical Units (AU) or 14 times beyond Pluto. One could use the huge radio magnifications of sources aligned to the Sun and spacecraft; 2) for gravitational waves and neutrinos, the focus lies between 22.45 and 29.59 AU (Uranus and Neptune orbits), with a flight time of less than 30 years. Two new space missions, of SETI interest if ET’s use neutrinos for communications, are proposed.

A Search for Dyson Spheres around Late-Type Stars in the Solar Neighborhood II

1997 ◽  
Vol 161 ◽  
pp. 707-709 ◽  
Author(s):  
Jun Jugaku ◽  
Shiro Nishimura
Keyword(s):  
Solar Neighborhood ◽  
The Sun ◽  
Late Type ◽  
Solar Type

AbstractWe continued our search for partial (incomplete) Dyson spheres associated with 50 solar-type stars (spectral classes F, G, and K) within 25 pc of the Sun. No candidate objects were found.

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