Lake Titicaca: underwater archaeological sites

https://www.bbc.com/news/world-latin-america-46374651

Lake Titicaca: Underwater museum brings hope to shores, By Mónica García Zea
Lake Titicaca

"Following information provided by local people, archaeologist Christophe Delaere of the Free University of Belgium located 24 submerged archaeological sites in the lake's waters."

Peruvian dunes (Google Earth)

http://staff.polito.it/amelia.sparavigna/DUNE/

"Moving Dunes on the Google Earth" at http://arxiv.org/abs/1301.1290

(where I show how to use the time series of the Google Earth to estimate the motion of the barchans. I discuss also how to use reference points and adjust the Google images to have a "movie")

"A Study of Moving Sand Dunes by Means of Satellite Images"

at http://www.ijsciences.com/pub/article/229 

From Google Earth to Tatooine

Today (11 August 2013)  I found this article entitled "Star Wars home of Anakin Skywalker threatened by dune" http://www.bbc.co.uk/news/science-environment-23375344
It is told that "Sand dunes migrating over the Tunisian desert are poised to bury a famous Star Wars film set. The buildings of the fictional city Mos Espa featured in The Phantom Menace, "Episode I" of the Jedi saga. Sited on the planet Tatooine, this was the home of the young Anakin Skywalker ... Scientists have used the dwellings as a fixed geographic reference to measure the migration of giant wind-blown crescent-shaped dunes, or barchans. They have published details in the journal Geomorphology." The paper is in press, and you can see it at  http://www.sciencedirect.com/science/article/pii/S0169555X13003486
BBC continues "Ralph Lorenz, from Johns Hopkins University, ...  visited the Mos Espa site in 2009, and noted that part of a nearby set used in Star Wars Episode IV: A New Hope had already been overrun. Using satellite images of the site, they were able to determine the speed of dune movement, which is approaching the buildings once inhabited by such luminaries as Anakin, his slave owner Watto, and rival podracer Sebulba".
Before these "Dunes on the planet Tatooine",  on 4 January 2013 it was published  my "Moving Dunes on the Google Earth", as you can find at http://arxiv.org/abs/1301.1290, where I showed how to use the time series of the Google Earth to estimate the motion of the barchans. I used the barchans in Peru. I have also  discussed how to use reference points and adjust the Google images to have a "movie".
It seems that the authors of "Dunes on planet Tatooine: Observation of barchan migration at the Star Wars film set in Tunisia" do not know my "Moving dunes on the Google Earth" because my paper is not cited.
Therefore I cite myself!

And show you a "movie" of the barchan which is threatening Luke Skywalker's home.

More movies http://staff.polito.it/amelia.sparavigna/DUNE/

Chimu Surveying

An Ancient Surveying Equipment of Chimu
The Chimu lives in the pre-Columbian Peru, struggling to survive in one of the world's driest desert.

They were therefore "hydraulic engineers". Some of their knowledge about the management of water came from their predecessors, the Mochica, who lived in the Peru's Moche Valley during the 1st millennium AD. Mochica built a network of canals to irrigate their fields. 

 Adapted from http://www.specialtyinterests.net/eop.html

This is a Chimu surveying instrument shows how calculate the slope of the land. "The device consisted of a ceramic bowl pierced by a hollow sighting tube passing through a calibrated, cross-shaped opening (inset). And artificial horizon was established by aligning water with the three dots in the bowl, which was leveled in a larger, sand-filled vessel atop a tripod (far left); when the sighting tube was in the center of the cross-shaped opening it was parallel to the artificial horizon. Chimu surveyors marked a rod at the height of the level sighting tube, then moved the rod a known distance along uneven ground and sighted the mark. The ground slope corresponded to the tube angle indicated by the calibrations inside the bowl." From

Feats and wisdom of the ancients

Time-Life Books

2 Reviews

Time-Life Books, Aug 1, 1990 - History - 143 pages

Surveying and Hydraulic Engineering of the Pre-Columbian Chimú State: ad 900–1450, Charles R. Ortloff, Cambridge Archaeological Journal, Volume 5 / Issue 01 / April 1995, pp 55-74
Abstract The Chimú state of northern coastal Peru (ad 900–1480) developed massive irrigation-based agricultural systems supplied by intricate networks of canals drawing water from river sources in coastal valleys under their political control. Further intervalley canal systems, some up to 50 miles in length, were constructed to shunt water between river valleys to augment intravalley supplies. A high degree of civil engineering skill was necessary to construct and maintain such complex systems; knowledge of surveying and of open channel flow hydraulics was paramount. Some of the technology used by the Chimú has been investigated: surveying instruments and calculating tools have been unearthed and analyzed to provide some understanding of the technical base used for canal design. Details of the hydraulics knowledge-base have been extracted from computer simulation of the functioning of ancient Chimú canal designs. This article assembles known pieces of information related to Chimú civil engineering practice and attempts to provide a plausible methodology that could have been implemented by the Chimú to survey the precise canal bed slopes necessary for proper hydraulic functioning of large canal systems through rugged Andean foothill and mountain areas.

Empresa destruye patrimonio cultural

Empresa destruye patrimonio cultural
"El observatorio más antiguo de América, es afectado por trabajos de empresa autorizada por el INC. Desconocen informes que dan cuenta de restos arqueológicos alrededor de área patrimonial."
http://www.connuestroperu.com/actualidad/miscelanea/22-miscelanea/22705-empresa-destruye-patrimonio-cultural

Fairy chimneys in Peru

Fairy chimneys in Peru , Amelia Carolina Sparavigna, Dipartimento di Fisica, Politecnico di Torino, Torino, Italy

The erosion of water and wind on the rocks is able to create beautiful landscapes. Some places are well-known and have been declared natural heritage sites by UNESCO; some others are in desert and hostile regions, hard to visit. In most cases, just the local population knows these landscapes. In this post we will see that the simple action of some users of World Wide Web services, such as the Google Maps, in uploading their pictures, allows the discovery, study and perhaps future preservation of some of them. We will see in particular the case of some fairy chimneys in Peru, in the district of Pampachiri, Apurímac.

Before talking about this Peruvian landscape, let us discuss briefly the nature of these rocky structures, tall and thin cusps of rock protruding from the land. They are named in several manners [1]. These pinnacles are considered as "tent rocks", "fairy chimneys" or simply "earth pyramids", according to their shapes. Another name is “hoodoo": at first sight, this name seems to be derived from "hood" because of the structure looking like a sort of "dwarf hat", but probably its etymology is different [2]. Hoodoo is the common term used to describe the rock chimneys found in the western United States and Canada.

The fairy chimneys consist of a relatively soft rock. Some of them have on the top a harder stone, less easy to erode: the result is a geological structure resembling that of a chimney. These structures typically arise within sedimentary rocks or volcanic formations. The height of these chimneys can be of tenths of meters. Their shapes are affected by the existence of different and alternate layers of materials having different strength. In some regions, there are the freezing of water and the gravity that are creating these structures. The process is known as "frost wedging". The water, that percolates in the cracks of rocks, freezes and then expands, acting as a wedge and breaking the rocks apart [1,3]. This is the same action chiseling the landscape of Dolomites, the mountain range located in northeastern Italy [4]. During the night, when the temperature goes below the freezing point, the water into the fractures of rock turns into ice. The corresponding expansion of volume increases the distance between the sides of fractures. During the day, the sun warms the rocks and water melts. So separated from the bulk, some parts of the rock fall for gravity. In the case that the fairy chimneys are made by tuff rocks from volcanic eruptions, the erosion is due to wind and rain. In Italy, there are several areas with gullies (calanchi) and pinnacles, chiseled by water and wind. Well-known are the Calanchi di Volterra in Tuscany, but several others interesting places are in Abruzzo [5].

Among the best-known landscapes having fairy chimneys, there is that of Cappadocia, Turkey [6]. Besides the importance of this geophysical area, the region is quite interesting because Cappadocians carved their homes into the soft rock (see Fig.1). During the medieval era, this area becomes a refuge for Byzantine Christians. The people established monastic settlements and churches inside the pinnacles. According to [6], the Göreme Open-Air Museum in Cappadocia has the best-preserved collection of chapels and houses, most dating about the 11th Century [7]. The life in Cappadocia was even more complex, because, due to the persecution, the local Christians often had to hide themselves. It seems that, alarmed by the hoof beats [6], they could abandon the caves in the pinnacles to find a refuge in the underground. Beneath the ground of Cappadocia, archaeologists found a network of subterranean villages, the largest discovered is almost 10 levels deep, with narrow passages among them [6-9].

Fig.1. Fairy chimneys in Cappadocia (picture by Zeynel Cebeci, of a site at Ürgüp - Nevşehir, Turkey).

Not only Cappadocia has some houses inside the natural chimneys. We can find them also in Peru, near Pampachiri and San Pedro de Larcay. This is a region having several interesting places for geophysical and archaeological researches. In fact, there is the archaeological site of Wallpa Wiri, having structures of Incas age [10,11]. Moreover, this region possesses a large structured system of carved stones, used as landmarks for agricultural purposes, system created in the Late Horizon period of Peruvian prehistory [11]. Analyzing this landscape within its agricultural and social context [11], the researcher provided evidence of water distribution and management of the irrigation cycles by the Incas; that is, there was an administration and management of the local agricultural processes by the central government. A survey of the region with Google Maps reveals the presence, at south-west of San Pedro, coordinates -14.178624,-73.592713, of several "qochas", ponds with a diameters of about 100 meters (see Fig.2).

Fig.2. Qochas near San Pedro. The average size is about 100 meters.

Linked together by a network of canals, qochas form a system of water and soil management [12]. This system is probably of pre-Incaic origin.

Unfortunately, the satellite map corresponding to this area has a limited resolution. However, Google Maps has an interesting feature: it is possible to drag the icon of the street view on the map and see if there are photos of the landscape uploaded by users. Doing this dragging, the location of the pictures appears as blue dots on the map (see Fig.3). In this manner, anybody using the map can have some information on the landscape corresponding to the specific location. There are no photos of the qochas of San Pedro, but many pictures of nearby locations, uploaded by Max Altamirano Molero [13]. Besides being very beautiful, the pictures display the existence of a forest of fairy chimneys. The location in the Pampachiri district is given in the map of Fig.3.

Fig.3. The position of San Pedro de Larcay, Peru, in the district of Pampachiri is given by the green arrow. The location of the fairy chimneys is given by the blue dots corresponding to the photo

Fig.4. The image shows a part of the very interesting set of images by Max Altamirano Molero. To see them, the reader can visit [13].

To the author’s knowledge, the pictures by Altamirano are among the best existing documentations of fairy chimneys in Peru . In fact, among the pictures that Altamirano has collected on a site (see Fig.4 and directly at [13]), several images are showing that some dwelling places have been obtained under or inside the fairy chimneys. It seems, as far as it is possible to gain from his pictures that a supporting structure of stones had built to reinforce the chimney (Fig.5). Only a local survey and analysis can tell how many and how old these structures are. For me, a physicist, it is also interesting to model their thermodynamic behavior, such as that of the chimneys in Cappadocia, to see if there are some thermal benefits in using them as houses.

In conclusion, we have seen that a fairy chimneys landscape exists in Peru, where some of the chimneys seem used as dwelling places. Moreover, the documentation of these remarkable structures is due to the activity of a Google Maps user, demonstrating that each user can help in the process of spreading the knowledge of existing cultural landscapes.

Fig.5. This image is adapted from a picture by Max Altamirano Molero, to show the importance of the pictures he collected. Note how the fairy chimneys had been transformed in a dwelling place.

References

1. Frank R. Spellman, Geography for Nongeographers, Government Institutes, 2010

2. www.scienceclarified.com/landforms/Ocean-Basins-to-Volcanoes/Plateau.html

3. How do you make a Hoodoo?, Bryce Canyon National Park,

 www.electronicfieldtrip.org/bryce/lessons/Lesson1.pdf

4. In August 2009, the Dolomites were declared a natural heritage site by UNESCO.

5. Roberto D’Andrea, Il Geosito dei Calanchi di Atri, Tesi di laurea, 2007, Università degli studi “G. d’Annunzio” di Chieti.

6. James Bainbridge, 30 May 2011, BBC, www.bbc.com/travel/feature/20110421-turkeys-land-of-fairy-chimneys

7. Spiro Kostof, Caves of God: Cappadocia and its Churches, Oxford University Press, 1989

8. Lyn Rodley, Cave Monasteries of Byzantine Cappadocia, Cambridge University Press, 2010

9. Thomas Krassmann, Unterirdische Städte in Kappadokien, http://www.mineral-exploration.com/mepub/kaymakli.pdf

10. Rocio Ferrel, ConNuestroPeru, private communication, 2011.

11. Frank Meddens, Rocks in the Landscape: Managing the Inka Agricultural Cycle, The Antiquaries Journal, 86, 2006, pp 36–65

12. Amelia Carolina Sparavigna, Qochas on Andean highlands, Archaeogate, May 5,  2011.

13. Photos by Max Altamirano Molero, in the Google Earth (KML), see also Panoramio, http://www.panoramio.com/user/4345310

100 años de Machu Picchu

100 años de Machu Picchu a 100 km de indígenas aislados - ConNuestroPeru
"El 24 de julio se celebra el centenario del "descubrimiento" de Machu Picchu, la ciudadela inca en lo alto de los Andes peruanos, por el explorador y académico estadounidense Hiram Bingham. Pero al tiempo que Perú celebra el legado de los indígenas incas, también planea garantizar a las empresas de hidrocarburos el acceso a las tierras de los indígenas aislados en la reserva de Kugapakori-Nahua-Nanti, lo que supondría un riesgo extremo para sus vidas. "

More

100 años de Machu Picchu a 100 km de indígenas aislados

Fotografías de Hiram Bingham en Machu Picchu

La National Geographic Society ha donado un histórico material que muestra a la ciudadela entre 1911 y 1915, perennizada para el mundo en el lente de explorador norteamericano.

Ministerio de cultura exhibe fotografías de Hiram Bingham en Machu Picchu

Source: ConNuestroPeru

Snake near the lake

Image from Google Maps: a geoglyph near the Titicaca Lake, Peru.

This image shows a plain area covered by a network of waru-warus, that is, of the "raised fields" - earthworks separated by canals - near the Titicaca Lake. This is an ancient agricultural technique used by Andean people starting from the first millennium BC. Note that the structure of the network is created after a careful planning. Each raised field is approximately 10 meters large and more than one hundred long. 

It seems a snake, the pond as its eye and a forked tongue. More on waru-warus: arXiv:1009.4602 [pdf] Geoglyphs of Titicaca as an ancient example of graphic design, Amelia Carolina Sparavigna, and arXiv:1009.2231 [pdf] Symbolic landforms created by ancient earthworks near Lake Titicaca, Amelia Carolina Sparavigna

El Inca

"El Inca, Garcilaso de la Vega (April 12, 1539–1616), born Gómez Suárez de Figueroa, was a historian and writer from the Spanish Viceroyalty of Peru. The son of a Spanish conquistador and an Inca noblewoman, he is recognized primarily for his contributions to Inca history, culture, and society. Although not all scholars agree, many consider Garcilaso's accounts the most complete and accurate available. Because there was also a Spanish author named Garcilaso de la Vega, he is more commonly known as "El Inca" Garcilaso de la Vega, or simply "El Inca Garcilaso"."

http://en.wikipedia.org/wiki/Garcilaso_de_la_Vega_(El_Inca)

La cultura Andina y el Sumaq Kawsay

Interessante discussione su ConNuestroPeru

Es la cultura Andina y el Sumaq Kawsay… ¿Cuna de la utopía real* y del pensamiento utópico europeo?

Picaflores que llegan hasta el sol

"El otro principio fue el de considerar siempre el Perú como una fuente infinita para la creación. Perfeccionar los medios de entender este país infinito mediante el conocimiento de todo cuanto se descubre en otros mundos. No, no hay país más diverso, más múltiple en variedad terrena y humana; todos los grados de calor y color, de amor y odio, de urdimbres y sutilezas, de símbolos utilizados e inspiradores. No por gusto, como diría la gente llamada común, se formaron aquí Pachacamac y Pachacutec, Huamán Poma, Cieza y el Inca Garcilaso, Túpac Amaru y Vallejo, Mariátegui y Eguren, la fiesta de Qoyllur Riti y la del Señor de los Milagros; los yungas de la costa y de la sierra; la agricultura a 4000 metros; patos que hablan en lagos de altura donde todos los insectos de Europa se ahogarían; picaflores que llegan hasta el sol para beberle su fuego y llamear sobre las flores del mundo. Imitar desde aquí a alguien resulta algo escandaloso. En técnica nos superarán y dominarán, no sabemos hasta qué tiempos, pero en arte podemos ya obligarlos a que aprendan de nosotros y lo podemos hacer incluso sin movernos de aquí mismo. Ojalá no haya habido mucho de soberbia en lo que he tenido que hablar; les agradezco y les ruego dispensarme."
JOSE MARÍA ARGUEDAS ALTAMIRANO
Palabras en el acto de entrega del premio “Inca Garcilaso de la Vega”
Lima, Octubre de 1968.http://cinosargo.bligoo.com/content/view/231404/NO-SOY-UN-ACULTURADO-por-JOSE-MARIA-ARGUEDAS.html

Mike Ruggieri's News

Mike Ruggeri’s Ancient Andean Archaeology News

April 13, 2011

"Oldest Textiles in South America
Textiles and rope fragments that were found 30 years ago in Guitarrero Cave in the Andes have now been dated to 10,000 BCE, making them the oldest textiles ever found in South America. ... Textile weaving took place in these caves showing that women were probably amo

ng the first to live at these altitudes in the area. The article will appear in the current issue of Current Anthropology."
http://web.me.com/michaelruggeri/Mike_Ruggeris_Ancient_Andean_Archaeology_News/Mike_Ruggeris_Ancient_Andean_Archaeology_News.html

Guaman Poma

Da Wikipedia.
Felipe Guaman Poma de Ayala, conosciuto anche come Guaman Poma (San Cristóbal de Suntuntu, località della provincia di Lucanas nella regione di Ayacucho, 1550 ca. – dopo il 1615), è stato un cronista indigeno del Perù durante la conquista dell'America.
 « Questo è il nostro paese, perché Dio ce lo ha dato »
Era il figlio di Guaman Mallqui e Juana Cori Ocllo Coya (ultima figlia del sovrano Túpac Yupanqui)...
Nel 1908, nella Biblioteca Reale di Copenaghen (Danimarca), fu riscoperto un antico manoscritto di 1179 pagine: la Nueva Corónica y Buen Gobierno di Felipe Guaman Poma de Ayala, di cui non si avevano più notizie da circa 300 anni. ...
Questa opera, di altissimo valore storico, aveva in origine un obiettivo concreto: ritrarre la realtà andina e sollecitare la corona spagnola ad effettuare una riforma del governo coloniale per salvare le popolazioni andine dallo sfruttamento e dai maltrattamenti. La relazione, infatti, era dedicata al re Filippo III di Spagna, ma andò smarrita durante il viaggio verso la penisola iberica. Oggi si conserva nella Biblioteca Reale di Copenaghen e si può consultare on-line.
http://www.kb.dk/permalink/2006/poma/info/en/frontpage.htm

Le "qochas" dell'altopiano andino.

Le "qochas" dell'altopiano andino.

In quechua, il termine "qocha" si riferisce a un piccolo lago o stagno o di origine naturale o artificiale, oppure ad un tipo di vasellame. Una "qocha" artificiale del periodo Inca si trova alla periferia di Cuzco, vicino al Rodadero, ed è la monumentale  "Qocha Chincanas", un lago artificiale creato per scopi cerimoniali.
Un'antica tecnica agricola è basata sull'impiego delle qochas, sia naturali o create artificialmente, collegate tra loro da una rete di canali. Esse formano un sistema di gestione delle acque e del suolo adatto a coltivare patate e quinoa a rotazione col pascolo. Queste strutture si trovano in alcune aree pianeggianti di Perù e Bolivia, nei pressi del lago Titicaca, ad un'altitudine media di 4000 metri. Le qochas sono molto numerose  nel dipartimento di Puno (Perù).
Un libro molto interessante intitolato "Agricultures Singulières", che discute alcune antiche tecniche agricole, dedica un capitolo alle qochas: secondo questo testo [1], i popoli andini hanno potuto prosperare grazie a dei sistemi agricoli, tra cui le qochas, che permettevano un utilizzo flessibile del suolo in una regione che spesso subisce periodi di siccità seguiti da inondazioni.
La forma più comune della qocha è rotonda e misura dai 30 ai 200 metri di diametro. La sua struttura concava raccoglie la pioggia tramite i suoi canali radiali e circolari (vedi figura), riducendone anche la forte evaporazione provocata dalla radiazione solare e dal vento. Adriano Forgione suggerisce che una tale struttura potrebbe permettere di misurare il tempo. In effetti, la struttura concava radiale può fornire molti punti di riferimento, per verificare il momento migliore per la semina.
Fino a cinquant'anni fa, qochas e waru-warus erano molto più utilizzati. L'introduzione dei macchinari agricoli sta portando all'abbandono o alla distruzione di queste forme tradizionali di agricoltura [2].  I waru-warus sono i "campi rialzati", un'altra tecnica agricola molto utilizzata nei pressi del Lago Titicaca.  Oltre a qochas e waru-warus, vi sono altre antiche strutture agricole in Perù e Bolivia: ci sono i "bofedales", zone umide artificiali, le "andenes", che sono le colline terrazzate e i "puquios". I puquios più noti sono quelli di Nasca. Sono un sistema di gallerie sotterranee di filtraggio che forniscono l'acqua per l'irrigazione e gli usi domestici nell'area centrale di Nasca e in altre zone del Perù [3].
Il sistema di qochas ha una origine pre-incaica, come mostrato dai frammenti di ceramica trovati nelle loro vicinanze. Sebbene il sistema agricolo delle qochas sia probabilmente anteriore, di solito è associato alla cultura Pukara. Pukara era un centro importante per centinaia di anni dal 1300 aC. Tra il 250 aC e il 380 dC, divenne un importante sito religioso, densamente popolato. La società dei Pukara aveva una  gestione centralizzata delle acque. Con l'ascesa di Tiwanaku,  l'area è stata progressivamente abbandonata. Dopo la sua caduta, attorno al 1000 DC, l'area si ripopolò e le qochas vennero di nuovo usate. Durante i seguenti prolungati periodi di siccità, l'uso delle qochas divenne essenziale per la sopravvivenza delle popolazioni locali. Il successo di queste strutture sta nel fatto che esse sono abbastanza semplici e piccole: ognuna può essere gestita da una sola famiglia garantendone la sussistenza alimentare, mentre il terreno che la circonda è lasciato a pascolo.  Oggi, molte qochas sono state abbandonate per la crescente salinità del suolo e per l'uso di macchinari agricola. La loro lunga persistenza nella storia passata dice però  che il loro uso è forse quello più adatto e sostenibile dall'ambiente andino.

1. Agricultures Singulières, Mollard Eric, Walter Annie, Editors, IRD Éditions, Institute of Development Research, Paris, 2008.
2. Los camellones alrededor del lago Titicaca, Pierre Morlon, in Agricultura ancestral: camellones y albarradas. Institut français d'études andines. Quito, 2006.
3.The Puquios of Nasca, Katharina Jeanne Schreiber, Josué Lancho Rojas, Latin American Antiquity, Vol. 6, No. 3, Sep., 1995

Solo metà della struttura originaria di questa qocha in Perù si è salvata.

Pleiades in Peru

On an ancient calendar
"Most historians agree that the Inca had a calendar based on the observation of both the Sun and the Moon, and their relationship to the stars. Names of 12 lunar months are recorded, as well as their association with festivities of the agricultural cycle... A count of this sort was described by Alexander von Humboldt for a Chibcha tribe living outside of the Inca Empire, in the mountainous region of Colombia... The smallest unit of this calendar was a numerical count of three days, which, interacting with a similar count of 10 days, formed a standard 30-day month. Every third year was made up of 13 moons, the others having 12. This formed a cycle of 37 moons, and 20 of these cycles made up a period of 60 years, which was subdivided into four parts and could be multiplied by 100. A period of 20 months is also mentioned. ...
In one account, it is said that the Inca Veracocha established a year of 12 months, each beginning with the New Moon, and that his successor, Pachacuti, finding confusion in regard to the year, built the sun towers in order to keep a check on the calendar. Since Pachacuti reigned less than a century before the conquest, it may be that the contradictions and the meagerness of information on the Inca calendar are due to the fact that the system was still in the process of being revised when the Spaniards first arrived.
Despite the uncertainties, further research has made it clear that at least at Cuzco, the capital city of the Inca, there was an official calendar of the sidereal-lunar type, based on the sidereal month of 27 1/3 days. It consisted of 328 nights (12X271/3) and began on June 8/9, coinciding with the heliacal rising (the rising just after sunset) of the Pleiades; it ended on the first Full Moon after the June solstice (the winter solstice for the Southern Hemisphere). This sidereal-lunar calendar fell short of the solar year by 37 days, which consequently were intercalated. This intercalation, and thus the place of the sidereal-lunar within the solar year, was fixed by following the cycle of the Sun as it strengthened to summer (December) solstice and weakened afterward, and by noting a similar cycle in the visibility of the Pleiades."
This is what we find at the page
http://www.lost-civilizations.net/inca-civilization-page-5.html

On Pleiades see

http://arxiv.org/abs/0810.1592

The Pleiades: the celestial herd of ancient timekeepers by Amelia Carolina Sparavigna, (Submitted on 9 Oct 2008). In the ancient Egypt seven goddesses, represented by seven cows, composed the celestial herd that provides the nourishment to her worshippers. This herd is observed in the sky as a group of stars, the Pleiades, close to Aldebaran, the main star in the Taurus constellation. For many ancient populations, Pleiades were relevant stars and their rising was marked as a special time of the year. In this paper, we will discuss the presence of these stars in ancient cultures. Moreover, we will report some results of archeoastronomy on the role for timekeeping of these stars, results which show that for hunter-gatherers at Palaeolithic times, they were linked to the seasonal cycles of aurochs.
http://philosophyofscienceportal.blogspot.com/2008/10/pleiades-and-mythology.html
http://en.wikipedia.org/wiki/Taurus_(constellation)
http://en.wikipedia.org/wiki/Star_chart

Just lines?

Near the shore of the Titicaca Lake, the raised fields are well preserved.

They are arranged to form symbols, not just parallel lines!

A bird and a lamb? Or other animals?

This image, obtained after processing a Google Maps image, shows some waru-warus, that is,  the "raised fields" - earthworks separated by canals. This is an ancient agricultural technique used by Andean people starting from the first millennium BC. Each raised field is approximately 10 meters large and more than one hundred long. 

More on waru-waru

arXiv:1009.4602 [pdf] Geoglyphs of Titicaca as an ancient example of graphic design, Amelia Carolina Sparavigna

arXiv:1009.2231 [pdf] Symbolic landforms created by ancient earthworks near Lake Titicaca, Amelia Carolina Sparavigna

Andenes

Andenes are an ancient method to cultivate the Andean highlands.

Here an image from Google Maps.

Alpaca

In the "The Continuum encyclopedia of animal symbolism in art", by Hope B. Werness, we can find a very interesting discussion on Alpaca.

Radial structures at Rodadero

As discussed in some previous posts on "qochas", these structures had and have an agricultural function. Some qochas had a ceremonial use too. At Rodadero (Cusco) we find the huge Qocha Chincanas.
Near the parking of this archaeological site, where it is placed the statue of the White Christ, the satellite imagery (Google Maps) shows two radial/circular structures as those used for agricultural purposed near Titicaca lake.