Pyramids of Giza

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Great Pyramid of Giza

The Great Pyramid of Giza, (sometimes spelled Gizeh) is the oldest and last remaining of the Seven Wonders of the World and the most famous pyramid in the world. It is presumed to have served as the tomb of the Fourth dynasty Egyptian Pharaoh Khufu (also known under his Greek name Cheops), after whom it is often called "Khufu's pyramid."

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The Great Pyramid of Giza in a 19th century photo

Age and location

The most widely accepted estimate for its date of completion is 2570 BC; it is the oldest and largest of the three great pyramids in the Giza necropolis on the outskirts of modern Cairo, Egypt.

A few hundred metres southwest of Khufu's Great Pyramid lies the slightly smaller pyramid of Khafre, one of Khufu's successors who also built the Great Sphinx, and a few hundred metres further southwest is the pyramid of Menkaure, Khafre's successor, which is about half as tall. Khafre's pyramid appears the tallest on some photographs as it is somewhat steeper and built on higher terrain.

Construction

giza pyramids

Pyramids of Egypt The famous pyramids located in Giza, near the city of Cairo, Egypt, are the oldest and best preserved of the Seven Wonders of the World. Ancient Egyptian kings had them built as their tombs, although ancient Greeks and Romans believed the structures to be purely ornamental. The largest pyramid, called the Great Pyramid, now stands 137 m (450 ft) tall. The Great Pyramid and two other pyramids, built from about 2600 to 2500 bc, are the best remaining examples of this Egyptian architectural feat.

At construction the Great Pyramid was 146 metres (481 feet) tall, but due to erosion its current height is 137 metres (450 feet). It covers more than 5.5 hectares (13.5 acres) at the base, which is a square of over 235 metres (775 feet) on each side. For four millennia it was the world's tallest building, not being surpassed until the 160-metre tall spire of Lincoln Cathedral was completed in around 1300. The accuracy of work is such that the four sides of the base have only a mean error of 0.6 inch in length and 12 seconds in angle from a perfect square. The sides of the square are aligned quite precisely in North-South and East-West directions. The sides of the pyramid rise at an angle of approximately 5151''.

The pyramid was constructed of limestone, basalt, and granite stones from two to four tonnes in weight each, adding up to a total estimated weight of some 7 million tonnes, and a volume of 2,600,600 cubic metres. It is the largest Egyptian pyramid. (The Great Pyramid of Cholula, in Mexico is larger in volume.) When originally built, the pyramid had inset facing blocks of polished limestone, creating smooth sides; they have since fallen out, or been recycled for other building projects, leaving the underlying step-pyramid structure visible. (The smooth outer cover is still visible at the very top of Khafre's pyramid.)

The Great Pyramid of Giza

Sphinx & pyramids

The Great Pyramid differs in its internal arrangement from the other pyramids in the area. The greater number of passages and chambers, the high finish of parts of the work, and the accuracy of construction all distinguish it. Three chambers lie, one over another, on the internal axis of the pyramid. The lowest chamber is cut in the bedrock upon which the entire pyramid was built; it is the largest of the three and appears to be unfinished, roughly cut in stone. The middle chamber is the smallest; it is the so-called queen chamber, but this is a modern name and hardly means anything, there never was a queen in here, nor indeed was this ever intended as a burial chamber. A niche in its wall indicates a statue of the king once stood here, and likely this chamber was a sredab; a sealed chapel with a statue of the deceased king. Such chapels were a common feature of pyramid architecture, and in earlier pyramid complexs they are found amongst the cultic spaces outside the pyramid. The uppermost chamber was the king's burial chamber, equipped with a huge granite sarcophagus which must have been placed in it during construction, since it is far too big to pass through the tiny passageway of the burial chamber.

A descending passage leads from the entrance of the pyramid to the underground chamber. About half-way along, a second passage ascends towards the upper chambers. This again breaks into two corridors, one horizontal, leading to the 'queen' chamber, and the other still ascending, leading into the burial chamber. This final asscending corridor is a fantastic space with a height of aprox. 8 metres, which earned it a name of 'grand gallery'. The grand gallery leans next to the walls of the burial chambers, and is connected with it through a tiny, tight passageway.

This passageway once contained crude stone mechanisms for one-time release of huge granite blocks which sealed the entrance into the burial chamber. The grand gallery also contained some sort of mechanism for the release of a huge stone block which plugged the ascending passage. The entire upper part of the pyramid was thus sealed after the burial of the king. There was one secret passage that was not sealed, leading through the very rock upon which the pyramid was built, towards the descending passage and outside the pyramid, through which the last of the workers and funerary priests could escape after the burial of the king.

Apart from accessible chambers and corridors, the Great Pyramid also holds inaccessible spaces. The so-called 'air shafts' are canals which run through the stone mass of the pyramid at certain angles, connecting the burial chamber of the king with the north and south face of the pyramid outside. Why these were planned and built is not known, although they were certainly not 'air' or 'ventilation' shafts. It is possible that they had a symbolic meaning, allowing the soul of the deceased king to travel to the stars in the north and south sky, which were important in Egyptian religon and mythology.

Another interesting feature of the Great Pyramid are the so-called 'relieving chambers'. This is an ingenious system raised over the king's burial chamber, constructed to relieve vertical and horizontal loads. The relatively thin wall between the burial chamber and the grand gallery likely could not absorb all of the horizontal pressure from the granite roof of the chamber. Thus, the granite roof had to be raised above the level of grand gallery. However, this created another problem, since now the walls of the burial chamber would be more than 8 meters high, and thus very unstable. Thus, huge granite slabs were placed horizontally as stabilisers between the walls, one above another. The empty spaces between granite slabs today are called 'relieving' chambers, though they were never meant to be accessed; and were not until the 19th century, when they were opened by dynamite. This, turned out to be an incredibly valuable discovery. Since the 'relieving chambers' were never meant to be accessed, the stone blocks on their walls were not prepared and laid as carefully as those in the accessible interior of the pyramid. Thus, graffiti of the pyramid workers were found inscribed on some of the blocks, mentioning the names of the worker crews which built the pyramid (or at least placed these particular stones), and the year of rule and the name of the pharaoh who had the pyramid built: Khufu. The Great Pyramid is otherwise completely empty of any inscriptions or hieroglyphs whatsoever. This is the only evidence which proves that pharaoh Hor Medjedu Khnum Khufu had the Great Pyramid built, and that this is, in fact, the legendary king which Herodotus calls Kheops.

Labor

Herodotus, the Greek historian in the 5th century BC, estimated that construction of the Great Pyramid may have required the labor of 100,000 slaves for 30 years. Polish architect Wieslaw Kozinski believed that it took as many as 25 men to transport a 1.5-ton stone block; based on this, he estimated the workforce to be 300,000 men on the construction site, with an additional 60,000 off-site. More recent research suggests that these may be overestimates, however; mathematician Kurk Mendelssohn, for instance, calculated that the labor force may have been 50,000 men at most, while Ludwig Borchardt and Louis Croon placed the number at 36,000. According to modern Egyptologist Miroslav Verner, the general consensus today is that a labor force of no more than 30,000 was needed in the Great Pyramid's construction.

19th century Egyptologist William Flinders Petrie proposed that the labor force was largely composed not of slaves, but of the rural Egyptian population, working during periods when the Nile river was flooded, and agricultural activity suspended; this theory is accepted by many today. Verner believes that the labor was organized into a hierarchy, consisting of two gangs of 1000 men, divided into five zaa or phyle of 200 men each, which may have been further divided according to the skills of the workers.

Herodotus speculated that the stone blocks used in the Great Pyramid's construction were maneuvered into place by raising them up a succession of short wooden scaffolds. Another possibility, proposed by the ancient scholar Diodorus Siculus, was that the stones were dragged along a system of ramps to the necessary height; this theory is more widely accepted today, though there remains considerable debate over what kind of ramps may have been used. Modern scholar Mark Lehner has speculated that a spiralling ramp, beginning in the stone quarry to the southeast, and continuing around the exterior of the pyramid, may have been used. The stone blocks may have been drawn on sleds, lubricated by water.

The most precisely cut stones were reserved for the outside. Once in place their corners were smoothened to give an almost shiny outer appearance of the pyramid.

Numerical significance

Some of those who have examined the Great Pyramid have made speculations regarding the numerical significance of the dimensions, angles, and ratios present in the structure.

One popular assertion is that the ratio of the pyramid's perimeter to its height times two ( P / ( 2 H ) ) gives a close approximation of the mathematical value pp; that is, the height is to the perimeter as the radius is to the circumference of a circle. This characteristic is determined by the linear slope of one of the pyramid's sides; any pyramid with a slope of arctan ( 4 / pp ), or approximately 5151''14??, will have this characteristic.

The sides of the Great Pyramid have this approximate slope; it is peculiar in this respect, as it more closely expresses this slope than any other surviving Egyptian pyramid. William Flinders Petrie determined the weighted mean angle of the north face of the Great Pyramid to be 5150''40??, within 35 arcseconds, or about 0.01 degrees, of an exact expression of pp. Colonel Howard-Vyse, in 1837, discovered two intact and in situ casing stones, from which he determined the slope to be between 5150'' and 5152''15.5??, while Charles Piazzi Smyth, Astronomer Royal of Scotland, in 1865 estimated the overall angle to be 5151''14??, based on measurements of several surviving casing stone fragments and the angle of the pyramid itself. Whether the Great Pyramid's builders intended for the structure to express pp is unknown.

Additionally, Smyth claimed that the measurements he obtained from the Great Pyramid indicate a unit of length, the pyramid inch, equivalent to roughly 1.01 British inches, that could have been the standard of measurement by the pyramid's architects. From this he extrapolated a number of other measurements, including the pyramid pint, the sacred cubit, and the pyramid scale of temperature. Applying these to the dimensions of the structure, he inferred the existence of expressions of the polar diameter and mean density of the Earth, the length of a solar day, the distance from the Earth to the Sun, and the precession of the equinoxes. These derivations are frequently regarded by skeptics as having no scientific merit, and of being merely an artificial device for attributing numerical significance to the Great Pyramid's dimensions.

Paranormal and prophetical allegations

As a structure of impressive construction and mystery, the great pyramid has attracted the attention of occultists (as have many other aspects of ancient Egyptian culture). The great pyramid and the Sphinx are often alleged to have been built with mysterious ancient forces rather than human labor and/or by Atlanteans, extraterrestrials, or other mysterious creators.

It has also been alleged that the dimensions and details of the Great Pyramid, properly interpreted, provide prophecies of events in modern times. This theory was first proposed in the 1800s by John Taylor, who believed the pyramid had actually been constructed by the biblical Noah. Charles Piazzi Smyth later elaborated on this theory in his book Our Inheritance in the Great Pyramid. No scientific evidence has been found to support these allegations to date. Edgar Cayce was apparently sympathetic to the idea, though his convoluted language makes it difficult to be certain.

 

 

 

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