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Great Pyramid of Giza
General information
Location	Giza, Egypt
Height
Roof	138.8 m, 455.2 ft (Originally: 146.6 m, 480.9 ft)

The Great Pyramid of Giza , also called Khufu's Pyramid or the Pyramid of Khufu, and Pyramid of Cheops, is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now Cairo, Egypt in Africa, and is the only remaining member of the Seven Wonders of the Ancient World. It is believed the pyramid was built as a tomb for Fourth dynasty Egyptian pharaoh Khufu (Cheops in Greek) and constructed over a 20 year period concluding around 2560 BC. The Great Pyramid was the tallest man-made structure in the world for over 3,800 years. Visibly all that remains is the underlying step-pyramid core structure seen today. Many of the casing stones that once covered the structure can still be seen around the base of the Great Pyramid. There have been varying scientific and alternative theories regarding the Great Pyramid's construction techniques. Most accepted construction theories are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place.

There are three known chambers inside the Great Pyramid. The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished. The Queen's Chamber and King's Chamber are higher up within the pyramid structure. Despite precautions such as covering the entrance hole with casing and the portcullises, thieves had bypassed all the barriers even before the Old Kingdom had ended, digging through the soft limestone and breaking a corner of Khufu's sarcophagus while removing the lid. The Great Pyramid is the only pyramid known to contain both ascending and descending passages.

The Great Pyramid of Giza is the main part of a complex setting of buildings that included two mortuary temples in honor of Khufu (one close to the pyramid and one near the Nile), three smaller pyramids for Khufu's wives, an even smaller "satellite" pyramid, a raised causeway connecting the two temples, and small mastaba tombs surrounding the pyramid for nobles.

Wonder of the Ancient World

It is believed the pyramid was built as a tomb for Fourth dynasty Egyptian pharaoh Khufu and constructed over a 20 year period concluding around 2560 BC. Khufu's vizier, Hemon, or Hemiunu, is believed by some to be the architect of the Great Pyramid. It is thought that, at construction, the Great Pyramid was 280 Egyptian royal cubits tall, 146.6 meters, but with erosion and the loss of its pyramidion, its current height is 138.8 m. Each base side was 440 royal cubits, with each royal cubit measuring 0.524 meters. The total mass of the pyramid is estimated at 5.9 million tonnes. The volume, including an internal hillock, is believed to be roughly 2,500,000 cubic metres. The first precision measurements of the pyramid were done by Egyptologist Sir Flinders Petrie in 1880–82 and published as The Pyramids and Temples of Gizeh. Almost all reports are based on his measurements. Petrie found the pyramid is oriented 4' west of North and the second pyramid is similarly oriented.

The Great Pyramid was the tallest man-made structure in the world for over 3,800 years, unsurpassed until the 160 metre tall spire of Lincoln Cathedral was completed c. 1300. The accuracy of the pyramid's workmanship is such that the four sides of the base have a mean error of only 58 mm in length, and 1 minute in angle from a perfect square. The base is horizontal and flat to within 15 mm. The sides of the square are closely aligned to the four cardinal compass points to within 3 minutes of arc and is based not on magnetic north, but true north. The design dimensions, as confirmed by Petrie's survey and all those following this, are assumed to have been 280 cubits in height by 4x440 cubits around originally, and as these proportions equate to 2π to an accuracy of better than 0.05%, this was and is considered to have been the deliberate design proportion by Petrie, I. E. S. Edwards, and Miroslav Verner. Verner wrote "We can conclude that although the ancient Egyptians could not precisely define the value of π, in practise they used it".

Casing stones

At completion, the Great Pyramid was surfaced by white 'casing stones' – slant-faced, but flat-topped, blocks of highly polished white limestone. Visibly all that remains is the underlying step-pyramid core structure seen today. In AD 1301, a massive earthquake loosened many of the outer casing stones, which were then carted away by Bahri Sultan An-Nasir Nasir-ad-Din al-Hasan in 1356 in order to build mosques and fortresses in nearby Cairo. The stones can still be seen as parts of these structures to this day. Later explorers reported massive piles of rubble at the base of the pyramids left over from the continuing collapse of the casing stones which were subsequently cleared away during continuing excavations of the site. Nevertheless, many of the casing stones around the base of the Great Pyramid can be seen to this day in situ displaying the same workmanship and precision as has been reported for centuries. Petrie also found a different orientation in the core and in the casing measuring 193 cm ± 25 cm. He suggested a redetermination of north was made after the construction of the core, but a mistake was made, and the casing was built with a different orientation.

Construction theories

There have been varying scientific and alternative theories regarding the Great Pyramid's construction techniques. Most accepted construction theories are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place. The disagreements center on the method by which the stones were conveyed and placed. A recent theory proposes that the building blocks were manufactured in-place from a kind of "limestone concrete". In addition to the many theories as to the techniques involved, there are also disagreements as to the kind of workforce that was used. One theory, suggested by the Greeks, posits that slaves were forced to work until the pyramid was done. This theory is no longer accepted in the modern era, however. Archaeologists believe that the Great Pyramid was built by tens of thousands of skilled workers who camped near the pyramids and worked for a salary or as a form of paying taxes until the construction was completed. The worker's cemeteries were discovered in 1990 by archaeologists Zahi Hawass and Mark Lehner. Verner posited that the labor was organized into a hierarchy, consisting of two gangs of 100,000 men, divided into five zaa or phyle of 20,000 men each, which may have been further divided according to the skills of the workers.

Inside the Great Pyramid

There are three known chambers inside the Great Pyramid. These are arranged centrally, on the vertical axis of the pyramid. From the entrance, an 18 meter corridor leads down and splits in two directions. One way leads to the lowest and unfinished chamber. This chamber is cut into the bedrock upon which the pyramid was built. It is the largest of the three, but totally unfinished, only rough-cut into the rock. The other passage leads to the Grand Gallery (49 m x 3 m x 11 m) where it splits again. One tunnel leads to the Queen's Chamber, a misnomer, while the other winds to intersect with the descending corridor. The Grand Gallery itself features an ingenious corbel halloed design and several cut "sockets" spaced at regular intervals along the length of each side of its raised base with a "trench" running along its center length at floor level. What purpose these sockets served is unknown. An antechamber leads from the Grand Gallery to the King's Chamber.

King's Chamber

At the end of the lengthy series of entrance ways leading into the pyramid interior is the structure's main chamber, the King's Chamber. This chamber was originally 10 x 20 x 11.2 cubits, or about 5.25 m x 10.5 m x 6 m, comprising a double 10x10 cubit square, and a height equal to half the double square's diagonal. Some believe that this is consistent with the geometric methods for determining the Golden Ratio φ (phi), which can be derived from other dimensions of the pyramid, such that if φ had been the design objective, then π automatically follows to 'square the circle'.

The sarcophagus of the King's Chamber was hollowed out of a single piece of Red Aswan granite and has been found to be too large to fit through the passageway leading to the chamber. Whether the sarcophagus was ever intended to house a body is unknown. It is too short to accommodate a medium height individual without the bending of the knees, a technique not practiced in Egyptian burial, and no lid was ever found. The King's Chamber contains two small shafts that ascend out of the pyramid. These shafts were once thought to have been used for ventilation, but this idea was eventually abandoned leaving Egyptologists to now conclude they were instead used for ceremonial purposes. It is now thought that they were to allow the Pharaoh's spirit to rise up and out to heaven.

Queen's Chamber

The Queens Chamber has a similar pair of shafts, which were explored using a robot, Upuaut 2, created by the German engineer Rudolf Gantenbrink. In 1992, Upuaut 2 discovered that these shafts were blocked by limestone "doors" with two eroded copper handles. The National Geographic Society filmed the drilling of a small hole in the southern door only to find another larger door behind it. The northern passage, which was harder to navigate due to twists and turns, was also found to be blocked by a door. The Queen's Chamber is the middle and the smallest, measuring approximately 5.74 by 5.23 metres, and 4.57 metres in height. Its eastern wall has a large angular doorway or niche, Egyptologist Mark Lehner believes that the Queen's chamber was intended as a serdab, a structure found in several other Egyptian pyramids, and that the niche would have contained a statue of the interred. The Ancient Egyptians believed that the statue would serve as a "back up" vessel for the Ka of the Pharaoh, should the original mummified body be destroyed. The true purpose of the chamber, however, remains uncertain.

Unfinished chamber

The "unfinished chamber" lies 90 ft below ground level and is rough-hewn, lacking the precision of the other chambers. This chamber is dismissed by Egyptologists as being nothing more than a simple change in plans in which they believe it was intended to be the original burial chamber but later King Khufu changed his mind wanting it to be higher up in the pyramid.

Pyramid complex

The Great Pyramid of Giza is the main part of a complex setting of buildings that included two mortuary temples in honor of Khufu (one close to the pyramid and one near the Nile), three smaller pyramids for Khufu's wives, an even smaller "satellite" pyramid, a raised causeway connecting the two temples, and small mastaba tombs surrounding the pyramid for nobles. One of the small pyramids contains the tomb of queen Hetepheres (discovered in 1925), sister and wife of Sneferu and the mother of Khufu. There was a town for the workers of Giza, including a cemetery, bakeries, a beer factory and a copper smelting complex. A few hundred metres south-west of the Great Pyramid lies the slightly smaller Pyramid of Khafre, one of Khufu's successors who is also commonly considered the builder of the Great Sphinx, and a few hundred metres further south-west is the Pyramid of Menkaure, Khafre's successor, which is about half as tall. In May 1954, 41 blocking stones were uncovered close to the south side of the Great Pyramid. They covered a 30.8 meter long rock-cut pit that contained the remains of a 43 meter long ship of cedar wood. In antiquity, it had been dismantled into 650 parts comprising 1224 pieces. This funeral boat of Khufu has been reconstructed and is now housed in a museum on the site of its discovery. A second boat pit was later discovered nearby.

Media

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See also

• List of Egypt-related topics
• World's tallest free standing structure on land
• Pyramid inch

Notes

1. Edgar, John & Morton, Great Pyramid Passages and Chambers - (1923)
2. ^ Oakes & Gahlin (2002) p.66.
3. Shaw (2003) p.89.
4. Dilke (1987) pp.9,23.
5. Levy (2005) p.17.
6. ^ Petrie (1883).
7. Collins (2001) p.234.
8. Verner (2003) p.70.
9. Verner (2001) pp.75-82.
10. Calter (2008) pp. 156-171, 548-551.
11. ^ Oakes & Gahlin (2002) p.67.
12. National Geographic News: Ancient Egyptian Chambers Explored.
13. National Geographic News: Third "Door" Found in Great Pyramid.
14. Corporation for Public Broadcasting: Unfinished Chamber.
15. Clayton (1994) pp.48-49.

References

• The Pyramids and Temples of Gizeh by Sir William Matthew Flinders Petrie (1883) ISBN 0710307098.
• Mathematics and Measurement by O.A.W. Dilke (1992) ISBN 0520060725.
• Chronicle of the Pharaohs by Peter A. Clayton (1994) ISBN0-500-05074-0.
• The Oxford Encyclopedia of Ancient Egypt edited by Dana M Collins (2001) ISBN 9780195102345.
• The Pyramids: The Mystery, Culture, and Science of Egypt's Great Monuments by Miroslav Verner (2001) ISBN 0-8021-1703-1.
• Ancient Egypt by Lorana Oakes and Lucia Gahlin (2002) ISBN 1-84309-429-0.
• The Oxford History of Ancient Egypt by Ian Shaw (2003) ISBN 0198150342.
• The Pyramids by Miroslav Verner (2003) ISBN 1843541718.
• The Great Pyramid of Giza: Measuring Length, Area, Volume, and Angles by Janey Levy (2005) ISBN 1404260595.
• Squaring the Circle: Geometry in Art and Architecture by Paul A. Calter (2008) ISBN 1-930190-82-4.

External links

• Belless, Stephen. "The Upuaut Project Homepage". Upuaut Project. Retrieved 2008-04-01. {{cite web}}: Cite has empty unknown parameters: |accessdaymonth=, |month=, |accessyear=, |accessmonthday=, and |coauthors= (help)

• Clemmons, Maureen. "How Many Caltechers Does It Take to Raise An Egyptian Obelisk?". Caltech News. Retrieved 2008-04-01. {{cite web}}: Cite has empty unknown parameters: |accessdaymonth=, |month=, |accessyear=, |accessmonthday=, and |coauthors= (help)

• "The Giza Mapping Project". Oriental Institute. Retrieved 2008-04-01. {{cite web}}: Cite has empty unknown parameters: |accessdaymonth=, |month=, |accessyear=, |accessmonthday=, and |coauthors= (help)

• Hawass, Dr. Zahi. "How Old are the Pyramids?". Ancient Egypt Research Associates. Retrieved 2008-04-01. {{cite web}}: Cite has empty unknown parameters: |accessdaymonth=, |month=, |accessyear=, |accessmonthday=, and |coauthors= (help)

29°58′45.03″N 31°08′03.69″E / 29.9791750°N 31.1343583°E / 29.9791750; 31.1343583

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• 26th century BC architecture
• Giza Plateau
• Ancient Egyptian pyramids
• Former world's tallest buildings