'Unique' astronomical object reveals Ancient Egyptians kept close tabs on the Big Dipper
New research on a 2,400 year old star table shows that the Ancient Egyptians kept close tabs on the Big Dipper, monitoring changes in the constellation’s orientation throughout the course of an entire year.
The Big Dipper is composed of seven stars and is easily viewable in the northern hemisphere. Its shape looks like a ladle with a scoop attached. Ancient Egyptians represented it as an ox’s foreleg.
If a person were to observe the constellation at the exact same time every night they would see it gradually move counter-clockwise each time they saw it.
Professor Sarah Symons, of McMaster University in Hamilton Canada, carried out the new research. She presented her results on Sunday at an Egyptology symposium in Toronto. The star table she analyzed is located inside the lid of a 2,400 year old granite sarcophagus, constructed in the shape of a bull, which is now in the Egyptian Museum. The table is, “unique, though interesting, a very provocative astronomical object,” she said.
Indeed the sarcophagus dates to the 30th dynasty, an important period in Egyptian history. It is the last point of time in antiquity where Egypt would be ruled by native born rulers. In 343 BC the Persians took over Egypt, defeating a pharaoh named Nectanebo II and forcing him to flee south into Nubia. The country would remain under Persian control until Alexander the Great captured it in 332 BC, inaugurating a long line of Greek, followed by Roman, rulers.
Monitoring the Big Dipper
Inside the sarcophagus there is an astronomical table, a section of which has rows that show the foreleg of an ox in a wide range of different positions. “It’s quite a jumble,” Professor Symons said.
This section, although confusing to read, includes notation for the three Egyptian seasons, Akhet, Peret and Shemu. Each season is broken down into four months. It also has symbols representing the beginning, middle and end of the night – although it isn’t known at what exact time these points would have been set.
“(Its) location throughout the course of the night, across the course of the year, was important for them to report.”
Symons decided to focus on the orientation of the forelegs, re-drawing them as arrows. When she did this a pattern started to appear. “In general the motion that it follows is the counter-clockwise motion that we would expect.”
But there were problems. Over the course of a year the forelegs sometimes went the wrong way – as if the stars had stopped obeying the rules of astronomy. She believes that this was a scribal error, caused by someone writing down the information in the wrong format.
When the observations were first made they were written on papyrus and the months were probably organized into columns. On the other hand they were written in as rows on the sarcophagus.
“What happens to our table if we just keep all the months together?” And work with them as columns, she wondered. She found that the table had fewer errors and the information fell into place. “Overall the motion is counter-clockwise throughout the year in general,” she said.
An ancient record
This table, she said in an interview, it not made up of casual observations of the Big Dipper but “looks more like a record of it.” The Big Dipper's “location throughout the course of the night, across the course of the year, was important for them to report.”
She added that this practice, of recording the orientation of the constellation, may have been going on for some time. “We have only a fraction of the original astronomical documents,” created by the Egyptians, she pointed out.
Why they created this year-long record is another matter. Although it would have been of help in timekeeping, Symons thinks that the main reason is probably ceremonial – perhaps something to do with the bull shaped sarcophagus that it is found in. The star record “would be bound up with temple ritual (and) mortuary ritual," she said.
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Focus on
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ancient london, british museum, roman, art, zahi hawass, london, ancient egypt, religion, burial, valley of the kings
Next major 'ancient' exhibition in London:
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November 2010 - March 2011
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Comments
www.arky.eu
Yes, this is the sarcophagus mentioned by Neugebauer and Parker in their book on Egyptian astronomical texts. They mentioned that it was outside in the garden of the museum, so it's good to hear it has not been lost or damaged.
The Plough was of course used by the Egyptians for the alignment of their royal tombs and temples to the cardinal directions, including the pyramids.
David Ian Lightbody
University of Glasgow
I proposed that very same idea in my book The Egypt Code (Century Books, 2006), and also in a TV documentary 'Egypt Decoded' (History Channel 2006).
The Big Dipper was monitored by the ancient Egyptians since at least the Pyramid Age, as it is mentioned in the Pyramid Texts. The first depiction of this asterism in Egypt dates from c. 1900 BC on the lid of wodden sarchophagi from Assiut. It is well known that the stars of the Big Dipper were used in the ceremony of the 'stretching the cord' to align pyramids and temples.
In my book The Egypt Code I proposed that the Big Dipper was tracked daily as well as seasonally, used as a 'star clock' to mark the hours and the seasons. It was also probably tracked to mark the rising of Sirius.
Robert Bauval
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She added that this practice, of recording the orientation of the constellation, may have been going on for some time. “We have only a fraction of the original astronomical documents,” created by the Egyptians, she pointed out.
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