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I'm aware that Ancient Egyptians did chart stars and have a relatively robust understanding of astronomy for the time. However, did they (say, in the 2nd millenium BC) practice astrology, such that they believed the stars and planets reveal or could be affected by human activities? Or did this only come about later, when it was more Hellenistic?

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THis depends slightly on what you mean with Astrology. If you mean the practice of making Horoscopes that's one thing. If you mean that idea that what happens in the sky affects us on earth, that becomes a different answer. –  Lennart Regebro Jan 2 at 6:28
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@LennartRegebro actually making horoscopes is a product of the belief that what happens in the sky affects us on earth. I fail to see why that would need to be a different answer –  Jeroen K Jan 2 at 22:58
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@JeroenK: But it is not an automatic product of it. You can believe that lunar eclipses and novas etc are portents of doooom, without believing that each individual persons destiny depends on the position of the planets at the time of his/her birth. Both is astrology. Only one is horoscopes. –  Lennart Regebro Jan 3 at 5:37
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@LennartRegebro Astrology in the sense that you can read the stars to know what is happening on earth or what people are doing or what might happen. I'm not so concerned on exact practices like saying that everyone born under a specific constellation will have a given horoscope every day. Also, having a superstitious fear of disaster after a solar eclipse is not what I'm talking about here. –  Uncle Jan 3 at 5:57
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@Uncle - please edit your question to include the clarification in the comments; I'm still not convinced that contemporaries would be able to distinguish between astrology and astronomy; from their perspective they were studying the stars. –  Mark C. Wallace Jan 7 at 14:09

2 Answers 2

According to the main authoritiy on ancient astronomy and astrology, Otto Neugebauer, astrology was introduced to Hellenistic world from Babylon. (If you not know who he is, look at this Wikipedia article http://en.wikipedia.org/wiki/Otto_Neugebauer). Here is what he writes on Egypt in general:

Egypt provides us with the exceptional case of a highly sophisticated civilization which florished for many centuries without making a single contribution to the development of the exact sciences...

This strongly contradicts to what many other authors (ancient and modern) say about Egyptian astronomy and mathematics, but on my opinion, Neugebauer had really studied this question carefully, unlike those other authors. The legends about Egyptian math and astronomy come from the Ancient Greece, and later they were uncritically repeated by other authors. Modern research shows that these are really legends.

Moreover, Neugebauer, who was mostly interested in the history of astronomy, also carefully studied Hellenistic horoscopes, trying to find there interesting information about astronomical knowledge. He places the origin of astrology at about -1000 in Babylon. This "science" penetrated to the West (including Egypt) after Alexander's conquest.

His book (second reference below) contains an interesting graph showing the number of known Hellenistic horoscopes distributed by years. (A horoscope is relatively easy to date precisely from the information contained in it). According to this graph, there are none before the year -100, and the sharp maximum falls on the year 100, with sharp decrease by 200, and very sharp decrease around 500, when pagan science (including mathematics and astrology) was formally banned by Justinian.

It is true that most horoscopes are found in Egypt, but this was Hellenistic Egypt, and majority were in written Greek, with some in (demotic) Egyptian.

Sources: A brief but very informative account is O. Neugebauer, The exact sciences in antiquity, Harper torchbooks, 1962. A comprehensive source is O. Neugebauer, A History of Ancient mathematical astronomy, in 3 vols., Springer 1975.

EDIT. I address some comments on my answer. Very few serious scientists would spend their time to study such nonsense as horoscopes. Neugebauer and his collaborators are actually the only scientists whom I know who did this. Surviving Hellenistic astronomy sources are so scarce, that literally everything which came to us from that time was carefully combed for even the smallest hints of relevant information. Perhaps I am missing something, and will be grateful if someone gives a reference to another reliable study. This does not include astrologers themselves, of course:-)

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"Common knowledge ... is not always so common." You gave no links in your question, so I had no reason to know that Otto Neugebauer was a well-known expert outside my areas of expertise. I now agree that he is not a crank suspect, but everything else in my comment is still valid commentary. Perhaps a link in your next post would help a reader to understand better? If you edit to add a link, I will be enabled to un-downvote. –  Pieter Geerkens Jan 2 at 3:57
    
(1) ALL cranks advertise themselves as the expert on their subject, and their acolytes mime the statement. Your statement simply sounded like those of such acolytes, and I had no personal knowledge to recognize it as valid. (2) After 5 minutes, I am not allowed to remove my downvote unless and until the post is subsequently edited. (3) I am quite willing to repost my comment without the final sentence, and was intending to do so after removing the down-vote. It didn't seem necessary to state that explicitly. –  Pieter Geerkens Jan 2 at 4:05
    
First warning sign for crank science: a tight loop of self-references; reason is that it is exceptionally unusual, almost impossible, for anyone to be so far ahead of all peers as to be the only expert in an area. The only exception I can think of is Gauss, partly because of his astounding ability, and also because he didn't publish for decades. Fortunately, Otto Neugbauer is not such a crank, but rather a widely accepted expert in this field. –  Pieter Geerkens Jan 2 at 4:07
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Ummm - some of the oldest documents we have from Egypt dealt with mathematics, astronomy and engineering. Neugbauer was disappointed with their practical nature, the "pure" pursuit of knowledge, in his mind, beginning with the Babylonians - it doesn't do a good job of answering the question. I'll work on another answer on the origins of Egyptian astrology and its integration with hellenistic astrology during the Ptolemaic period. –  RI Swamp Yankee Jan 2 at 13:22
    
RI Swamp Yankee: yes. It depends on what you call "math" and "science". From Neugebauer's point of view, this is pre-scientific level. Other people include to mathematics even the ability to count with fingers. This ability was present in all civilizations, I suppose. But if you can give references on Egyptian horoscopes before -100, it will be interesting. –  Alex Jan 2 at 15:55

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First off, in ancient cultures, astronomy and astrology were virtually the same discipline. There were certain practical aspects to the study of astronomy, particularly the measurement of time and the development of calendar systems, but outside of that, there was little or no abstract, scientific study of astronomy for its own sake:

Astronomy:

Astronomy is the oldest of the natural sciences, dating back to antiquity, with its origins in the religious, mythological, and astrological practices of pre-history: vestiges of these are still found in astrology, a discipline long interwoven with public and governmental astronomy, and not completely disentangled from it until a few centuries ago in the Western World (see astrology and astronomy). In some cultures astronomical data was used for astrological prognostication

Only at a relatively late period did the study of astronomy for its own sake begin to develop:

...A particularly important early development was the beginning of mathematical and scientific astronomy... The Babylonians discovered that lunar eclipses recurred in a repeating cycle known as a saros... Following the Babylonians, significant advances in astronomy were made in ancient Greece and the Hellenistic world...

So, if the ancient Egyptians were astronomers, we can be fairly certain they were also astrologers:

Astrology consists of several systems of divination based on the premise that there is a relationship between astronomical phenomena and events in the human world. Many cultures have attached importance to astronomical events, and the Indians, Chinese, and Mayans developed elaborate systems for predicting terrestrial events from celestial observations....

The very fascinating discipline of Archaeoastronomy has revealed that the ancient Egyptian temples and monuments were astronomically aligned:

The Orientation of Egyptian Temples:

The precise alignment of temples and pyramids was undoubtedly a result of astronomical observation. (A feature noticeably absent from Djoser's pyramid at Saqqara). Sir Norman Lockyer suggested that several of the great Egyptian temple complexes were orientated towards astronomically significant points on the horizon. His theories are disputed to this day even though there is now a substantial amount of supporting research in favour of his original suppositions...

A clear division can be identified between the orientation of ancient Egyptian temples of upper Egypt when compared with those of Lower Egypt. Lockyer (2), made note of the fact that whereas the early dynastic northern 'Memphite' pyramids, Giza pyramids, and Sphinx were orientated cardinally to face equinoxial phases of the solar cycle, the great temples in the south of Egypt, such as Karnack, the Colossi of Memnon and Abydoss, were all orientated to capture the suns rays on Solstice days of the year.

Nabta Playa: (Stone Circle):

Article - Science Daily 1998

An assembly of huge stone slabs found in Egypt's Sahara Desert that date from about 6,500 years to 6,000 years ago has been confirmed by scientists to be the oldest known astronomical alignment of megaliths in the world.

Known as Nabta, the site consists of a stone circle, a series of flat, tomb-like stone structures and five lines of standing and toppled megaliths. Located west of the Nile River in southern Egypt, Nabta predates Stonehenge and similar prehistoric sites around the world by about 1,000 years, said University of Colorado at Boulder astronomy Professor J. McKim Malville...

And much more there: Egyptian Astronomy

If so, it's quite clear that the Ancient Egyptians believed that there were intimate connections between their earthly activities and religious practices, and those of the visible heavens, as expressed in these many astronomically aligned structures: Divination based on the premise that there is a relationship between astronomical phenomena and events in the human world.

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Uh... I didn't realize you can infer from astronomically aligned objects that they thought they could read stars to know what is happening to people on earth. –  Uncle Jan 7 at 1:50
    
@Uncle - the reason they are astronomically aligned in particular ways has both practical (calendrical) and ritual significance. The key here is the ritual significance: these are not mere sundials-they are ritual structures. A temple to the Sun God, for example, is aligned with a certain aspect of the sun because that is the way that you "channel" the "energy" or "spirit" of your godhead to the temple, its worshipers, your nation etc. That directly implies a connection between the Sun and the Earth, etc. It's not horoscopes, but it is astrology, which in ancient times was bound to astronomy. –  user2590 Jan 7 at 2:02
    
@Uncle - see edit. –  user2590 Jan 7 at 2:26
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+1 for some good references; -1 for blatantly confusing concurrence with causality. –  Pieter Geerkens Jan 8 at 15:10
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@ComeAndGo: By that token you would make all Christian denominations astrologers also, since Christian churches are built with the altar to the east. Archaeoastronomy is a "field with academic work of high quality at one end but uncontrolled speculation bordering on lunacy at the other" as your reference above states, and you seem in a hurry to move from the beginning of that sentence to the end. –  Pieter Geerkens Jan 11 at 13:24

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