The Orion Mystery: Unlocking the Secrets of the Pyramids

by Robert Bauval, Adrian Gilbert

This fascinating archaeological detective story argues that the great pyramids of Egypt's Fourth Dynasty (c. 2600-2400 b.c.) were vast astronomically sophisticated temples, rather than the pharaonic tombs depicted by conventional Egyptology. In March 1993, a tiny remote-controlled robot created by Rudolf Gantenbrink, a German robotics engineer, traveled up airshafts within the Great Pyramid of Giza and relayed to scientists video pictures of a hitherto unknown sealed door within the pyramid. Bauval, a British engineer and writer who has been investigating the pyramids for more than ten years, and Gilbert, a British publishing consultant, use Gantenbrink's tantalizing discovery as a launching pad for an extended analysis of the purpose of the mysterious airshafts, which lead from the Great Pyramid's chambers to its exterior, and of the placement of other Fourth Dynasty pyramids. They were sited, the authors argue, to coincide with the key stars of Orion, a constellation that had religious significance for the Egyptians. Bauval and Gilbert claim that the shafts were pointed directly at important stars in Orion--that is, at those stars as they were placed in ancient times. Using astronomical data about stellar movement, they argue that the Orion stars coincide exactly with the pyramids' positions in approximately 10,400 b.c.--a period the Egyptians called the First Time, when they believed the god Osiris ruled the Earth. The authors also speculate that the mysterious space within the Great Pyramid discovered by Gantenbrink contains the mythical Benben stone, which the Egyptians linked to the creation of the world. The book's contentions are sometimes far-fetched and certainly unlikely to put scholarly controversy about the pyramids to rest. Still, this is an enjoyably radical rethinking of the mystery of the pyramids, with some ingenious arguments made in lucid style.

A revolutionary book that explains the most enigmatic and fascinating wonder of the ancient world: the Pyramids of Egypt. "[An] absorbing and fascinating work of archaeological detection...clearly and rivetingly told...the book is highly and compulsively readable."--London Sunday Times. 16-page black-and-white inserts.

Genres: History, Nonfiction, Egypt, Science, Ancient History, Religion, Archaeology

325 pages, Paperback

First published October 1, 1993

About the author

Robert Bauval was born in Egypt in 1948. A construction engineer, his interest in Egyptology is longstanding, having lived in Egypt and elsewhere in the Middle East for much of his life. In the 1980s, he developed a line of study linking the pyramids and the so-called Pyramid Texts with astronomy and famously published the best-selling The Orion Mystery. He has also written three books with best-selling author Graham Hancock (The Message of the Sphinx, Talisman, and The Mars Mystery).

Reviews

[Paul · Rating 4 out of 5]

My personal introduction to the Great Pyramid of Giza was in January 1982, when I traveled to Egypt. At that time there were few tourists, so I made my way alone up the Grand Gallery, mysterious, massive, and steep inside the man-made mountain, and for a time stood alone in the King's Chamber at its top. I was surprised to find the chamber so plain--no hieroglyphics, no carvings. It was like standing in a damp, dim concrete room, like a change-room at a public swimming pool, with the big, plain stone "sarcophagus" looking more like a broken watering trough for livestock. In short, the chamber, like the rest of the innards of the Pyramid, suggested a feeling of functionality, even if it was impossible to guess what that function was.

Fast-forward to March 1994. Browsing through the shelves of Westernesse, a used bookstore here in North Vancouver, I came across, in their "new" section, a copy of the Element Classic Edition of The Great Pyramid Decoded by Peter Lemesurier. Intrigued by the book's high quality, detailed illustrations, and unconventional viewpoint, I bought it ($24.95--expensive at the time). I started reading and quickly became fascinated and excited. It was the first I'd ever heard of the phenomenal physical properties of the Pyramid and its encoding of a number of mathematical and astronomical quantities and proportions, including approximations of pi and phi (the irrational quantity that generates the Golden Section), accurate lengths of the tropical, sidereal, and anomalistic years, and accurate representations of the Earth's polar and equatorial radii--among many other things. I was astonished, electrified. I had no difficulty believing the author's contention that the Great Pyramid was something vastly more and vastly other than the mere tomb of a vainglorious king--one whose body was never found in the monument.

I came to see the Great Pyramid as the single greatest puzzle on Earth, the greatest monument to the question of human origins and destiny. We have forgotten the purpose of the most marvelous and stupendous structure ever built. What does that say about us?

Since the collapse of the Egyptian civilization a shroud of ignorance has fallen over Giza. The Pyramid's brilliant white casing stones have been stripped from its surface, perhaps to build mosques in Cairo, and people have dynamited their way into the Pyramid in their lust for treasure. (What does that say about us?)

In the following years I dug further into the question, reading works by John Anthony West, R. A. Schwaller de Lubicz, and Graham Hancock. My first encounter with the work of Robert Bauval was in his role as coauthor, with Graham Hancock, of The Message of the Sphinx, which came out in 1996, two years after The Orion Mystery. (The Sphinx is perhaps an even greater mystery than the Great Pyramid.) Since that book already took account of the discoveries documented in The Orion Mystery, I didn't bother to get the latter book. But something (I forget what) flagged my attention back to the earlier book, and I ordered a copy.

I'm glad I did. Bauval, a native of Alexandria and a civil engineer by trade, is the antithesis of a New Age crackpot. Cautious, objective, and humble, he provides a good "outsider's" view of the standard theories about the Pyramids, showing good familiarity with the various people and texts that have presented these. For the New Age may have its crackpots, but orthodox, mainstream Egyptology has no shortage of its own. And in any field where there are such large gaps in the factual knowledge, there is no doubt a greater danger that scholarly consensus will be mistaken for truth. Egyptology needs fresh thinking, new ideas--it needs more Robert Bauvals instead of dismissing them as "pyramidiots," one of the actual terms used by Egyptologists.

The book is a narration of how Bauval developed his own theory of the origin and purpose of the Egyptian pyramids. Quite a bit of it is concerned with the details of his efforts to get more information and his dealings with professional Egyptologists, most of whom were dismissive of his ideas. There were important exceptions, though, such as the warmth and interest he was shown by I. E. S. Edwards, octogenarian former Keeper of Egyptian Antiquities at the British Museum--the more important because he was regarded by many as the foremost authority on the Egyptian pyramids.

Bauval's theory is that the complex of pyramids of the Fourth Dynasty was conceived and built as whole: a gigantic, multigenerational megaproject. They, along with the river Nile and the ancient cities of Heliopolis and Letopolis, mapped a portion of the heavens, and served specific funerary functions, although they were not tombs of individual pharaohs. Rather, they were a system to ensure the flight of the dead pharaoh's soul to the stars, and his rebirth as the next pharaoh.

I won't say more about the specifics so as not to spoil the reading, journey, which does indeed read something like a mystery. The account of Bauval's discovery of the correlation between the Giza pyramids and the belt of Orion is delightful and authentic. Adrian Gilbert, listed as coauthor, is an English publisher with whom Bauval joined forces when they discovered a shared interest in the pyramids. It seems that Gilbert provided organizational, research, and editorial help to a project that was really Bauval's. The book is narrated in Bauval's voice.

I learned a lot of new things in The Orion Mystery, and I say this as someone who has studied the Great Pyramid more than casually over the years. I suppose I would sum things up thus: if you're interested in the mystery of the Great Pyramid of Giza, then this book is required reading for you. And if you're not interested, you should be.

[Gohnar23 · Rating 4 out of 5]

This book is not even 250+ pages, goodreads really does sometimes put misinformation in the number of pages.

Anyways this book is pretty good! It very much expanded my knowledge on the mysteries that surrounds formations in the egyptian territory and their histories. 🍀

(I thought this was a fiction book) :|

[Robert Snow · Rating 5 out of 5]

Bauval and Gilbert turns Egyptology on its ear with a trip to the Arabian desert with his friend. There he (Bauval) looks at the night sky and from there he changes to way we look at ancient Egypt. This is a page turner and an absolute fascinating read. I have recommended this book to more people and all have come back with "What a great read." If you want to learn something new and get out of the same old boring read... this is it!

[George Mills · Rating 4 out of 5]

Even though some parts of his theories may be shown to be incorrect - all merit careful study & review. This is not 'new age' or 'beings from space' stuff. His observations are exact and accepted by many astronomers. Egyptologists must leave their pride behind and work openly with the other sciences. We are constantly forced to rewrite the history of the 20th Century based on new observations and discoveries. Why should we think that we have no need to do the same for things that happened over 4 millennia ago?

[Gus Scott-Exley · Rating 4 out of 5]

Not a bad book although there is a lot of evidence that discredits this book since it's release but it still has some interesting ideas and is worth the price of admission.

[Grey Wolf · Rating 5 out of 5]

Robert Bauval is a man I respect greatly and this seminal work of his sets up almost the entirety of his career. Until I read any of his, and Hancock's work, I had no idea about the passages in the pyramids, their alignment with the stars, which stars, the ceremonies associated with them and even about precession. It was a delight of a book and even for those who now think they know all this stuff through shows such as Ancient Aliens, I would recommend them to go back and read it and rediscover the original serious scholarship.

[Sherrill · Rating 3 out of 5]

I never realized how versed the ancients were in math and how they calculated everything with the planets. They were geniuses of the universe. They loved everything that had to do with the planets and they were so good at their calculations and they were very good at their calculations. It was a real adventure to read this book and to imagine how they lived and worked. They author had a great understanding of the life they lived and translated their ancient papyrus. This was a real revelation to me

[Jessica · Rating 4 out of 5]

I'm glad the notion of slaves stacking megalithic rock with rope and arm strength is being questioned. The fact that right now at this time we would not be able to build a pyramid with the technology available makes it inconceivable that a primitive culture could have built the pyramids. Our notions of the linear progress of human kind is questioned here.

[Sobia Be · Rating 5 out of 5]

knowledgable
eye opener into egyptology...love it

[E.j. Kay · Rating 3 out of 5]

Clearly written by someone who is committed to his theory, and he backs it up with evidence quite well. Maybe a few too many leaps of logic, though.

[Steven · Rating 5 out of 5]

Really enjoyed this. Nicely written and a very interesting hypothesis

[MENNA · Rating 4 out of 5]

amazing <3 !!

[Sobia Makhdoom · Rating 4 out of 5]

Insightful. It must have been extremely exciting for the author to discover the connections between the monuments and astronomy. the tale becomes dull and too mechanical at some points but also gives insights into many interesting discoveries along the way, for the Egyptology enthusiasts.

[Bradley Knight · Rating 4 out of 5]

**The Orion Mystery: Unlocking the Secrets of the Pyramids**
★ ★ ★ ★ ☆

I’ve always been obsessed with ancient history—the kind that makes you stare at the night sky and wonder how much we’ve been told is wrong. Egypt, in particular, feels like a locked vault: How old is it really? What were the pyramids *for*? Why do we keep finding precision in stone that defies everything we think we know about “primitive” cultures? I’m a Graham Hancock devotee, a lover of alternative theories and cosmic wisdom, so when I heard about *The Orion Mystery* by Robert Bauval and Adrian Gilbert, I knew it was right up my alley. This book didn’t disappoint—it expanded my mind in ways a five-minute YouTube clip never could, building an airtight case that the Giza pyramids are far older than the mainstream 2500 BCE timeline insists, pointing instead to a lost Ice Age civilization around 10,500 BCE.

At its core, the book revolves around the **Orion Correlation Theory**, proposing that the three pyramids of Giza were deliberately laid out to mirror the belt stars of Orion (Alnitak, Alnilam, and Mintaka) as they appeared around 10,500 BCE—due to the slow wobble of Earth's precession, which shifts the stars' positions over millennia. But it’s not just the ground plan—Bauval and Gilbert dive deep into the **pyramid shafts**, those narrow, precisely angled tunnels pointing directly at key stars like Sirius (linked to the goddess Isis) and the Orion constellation. When you combine the ground alignment with the shaft targeting, the statistical probability of coincidence collapses. Add in the precessional timing—how the sky looked *exactly* like that over 12,000 years ago—and it becomes impossible to dismiss as random. This isn't some abstract star-gazing; it's a deliberate "as above, so below" blueprint etched in stone, suggesting the builders had advanced astronomical knowledge to encode the heavens on Earth.

What truly sealed the deal for me was the avalanche of supporting data that screams "ancient"—way beyond 2500 BCE. The Great Pyramid’s latitude (29.9792° N) matches the speed of light in a vacuum (299,792 km/s)—a number encoded into its very coordinates, baffling for a culture supposedly without modern science. Its height-to-perimeter ratio scales perfectly to the Earth’s polar radius and equatorial circumference, while the base perimeter divided by twice the height gives you π to several decimal places. The entire structure aligns with true north to within 3/60th of a degree, a precision unmatched until the 19th century. No mummies were ever found in the major pyramids, despite their "tomb" label—zero royal burials, zero grave goods. The King’s Chamber resonates at specific frequencies, hinting at acoustic engineering. The Giza plateau aligns not just with Orion, but with the Nile mimicking the Milky Way, and the Sphinx (with its water erosion patterns suggesting heavy rainfall last seen around 7000–5000 BCE) gazing eastward toward the vernal equinox sunrise in Leo circa 10,500 BCE. Bauval and Gilbert lay it all out, piece by interlocking piece, like a cosmic jigsaw puzzle. As Graham Hancock powerfully articulates in his discussions on ancient alignments (echoing his core thesis across *Fingerprints of the Gods* and recent talks like his Lex Fridman podcast), "The Sphinx and the Great Pyramids... the astronomy... the layout and orientation of the Sphinx, the Giza pyramid complex and the Nile River are an accurate reflection or 'map' of the constellations of Leo, Orion’s Belt, and the Milky Way" from that Ice Age epoch—evidence of a "lost civilization" whose knowledge was passed down after a cataclysmic Younger Dryas event around 12,900 years ago. Hancock's famous emphasis on this "amnesia" in human history—that we’ve forgotten our advanced ancestors—fuels the fire: the pyramids aren't just tombs; they're initiatory machines, star maps, and time capsules challenging the entire narrative of linear progress.

Stack this with broader evidence for extreme antiquity: Radiocarbon dating of organic inclusions in the pyramid mortar yields dates averaging 2871–2604 BCE, but alternative analyses (like those from the 1984 Edgar Cayce Foundation study) push clusters to 3809–2853 BCE or earlier, with outliers suggesting reused materials from an even older core structure. The Sphinx's enclosure shows vertical precipitation erosion inconsistent with desert winds but matching heavy rains from a wetter Sahara around 10,000–5000 BCE, as geologist Robert Schoch argues—implying the whole Giza complex predates dynastic Egypt. No hieroglyphs adorn the interiors, unlike later pyramids, hinting at a non-Egyptian origin. And the precision? Granite beams in the relieving chambers cut so flawlessly they fit without mortar, with tolerances under 0.5 mm—beyond Bronze Age tools. When you layer in global parallels (like Göbekli Tepe's 11,600-year-old megaliths), it paints a picture of a pre-flood world far more sophisticated than we've been taught.

My favorite section was the detailed exploration of **Giza’s layout**—how the three pyramids, the Sphinx, and even the surrounding temples form a deliberate astronomical map. The diagrams are clear, the measurements meticulous, and the implications staggering. But here’s where I’ll be honest: Bauval doesn’t fully address that the Orion belt must be **flipped** (mirrored) to match the pyramid layout on the ground. He hints at the “as above, so below” hermetic principle—Earth as a reflection of the heavens—but doesn’t lean into the mirror issue head-on. I get it; ancient sky maps were often inverted. But a little more transparency would’ve strengthened the argument. That said, it’s not a dealbreaker. A mirror *is* a mirror. I'm about 75% sold on the full "mirror of the heavens" idea—solid investigative journalism, even if 25% feels speculative.

The writing style is the reason this isn’t a five-star read. Parts are **dense**—like trying to read a technical paper after midnight. You *cannot* be sleepy. You’ll blink, miss a paragraph, and have to backtrack three pages. It demands full attention, which is both a strength (the depth is real) and a flaw (it’s not always reader-friendly). I had to reread sections multiple times, especially the astronomical calculations. But the payoff? Worth it.

You don’t need prior knowledge to enjoy this, but you’ll get *way* more out of it if you’ve already been inducted into alternative history—start with Hancock’s *Fingerprints of the Gods*, then come here. This isn’t light bedtime reading; it’s a deep dive into a paradigm-shifting idea.

What lingers with me is the growing suspicion of a **grand cover-up**. When you stack this book alongside evidence for water erosion on the Sphinx (suggesting a far older origin), the precision of megalithic construction worldwide, and the stubborn refusal of mainstream Egyptology to update its 150-year-old timeline despite mounting contradictions—it’s clear we know **fuck all** about our past. A hypothesis was made over a century ago, and they’ve been forcing all new data to fit it ever since, ignoring precessional alignments and erosion that scream Ice Age origins. *The Orion Mystery* doesn’t just challenge that—it blows a hole in it.

**Four stars**: one knocked off for the occasionally impenetrable prose. But the research is rock-solid, the thinking is fearless, and the implications are profound. If you’re a fan of Graham Hancock, ancient astronomy, or just sick of being told “we figured it all out,” read this. Just do it with a clear head and an open mind. Your view of history will never be the same.

[Erik Graff · Rating 4 out of 5]

It is pretty easy to summarize the conclusion of this book. Basically, it's that the configuration of the Egyptian pyramids--and there are dozens of them known--and temples and some of their components bear a direct correspondence to stellar positions. In other words, the ancient Egyptians, taking the Nile as their baseline, mapped the heavens and seasons upon the earth, this mapping suggesting a good deal not only about their belief system, but also providing many testable hypotheses for not only dating known structures but also for seeking lost ones. In addition, the authors provide a first-hand account of the results of the Upuaut robot-probe investigations of the four angled shafts leading from the two upper chambers of the Great Pyramid often attributed to Khufu.

Other than a rather mediocre prose-style, my only objections to this book are:
1. The references to Edgar Cayce which are alluded to in passing.
2. The vague references to evidences suggesting that a radical redating of some of the monuments may be in order.
3. The unexamined assumption that the pyramids served originally as tombs when, in fact, there has been no hard evidence for this hypothesis.
4. The lack of serious reference to the building complexes within which some, if not all, of the pyramids were located, particularly to the sphinx associated with the Giza complex.

Perhaps, however, it was best that the authors avoided these ancillary considerations in order to get their primary thesis across. That they do rather convincingly.

[Devero · Rating 5 out of 5]

Adrian Gilbert è coautore con Robert Bauval di questo saggio, ma la sua presenza non riesce a traviare l'opera dell'ingegner Bauval, che ha base solide e uno scetticismo di fondo. Altri, tra cui Gilbert, Hancock ed una serie quasi innumerabile di nomi, hanno preso e fantasticato i dati esposti in questo saggio. Bauval non dice che le piramidi di Giza hanno 10mila anni. Dice che gli antichi egizi le costruirono come immagine terrestre della cintura di Orione, il dwat celeste. Afferma anche che conoscevano il moto astronomico della precessione degli equinozi e per qualche ignoto motivo, forse puramente religioso o speculativo, credevano che l'epoca in cui l'universo aveva avuto inizio fosse quella in cui la levata eliaca della cintura di Orione fosse al punto più meridionale del cielo. Non che le piramidi fossero state costruite a quell'epoca.

Anche se sono trascorsi 16 anni da quando lo lessi per la prima volta, il senso profondo di curiosità di Bauval che lo portò a esplorare un campo in parte diverso dal suo è ancora, ai miei occhi, degno di ammirazione, a differenza delle opere degli sfruttatori fantarcheologi suoi epigoni.

[Vera · Rating 3 out of 5]

A fascinating discussion of the real purpose of the pyramids, this book nearly convinces me that the mainline historians are wrong. However, since I lack any knowledge of whether the facts given in this book are anywhere near correct I can only say his theory makes more sense to me than the idea that the pyramids were built to house the bones of only one man. Some of the math was beyond me, or maybe just what I was willing to expend, given the time since my last college math course. Ditto for the astronomy, although the basics seemed reasonable. Interesting read and discussion of ancient Egyptian
religion.

[Jonathan · Rating 3 out of 5]

Interesting take on the design of the pyramids that seems to make sense. I would not say it should replace the idea that they are tombs but it seems likely that they served duel purposes. The idea of a solar cult seems less likely than their being used in a stellar/Osiris cult. After all what better use for a tomb than as an observatory for the god of the dead?

[Rene's Wereld · Rating 3 out of 5]

Robert Bauval geeft in dit boek een totale en revolutionaire kijk op de bouw en gebruik van de piramides.
We hebben altijd geleerd dat de piramides als graftombes gebruikt werden, maar Robert geeft een zeer goed onderbouwd inzicht in het werkelijke gebruik. Een poort naar het hiernamaals, het dodenrijk van de Egyptenaren

[Anton · Rating 4 out of 5]

Absolutely fascinating. Pretty tough read with all the numbers and math involved, but if you're able to get past that, you get a really nice look at the science behind the way the Great Pyramids of Egypt were built.

[Dave Umrysh · Rating 4 out of 5]

Even though the book was originally published over 20 years ago and therefore the main topics are now common knowledge, I still found quite a few tidbits I had not ever come across before. The author argues his opinions very well and backs up his claims with solid references. Very well written.

[Jose M. · Rating 4 out of 5]

No es una novela sino un relato tremendamente interesante sobre los estudios del autor acerca de la conexión de las construcciones egipcias y la astronomía de hace 4500 años. No es un libro fácil de leer, hay que afrontarlo con interés sobre el tema y con lectura tranquila y concentrada.

[K115987 · Rating 3 out of 5]

Ho creduto fermamente in questo libro, ho creduto che la Fantarcheologia non fosse così "fanta". Poi sono stata in Egitto, quello vero, e la verità mi ha schiaffeggiato. In faccia. A mano aperta.
Comunque un buon guilty pleasure.

[Peter · Rating 2 out of 5]

The Ancient Egyptians were astrologers and mapped out the belt of Orion and other stellar bodies. The pyramids and their internal structures are that map.
No Honestly!

[Prashant · Rating 3 out of 5]

Some of the conclusions are difficult to agree with, and there are some blindingly obvious mistakes, but overall a fascinating read.

[Dennis · Rating 5 out of 5]

Fascinating. This book is highly and compulsively readable. Great take on the Pyramids.

[Catherine Shereshewsky · Rating 4 out of 5]

A really good read

Lots of info, lots of facts clearly distinguished from theories. Totally enjoyable. Interested in how academics make big mistakes? Look no further.

[Fefi · Rating 4 out of 5]

Libretto che toglie un po' di curiosità sui misteri delle piramidi, ma l'Egitto per me resterà sempre un gran bel mistero!

[Roberto Charvel · Rating 3 out of 5]

A good friend of mine gave me this book almost 10 years ago. He had gone to Egypt with his family and wanted to share part of the excitement of the trip. What was very original about his trip was the approach his family took regarding who guided them through Egypt and its millennial culture. They were able to hire Robert Bauval who wrote this book.

From what I understand, this is just part of Robert's voyage of unearthing Egypt's secrets. Some of his latter work seem to become more radical in notions and approach questioning how old the pyramids are. Without having read those books, I can tell that the thesis in the Orion Mystery is well defined and supported over the entire book.

The thesis is that Egypt's religion is not about the sun like it was thought since the Champoleon expedition, but that the religion is a start based one and more specifically based on the Orion galaxy. The evidence seems to be indisputable and has to be with the orientation of the three Great Pyramids.

The books goes a step further and tries to prove that all pyramids and other constructions on Egypt were part of a centrally planed project that wanted to replicate the milky way and specifically the Orion Galaxy. The mathematical and architectural evidence seem to be strong and very credible. I specially enjoyed how they were able to calculate when the pyramids were built by going back in time to see when they matched the Orion main starts. This opened the discussion about the pyramids being also a sort of time keeper or galactic clock.

Apart from the different arguments on Egypt's history, the book is a great introduction for anyone interested in learning about Egypt cosmo vision and fall in love with your early dreams about discovering ruins and secrets that have been dormant for millennia. There is a particularly beautiful passage where the author is able to explain how Egyptians thought that the Nile was a representation of the Milky Way on earth. That image really spurred my imagination about how many marvels we have not been able to identify that make us better understand and even share desires or images with people that lived thousands of years ago.

[Strong Extraordinary Dreams · Rating 3 out of 5]

Well, it's kinda boring. I mean, how can such an interesting even fascinating subject be rendered into such a boring book. I had to skip pages. In reality, the this is a book of one fact (see below), with irrelevant (to me) or fundamental (to others) filler:
(1) Boring Egyptian god stories,
(2) the Egyptians' conceptual matching of the Nile and Pyramids with the Milky Way and specific stars (ok, that is kinda cool)

Big plus (from 2- to 3-stars) for being a book effectively EXACTLY answering a long-time question of mine:
Q: At which stars, and when, are the Great Pyramid's shafts aligned.
A: One at the central star of Orion's belt, the other at Sirius, in 2745BC.