Tag: history of science

Dec 11 2025

Book review: Pathfinders – The Golden Age of Arabic Science by Jim Al-Khalili

I recently read Science and Islam by Ehsan Masood having struggled to decide whether to read it, or Pathfinders: The Golden Age of Arabic Science by Jim Al-Khalili – it turns out I read both. This is a review of Pathfinders. In reading al-Khalili’s book I was looking for a bit more science than Science and Islam offered.

Al-Khalili is an interesting author for this topic, he was born and raised in Baghdad so learnt something of Arabic Science through school – visiting some of the key sites and living in the city where the Golden Age started. He is also conscious of his separate Persian identity – his family are from Iran.

The book covers the history of the Islamic Empire briefly at the beginning before a series of thematic chapters finishing with one on the decline of Arabic Science during the early modern period and the rise of science in Europe during the Renaissance and a final chapter on Islam and Science in the modern era. As well as notes there are a couple of appendices: one a glossary of scientists, a handy addition with the number of scientists introduced in the book, and an interesting 2D timeline which showed both regimes (such as the Abbasids) and location (from Spain to Iran) which I found really helpful. In a break from my tradition, I reproduce it here.

Timeline: The Islamic World from Antiquity to the Beginning of the Modern Period from Pathfinders by Jim Al-Khalili

Much of the book is focussed on Baghdad where the translation project kicked off under the reign of the seventh Abbasid Caliph al-Ma’mun in the 9th century, alongside this a number of high profile Arab scientist worked, adding to that which they translated. There is an emphasis here on the translation from Persian and Indian sources as well as Greek. Al-Khalili sees the translation of Persian sources and those relating astrology as a bigger motivation than I think is commonly accepted.

I arrived at Pathfinders and Islam and Science by consulting my Bluesky followers, they favoured the Ehsan Masood book although Ehsan Masood liked Jim Al-Khalili’s book for his better access to Arabic sources. I can see why my history of science crowd were not so pleased with Pathfinders. In several places Al-Khalili casts aspersions on historians which I imagine is grating coming from a theoretical physicist and populariser of science.

Perhaps the most significant deviation from orthodoxy in his treatment of al-Ma’mun’s House of Wisdom. Al-Khalili tends to the strong view of it as a proto-University or research centre combining both a library and a workplace for scholars. The more mainstream view amongst historians gives it the status of a library, and on the other extreme there are those who doubt its very existence.

It’s difficult to do justice to the range of scientific subjects covered in Pathfinders, chapters include chemistry, astronomy (several times), numbers, algebra, philosophy, and medicine. Topics such as the invention of zero, and measurements of the size of the earth and optics are discussed in considerable technical detail.

The surprising thing for me was how long it took Arabic/Indian numbers to take hold in Europe (the French Audit Office was still using Roman numerals in the 18th century), and people like Simon Stevin, mathematician, were using their own odd formulation of decimal numbers in the 16th century. Some of this was due to a reluctance to use Arabic inventions apparently this also slowed the uptake of coffee in Western Europe.

Geber the Alchemist (Jabir ibn-Hayyan) gets a chapter pretty much of his own, Al-Khalili describes him as the founder of chemistry. His publication record is obscured by the fact that his name seems to have been attached as author to documents for several centuries after his death. What he actually wrote could be rather cryptic and it is from him that the English word “gibberish” comes. Jabir wrote on both chemistry and its mystical twin, alchemy. He appears to have attracted more opprobrium for this than Isaac Newton who also studied alchemy.

As an aside at the end of the chapter on physicists Al-Khalili points out that Al-Haytham, al-Razi and al-Biruni were using the scientific method long before it was supposedly invented in the early 17th century by Francis Bacon and Rene Descartes.

Although Baghdad was central in the early years of the Golden Age – the 9th and 10th centuries – later on Islamic Spain particularly Cordoba were important. Even after the Mongol sacking of Baghdad in 1256 observational astronomy continued by Arab scientists under Mongol rulers. Al-Khalili’s point here is that Arabic science continued beyond the traditional golden era and was only surpassed by Europe in the mid-fifteenth century. He sees the failure of printing in Arabic to take off as one of the reasons for its final decline. He notes that may have been due in part to an early printing of the Qur’an containing errors which would have been considered a serious offence.

Al-Khalili draws a parallel between the Abbasid translation effort, and the Renaissance translation work sponsored by the Medici family in Florence. Also important in bringing Greek and other works via Arabic was Toledo which became a Christian centre for learning after the fall of the Islamic Empire in Spain.

As a Western European brought up in the seventies and eighties, I was taught that the Renaissance as an effort of translating works directly from ancient Greece and the scientific method came out of Western European thought. In truth it was part of a more continuous process with the work of Arabic scholars spanning the gap back to ancient Greece with translations to Latin from Arabic. Al-Khalili uses the example of Copernicus who cites a number of Arabic scholars but his publications, and historical work over the last 100 years or so, show that the influences may well go deeper.

I enjoyed Pathfinders, I liked the focus on the science side of things, having had a more thorough coverage of the political side of things from Masood’s book. I also liked that some of Al-Khalili’s upbringing in Baghdad came through. It has prompted me to look up books on Indian science in the first millennia and pre-Renaissance science in Europe.

Oct 08 2025

Book review: Science and Islam – A History by Ehsan Masood

My next review is of Science and Islam: A History by Ehsan Masood. It follows on from a lot of reading I’ve done around the history of science in Western Europe and the US. It also fills a gap between books I’ve read on the Iron Age and Roman Period and the Early Modern Period. Much of the action takes place in the so called Dark Ages – a time where in my part of North West England Roman ruins were collecting pigeon droppings and little other archaeology survives!

Science and Islam is comprised of three parts, the first is an overview of the politics of the Islamic Empire from the 7th century until the Mongol invasion 13th century with an aside regarding the Tartar invasion in the 14th century. The second part covers sciences thematically. The final, shorter part, covers philosophy, the impact of Islamic science on Western European science in the 16th century and beyond and the post-colonial landscape.

Islam was founded by the Prophet Muhammad in 610CE, he died in 632CE. A series of four Caliphs built the Islamic Empire by taking over the Persian Empire and chunks of the Byzantine Empire in the following three decades. The Empire would reach Spain in 711CE.

The Umayyads were the first caliphate dynasty, they used Damascus as their capital, but were deposed by the Abbasids in 747CE who went on to found their capital in Baghdad. The Empire managed to retain a single leader, or Caliph until 909CE when the Fatamid Caliphate was established in Cairo. Subsequently a caliphate was established in Córdoba, Spain in 929CE. Each of these capitals became a seat of learning.

Science in the Islamic Empire started with a translation project commenced under the Abbasid regime in Baghdad which sought to translate scholarly works principally from Ancient Greece but also from Persia and India. It was conducted by Muslim, Christian and Jewish scholars with a focus on practical texts rather than literature – it struck me that this was echoed by the Renaissance in Western Europe some time later. The crudest translations were simply word for word transcriptions which often led to near gibberish. More thoughtful translators translated for meaning and often added their own commentary – a start to new science. The translation enterprise was boosted by the arrival of paper in Baghdad in 751CE from China.

The Islamic Empire lingered on as the Ottoman Empire until after the First World War although it had largely lost its interest in science. The golden age of the Islamic Empire ended with the Mongol invasions from the East in the 13th century. The Islamic Empire finally left Spain in 1492 although from the 13th century all that remained was the small Emirate of Granada.

The thematic chapters of Islam and Science cover medicine, astronomy, maths, chemistry and mechanical devices. The impact of Arabic scientists is visible in our language: in astronomy with star names like Aldebaran, Rigel, Betelgeuse; chemistry has alkali, alcohol, alchemy, and chemistry; maths has algebra and algorithm.

Medicine was important in the Islamic Empire, initially they followed the Greek physician Galen’s ideas which were derived from Hippocrates’ four humours model of medicine. By the 9th century some were questioning aspects of Galen’s work – his human anatomy was rather suspect since he relied on animal dissections. Later Ibn-Sina’s (latin: Avicenna) Canon of Medicine summarised all of medical knowledge from Galen but also Persian, Chinese and Indian medicine – it was in print for six centuries. Hospitals were established in the nineth century onwards and many remained open for centuries. Medical trials were seen as an accepted part of medicine.

Islamic practice makes three demands on astronomy – timing for five prayers a day, the direction to Mecca, and the 12 months of the year. Sophisticated measurement is not absolutely required for this but in practice each mosque had its own timekeeper  – a muwaqqit – so their was a lot of expertise in astronomy around, and a lot of observations were being made. More so after Ptolemy’s work on celestial motions was translated into Arabic which led Islamic astronomers to compile tables of celestial motion and compare them to Indian and Greek measurements. Ptolemy’s work is fatally flawed because it assumes a geocentric system with motion built from an ever increasing number of epicycles. The Islamic astronomers realised there were problems with this model and made some attempts to fix them but retained geocentricity. There is some evidence that Copernicus knew of this work when he proposed his heliocentric model.

As for maths, in the West we use “Arabic Numerals”, in Arabic these are referred to as “Indian Numerals” this is a result of the work of Al-Khwarizmi, who was born in 786CE. Essentially he popularised “Indian numerals” by translating Indian mathematical works. It is from him that we get “algebra”, interestingly his algebra was expressed in words not symbols, and was invented at the behest of his Caliph in an effort to simplify Islamic law around inheritance. I am bemused that mathematics, often seen as the “purist” of sciences, developed from accountancy and law. In the 11th century Omar Khayyam produced geometric solutions to cubic equations and also calculated the length of the year very precisely. Islamic scholars also developed trigonometry from the work of Greek and Indian scholars.

The chapter on chemistry talks mainly about Jabir ibn-Hayyan (latin: Geber) from the 8th century. A large number of texts are attributed to him covering many experimental methods, equipment, processes (such as distillation and reduction) as well as chemicals like sulphuric and nitric acid. In common with the Early Modern Period in Western Europe, alchemy and chemistry existed side by side.

The brothers Jafar-Muhammad, Ahmad and Al-hasan known as Banu Musa were adopted to the House of Wisdom in Baghdad under the reign of Caliph al-Mamun in the 9th century. They were involved in the translation project but went on to describe one hundred mechanical toys in their Book of Ingenious Devices – many were powered by pressurised water. The pinnacle of Islamic engineering was Badi al-Zaman al-Jazari whose 1206 book, sometimes called Automata, described how to build 50 complex automata.

The Islamic Empire had been in contact with Europe through the medieval period, one gets the impression of science in Western Europe being kickstarted by contact with the Islamic Empire as it went into decline in the 13th century. It is clear that European scholars were familiar with Arabic sources in the Early Modern Period but tended not to cite them – the strong citation culture we see in modern science is a 19th century invention.

A couple of times Masood talks about Islam being easy to follow as an adherent – although one can make sophisticated determinations of time for prayers, and the direction of Mecca it is not strictly required so the religion itself does not make great demands on science. I found this a bit puzzling since it seems to me that this is the case for most religions worshipped now. I wonder whether it is a comparison with Sumerian and Egyptian systems or whether it is to highlight that science is not a necessity to Islam.

I found this a great introduction to the medieval Islamic Empire and Islamic science in the 7th to 16th centuries. It is quite brief and readable. For me the context of the Islamic Empire was very useful since it was something of which I was completely ignorant. As a scientist I would have preferred a bit more depth to the science and scientists but with the inclusion of the background material I needed on the Islamic Empire it would have made a rather longer book.

Jan 08 2024

Book review: Her Space, Her Time by Shohini Ghose

My next review is of Her Space, Her Time by Shohini Ghose. I picked this book up as a result of a review in New Scientist. It is in the spirit of Broad Band which covered the contributions of women to computing over the years – contributions which have historically been ignored. Her Space, Her Time does the same for women in physics, generally on the astrophysics and cosmology side of the subject.

The book is divided into seven chapters each covering an area of physics and a group of women who worked in those areas. The chapters cover star cataloguing (and rather more), the big bang, the space programme, radioactivity, nuclear fission, particle physics and dark matter/ beta decay. This results in a coverage which is approximately chronological.

There are some recurring themes in the book: women not allowed entry to universities for undergraduate and graduate studies, women not allowed employment in university departments and facilities (often the pretext is the lack of toilets for women), women not allowed employment at the same institution as their spouse (this seemed common in the US and its effect on the recruitment and promotion of women was noted as far back as 1966), being ignored by the Nobel Prize committee and (sometimes) their male collaborators. These women were frequently the only women in the room. Fleeing Nazi Germany (and Austria) is a theme too but that applies equally to men.

On a more positive note their work was often recognised and rewarded during their lifetimes by their scientific communities. In at least the case of Ernest Rutherford and Ernest Lawrence they had the support of senior scientists throughout their lives.

The Harvard Observatory features heavily in the first couple of chapters. Women originally became involved as “computers” analysing the stars in the photographic plates. They included Williamina Fleming, Annie Jump Cannon, Antonia Maury and Cecilia Payne-Gaposchkin with Anna Draper providing funding to the observatory via a bequest in the late 19th century. In they first instance they were analysing stars for brightness and then later for spectral features. A group of women were responsible for compiling the “Harvard” stellar classification scheme which classifies stars by temperature using the letters O, B, A, F, G, K, M (typically remembered by a sexist mnemonic). One of the women, Henrietta Swan Leavitt, discovered the relationship between brightness and period for stars which is central to measuring intergalactic (and shorter distances) and was key to understanding the scale of the galaxy and the universe. Over a very long period Harvard Observatory allowed women to be employed as astronomers, and finally become professors in astronomy. The transitions usually being the result of a change in observatory or university management.

The third chapter is a bit of an oddity, looking at women’s contributions to the space programme on the project management and rocketry side of things rather than physics as such.

The final four chapters are then an extended collection on nuclear physics starting with Marie Skłodowska-Curie, and the less well known Harriet Brooks who worked on the new subject of radioactivity in the late 19th century. Brooks worked with Rutherford, publishing in 1904 in Nature on their discovery of radon. Rutherford and Frederick Soddy would earn the Nobel Prize for the transmutation of elements whilst Brooks was left out. Rutherford and Brooks clearly had a long personal relationship, ending in 1933 on her death at the age of 56. Brooks had left physics research in 1907 when she married Frank Pitcher.

Chapter 5 largely concerns Lise Meitner who was involved in the discovery of nuclear fission with Otto Hahn with whom she worked closely for many years. Hahn received the Nobel Prize for their work on nuclear fission, whilst she did not – this has been seen as one of the more egregious omissions of the Nobel Prize Committee – Meitner was nominated for a Nobel Prize 48 times and was widely recognised as an expert in her field. Her position was made more difficult because she was Jewish, worked in Austria and with Hahn who despite protestations was a Nazi sympathiser at the very least.

Chapter 6 concerns cosmic rays and the photographic detection thereof. It starts with Bibha Chowdhuri who is from Ghose’s home city of Kolkata and was later to discover cosmic ray muons using this method. The focus of the chapter though is Marietta Blau and her student Hertha Wambacher who developed the method of photographic detection of cosmic rays. The Meitner/Hahn story is reprised here with Jewish Blau forced to leave Vienna in 1938 with her student Wambacher, a Nazi sympathiser, remaining to take credit. Elisa Frota-Pessoa, a Brazilian physicist, is mentioned somewhat incidentally towards the end of the chapter with Ghose stumbling on one of her (very prescient) publications whilst researching other work.

The book finishes with the slightly odd pairing of Wu Chien Shiung who was instrumental in the discovery of parity violation which won her colleagues Tsung-Dao Lee and Chen-Ning Yang the 1957 Nobel Prize in Physics (they specifically mentioned her in their acceptance speech) and Vera Rubin who is credited with discovering dark matter by measuring the rotation curves of galaxies and observing that they flatten at large radii – an indicator of the presence of extra, unseen matter.

Reading back through my notes, women were at the heart of modern physics through the 20th century, often those women were the only ones in the room – it is clear they were exceedingly capable. The men around them collected a dozen Nobel Prizes whilst the only woman from this book to win the Nobel Prize for Physics was Marie Skłodowska-Curie. Maria Goeppert Mayer shared the Nobel Prize for Physics in 1963 she is the only other woman to win in the 20th century. She is not included in this book, perhaps because her Nobel Prize meant she was already well known.

In the past I thought the Nobel Prize committee were simply a bit careless in failing to award women but reading this book it seems they were rather purposeful – the physics community knew these women, and the significance of what they had done, and many were nominated for a Nobel Prize, often repeatedly.

As a result of this book I am now interested in a parallel volume of Indian scientists in the West!

Dec 08 2023

Book Review: Grace Hopper – Admiral of the Cyber Sea by Kathleen Broome Williams

After reading Broad Band by Claire L. Evans, about women in computing, I realised Grace Hopper was important, so I thought I’d hunt out a biography. I found Grace Hopper: Admiral of the Cyber Sea by Kathleen Broome Williams. Unusually I bought it second hand – my copy came from the Richard Stockton College of New Jersey Library Pomona, and has an austere, maroon cover.

Grace Hopper was born in New York City in 1906, she died in 1992. An undergraduate in mathematics she started a career in teaching at Vassar College but joined the Navy after the US joined the Second World War. She was posted to work on the Mark I computer at Harvard. She subsequently wrote the first software compiler, and was instrumental in the creation of the COBOL programming language. After “retiring” she then had a long career in the US Navy working on standardising their computing systems. After finally retiring from the Navy she worked for DEC for a few years until her death at the age of 86. She finished her career a rear admiral in the US Navy and has a battleship named for her (the USS Hopper) amongst numerous other rewards.

Grace Hopper gives some feel as to how it was to grow up in a relatively wealthy New York City family. The Hopper family had a holiday home in Wolfeboro, New Hampshire which, when she was small, was a day and a half travel to reach from New York City. She was brought up to be self-sufficient and trained in mathematics. Her father worked in insurance and was a double amputee – he wanted to make sure his children could fend for themselves should he die although he survived to a fair age.

Hopper studied mathematics first at Vasser College before going to Yale for a PhD in mathematics. She married Vincent Hopper in 1930, they bought a summer home of their own in Wolfeboro for $450 – part of a wedding gift. They were divorced in 1941 although it was not something she talked about, despite giving numerous interviews later in her live. Grace Hopper does not indicate the grounds for her divorce. After gaining her degree she became a lecturer in Vasser College where she was an excellent and committed teacher.

When America joined the war she was keen to serve in the US Navy which she achieved following some struggle. Fundamentally they were not keen to employ women, furthermore she was older than the Navy typically recruited, technically underweight and in a reserved occupation (as a lecturer in mathematics). Eventually she joined in 1942, and finally entered service in 1944, after training. She was proud to work in the Navy throughout her life and even whilst employed in industry she continued in the reserve service. In her Navy service she found a link with the dignitaries, including royalty, she met in later life.

Her naval placement was with the Mark I computer at Harvard, invented by Howard Aiken and built by IBM. It was the first programmable electromechanical computer in the world. Based on the slightly older relay technology rather than valves found in successors it was used principally for ballistic calculations as well as calculations of various function tables. Aiken was pretty tough to work with but Hopper clearly knew how to handle him and held him in high regard. She worked on many of the Mark I’s smaller programming jobs as well as doing more than her share of documentation and report writing.

One issue with the Mark I was that it was programmed with paper tape, the programs and data are stored as a pattern of holes 3-4mm across punched out the tape. There was a lot of paper around, as well as the disks of paper punched out from the tape. Sometimes one of the punched out disks was re-united with a hole causing an error, as Hopper pointed out “a hole getting back into a hole”!

After the war it was clear she would not be able to continue at Harvard, so she let to work on the UNIVAC at the Eckert–Mauchly Computer Corporation, later bought by the Rand Corporation and then IBM. Through Hopper’s life we see the birth and maturing of the new computing industry.

Hopper realised there was a need for standardisation in programming languages. There were an increasing number of different types of computer around, and the maintenance and programming of such computers was a bigger job than had initially been realised. Standardisation reduces this problem because a program written for one computer can be run on another. This is how COBOL was born, the Navy sponsored the Committee on Data Systems Languages (CODASYL) which created the COBOL programming language which was derived from Hopper’s FLOW-MATIC language developed for the UNIVAC.

As a scientist and software developer for 30 years I was scarcely aware of COBOL, yet it comprised approximately 80% of running code in the late nineties, according to Gartner. I imagine that figure has not dropped greatly. There is clearly a huge body of COBOL “dark matter” that software developers don’t talk about. The reason for COBOL’s obscurity seems to be the disdain of the academic computer science community, FORTRAN – born at the same time – suffers a similar disdain.

During her time working on UNIVAC Hopper maintained her Navy connection through a reserve position, and in 1966 – at the age of 60 – she retired from the reserve to work full time for the Navy at the Pentagon. She continued to work in the Navy until 1986 when she left to join DEC, at the age of 80!

In this book Grace Hopper comes out as an exceptional character. Her great skills were rooted in teaching, the drive to build a compiler was partly making her own life easier but also democratising the process of programming. She also saw the importance of raising a generation of programmers. She was very personable but seemed to have virtually no personal life. She drank moderately and smoked heavily for most of her life, and clearly had a bit of a hording problem towards the end. She was a life-long Republican and saw little value in the women’s rights movement – her own enormous success giving her the impression that there was no inequality to address.

Throughout her life, well into the period others might consider retiring, she was was engaged in a full schedule of public speaking. She gained many rewards, and a great deal of recognition in her lifetime.

I really enjoyed this book, the only place my interest lessened slightly was in the chapter describing administrative reorganisations of the US Navy. I am in awe of the achievements of Grace Hopper.

Sep 26 2023

Book review: The First Astronomers by Duane Hamacher

My next review is of First Astronomers: How Indigenous Elders read the stars by Duane Hamacher. It is fair to say that Western astronomers, and other Western scientists have not treated Indigenous populations, and their knowledge, with a great deal of respect. Even now astronomers are in dispute with Indigenous populations in Hawaii over the siting of telescopes. In this book Hamacher tries to redress this imbalance and in my view does a good job of treating his interviewees, and their knowledge, with respect.

Western astronomers are not alien to interacting with people outside their professional group as part of their research most notably using historical data, like Chinese records of supernova but also amateur observers play an important in modern astronomy – particularly in the observation of comets and the like and other transient phenomena accessible using modest equipment.

The book starts with a prologue describing the background to the book and introducing a number of the Indigenous people who contributed, in the longer frontspiece they are listed as co-authors. They are largely from Australia but there are references to New Zealand, North American Native Americans, Artic peoples, South American and Africa groups.

Hamacher is an astronomer by profession and this has a bearing on this interviews with Indigenous Elders. In the past anthropologists have talked to Elders about their star knowledge and a lack of astronomical knowledge has led to mis-interpretation. I was intrigued to learn that in Western mythology the star name “Antares” is derived from the greek “anti Mars” – since Mars and Antares, in the same part of the sky and with a reddish hue are often confused!

The book is then divided thematically into chapters relating to different sorts of stars (including the moon). These are The Nearest Star (the sun), The Moon, Wandering Stars (planets), Twinkling Stars, Seasonal Stars, Variable Stars, Cataclysmic Stars (supernova and the like), Navigational Stars and Falling Stars (meteors and craters).

The big difference a Western reader will see is that Indigenous knowledge is transmitted via oral traditions, incorporating song and dance. Oral traditions are about creating a story around some star locations that provide useful information like where and when to hunt a particular animal or plant a particular crop, or where you are and how to get to where you want to be . The story linked to the stars allows it to be transmitted to the next generation without error. They are mnemonics rather than an attempt to describe a factual truth. This is obvious in Indigenous oral traditions which are still alive but I suspect it would have been the case for the oral traditions of Western Europe which give us our modern constellations.

Oral traditions can be very powerful, there is a group of craters in Australia (the Henbury Craters) which were created by a meteor impact around 4200 years ago – Aboriginal oral traditions have held this knowledge of their creation across that period of time.

Indigenous constellations can overlap and change through the seasons, they also incorporate dark space – particularly in the Milky Way. These constellations are locally determined to fit with local conditions, and land features used as landmarks.

As well as maritime navigation where the stars are used directly for finding direction, the stars are also used as a navigational aid for terrestrial travel – the routes are learnt in the dark of the winter using the stars as a map of the ground (picking stars which approximate the locations on the ground). These “songlines” are reflected in some modern day highways in Australia.

What comes through from the book is that Indigenous astronomers were very astute observers of the sky, noting phenomena including the varying twinkle of stars (including colour and intensity variations), the 8 year period of Venus returning to the same location in the sky, variable stars, sunspots and their 11 year cycle, the sounds associated with aurora and so forth. Some of these phenomena were not widely recognised by astronomers in the West until into the 19th century. In addition they had a clear understanding of many phenomena: that the moon reflected the light of the sun, that the earth was a sphere, that craters were the result of rocks falling from the sky.

Unsurprisingly, I was constantly comparing with Western astronomy. The great divergence was sometime around the end of the 16th century when Western astronomers started making detailed written records of the locations of stars and planets and using mathematics to understand them, and then moved on to the use of telescopes. I can’t help feeling the Indigenous people were held back by a lack of writing.

What comes through at the end of the book is that in the Indigenous communities have a long history of passionate and astute astronomers, dedicated to their role, and increasingly they are taking part and excelling in Western astronomy and astrophysics.