Archive for the History Category

An Cháisc versus Y Pasg

Posted in History, Irish Language with tags , , , , on April 5, 2026 by telescoper

Today is Easter Sunday and it says something about my poor grasp of the Irish language that it was only today that I learnt that the word for “Easter” in modern Irish is Cáisc. When following the definite article (as in the title of this blog), this becomes Cháisc. You can also find the possessive form Cásca, e.g. Easter Sunday is Domhnach Cásca.

Although it’s not immediately obvious, the word Cáisc is related linguistically to the Latin “Pascha” and Hebrew “Pesach,” and to the word for Easter in many other European languages  PâquesPascua, etc.), including the Welsh Pasg (the form Y Pasg with the definite article appears in the title of this post) as well as to the English adjective “paschal”. 

I haven’t succeeded in becoming at all fluent in Irish, but I have learnt that isn’t very much like Welsh.  Although Irish and Welsh are both Celtic languages they are from two distinct groups: the Goidelic group that comprises Irish, Manx and Scottish Gaelic; and the Brythonic group that comprises Welsh, Cornish and Breton. These are sometimes referred to as q-Celtic and p-Celtic, respectivelyalthough not everyone agrees that is a useful categorization. Nevertheless it has stuck and does help with some aspects. The C at the start of Cáisc is a manifestation of the roots of modern Irish in a q-Celtic, as opposed to p-Celtic, language. Hence the difference between it and the Welsh Pasg. Irish, as a q-Celtic language, will generally tend to have a k/c/q sound at the start of words that start with a p-sound in Welsh (or others derived from Latin); the “q” is, of course, historic, since very few modern Irish words begin with “q”. Another example is the word for the number “four”: in Irish it is ceathair; in Welsh it is pedwar

Incidentally, Scottish Gaelic is not the language spoken by the Celtic people who lived in Scotland at the time of the Romans, the Picts, which is lost. Scottish Gaelic is actually descended from Middle Irish. Also incidentally, Breton was taken to Brittany by a mass migration of people from South-West Britain fleeing the Anglo-Saxons which peaked somewhere around 500 AD. I guess that was the first Brexodus.

Although I speak neither with any proficiency, Welsh and Irish don’t sound at all similar to me. This is not surprising. It is thought that the Brythonic languages evolved from a language  brought to Britain by people from somewhere in Gaul (probably Northern France), whereas the people whose language led to the Goidelic tongues were probably from somewhere in the Iberia (modern-day Spain or Portugal). The modern versions of Irish and Welsh do contain words borrowed from Latin, French and English so there are similarities there, but the original Celtic languages were very different.

Beannachtaí na Cásca!

Tá coinín na Cásca tagtha

Finding Easter

Posted in History, The Universe and Stuff with tags , , , , , , on April 3, 2026 by telescoper

As an Astronomist I am often asked “How do they calculate the date of Easter?”, so here goes.

The simple answer is that Easter Sunday is on the first Sunday after the first full Moon on or after the Vernal equinox. The Vernal Equinox took place this year on March 20th and the first full moon after that was on April 2nd.

I say “simple” answer above because it isn’t quite how the date of Easter is reckoned for purposes of the liturgical calendar.

For a start, the ecclesiastical calculation of the date for Easter – the computus – assumes that the Vernal Equinox is always on March 21st, while in reality these days it is more frequently 20th March, like this year.

On top of that there’s the issue of what reference time and date to use. The equinox is a precisely timed astronomical event but it occurs at different times and possibly on different days in different time zones. Likewise the full Moon. In the ecclesiastical calculation the “full moon” does not currently correspond directly to any astronomical event, but is instead the 14th day of a lunar month, as determined from tables (see below). It may differ from the date of the actual full moon by up to two days.

There have been years (1974, for example) where the official date of Easter does not coincide with the date determined by the simple rule given above. The actual rule is a complicated business involving Golden Numbers and Metonic cycles and whatnot.

Here is an excerpt from the Book of Common Prayer that shows Anglicans how to determine the date of Easter for any year up to 2199:

The calculations are based on the approximately 19-year metonic cycle, which is why the above table will not work indefinitely

For this year we find that (2026+1=2027) ÷19=106 with a remainder of 13 (106 × 19 being 2014). The Golden Number for this year is therefore 13, or XIII in the Table. This gives the date of the Paschal Full Moon, which occured this year on 2nd April, which is indeed the day in the centre column next to XIII in the left-hand column in the table. The Sunday Letter is determined by the remainder of (2026+506+6)÷7, which is 4, so this year’s Sunday Letter is D. The date of Easter Sunday is given by the entry in the centre column next to the first occurrence of D in the right-hand column after the Golden Number XIII appears in the left-hand column, i.e. April 5th. I hope this clarifies the situation.

Time for Summer?

Posted in History, Maynooth with tags , , , on March 29, 2026 by telescoper

Last night the clocks went forward an hour so we are now on Irish Summer Time (GMT+1, the same as BST). Among other things, this means that for the next seven months or so the clock on my oven will actually be set correctly…

One of the more sensible decisions made by the European Parliament some years ago was to approve a directive that will abolish `Daylight Saving Time’. I’ve long felt that the annual ritual of putting the clocks forward in the Spring and back again in the Autumn was a waste of time effort, so I’ll be glad when this silly practice is terminated. It would be better in my view to stick with a single Mean Time throughout the year. This was supposed to happen in 2021 but was delayed by the pandemic and still hasn’t happened.

The marvellous poster above is from 1916, when British Summer Time was introduced, though it ran for only about 4 months (May to September), rather than the seven we have now (March to October).

You might be surprised to learn that the practice of changing clocks backwards and forwards is only about a hundred years old. in the United Kingdom. To be honest I’m also surprised that the practice persists to this day, as I can’t see any real advantage in it. Any institution or organization that really wants to change its working hours in summer can easily do so, but the world of work is far more flexible nowadays than it was a hundred years ago and I think few would feel the need.

Anyway, while I am on about Mean Time, here is a another poster from 1916.

Until October 1916, clocks in Ireland were set to Dublin Mean Time, as defined at Dunsink Observatory, rather than Mean Time as defined at Greenwich. The adoption of GMT in Ireland was driven largely by the fact that the British authorities found that the time difference between Dublin and London had confused telegraphic communications during the Easter Rising earlier in 1916. Its imposition was therefore, at least in part, intended to bring Ireland under closer control of Britain. Needless to say, this did not go down well with Irish nationalists.

Ireland had not moved to Summer Time with Britain in May 1916 and was still on Dublin Mean Time, which was 25 minutes 21 seconds behind GMT, so the change to GMT was introduced at the same time as BST ended in the UK, hence the alteration by one hour minus 25 minutes 21 seconds, i.e. 34 minutes and 39 seconds as in the poster.

The End of Doggerland

Posted in History, The Universe and Stuff with tags , , , on March 26, 2026 by telescoper

Some time ago I posted an item about Doggerland which is not (as you might have imagined) a theme park devoted to outdoor sexual activities, but an area now submerged beneath the North Sea that connected Great Britain to continental Europe during and after the last glacial period.

About 12,000 years ago at the start of the Holocene Era, it is thought that the area now covered by the North Sea looked something like this:

(Picture credit: this website). Obviously the cities marked on the map were not there at the time! Britain was connected to the European mainland, although much of the land mass was under glaciers. At the end of the last ice age the glaciers retreated, sea levels rose and the area once covered by Doggerland was submerged. It is thought that this happened around 8500 years ago. Great Britain has been separated from the continent by less than 10,000 years.

Doggerland gets its name from the Dogger Bank, a huge sandbank off the North-Eastern coast of England which is thought to be a glacial moraine left behind by the retreating ice sheet. The Dogger bank lies about 60 miles from the coast, and is about 60 miles wide by 100 miles long. The water is quite shallow – typically 20 metres deep – and is a well-known fishing area. Its name derives from old Dutch fishing vessels called doggers who specialised in catching cod. Modern fishing boats trawlers operating at the Dogger Bank frequently bring up bits of ancient animals (including mammoth and rhinoceros) as well as prehistoric human artefacts, showing that the area was at one time inhabited.

As I wrote in my old post

I don’t think anybody knows exactly how long it took Doggerland to become submerged, but it may well have involved one or more catastrophic flooding events.

Well, by way of a sort of update here is a short video that suggests that the archaeological and geological clues indicate that the end of Doggerland was associated with one particularly huge event.

On the “History of Science”

Posted in History with tags , on March 25, 2026 by telescoper

I came across this interesting and provocative post yesterday and thought I’d share it here for the edification of my several readers.

Lá Fhéile Pádraig sona daoibh go léir!

Posted in History, Literature, Maynooth with tags , , , , , on March 17, 2026 by telescoper

Well, it’s St Patrick’s Day, which means I’m on holiday. I’ll soon be toddling off to watch the parade in Maynooth, which passes quite close to my house. In accord with tradition, it’s very cold today – and not a little windy – but at least it’s not raining.

Not many facts are known about the life of St Patrick, but it seems he was born in Britain, probably in the late 4th Century AD, probably somewhere around the Severn Estuary and possibly in Wales. It also appears that he didn’t know any Latin. When a young man, it seems he was captured by Celtic marauders coming up the River Severn and taken as a slave to Ireland. He eventually escaped back to Britain, but returned to Ireland as a missionary and succeeded somehow in converting the Irish people to Christianity.

Or did he? This interesting piece suggests his role was of lesser importance than many think. On the other hand, if even a fraction of what is said about him is true, then he must have been a very remarkable man.

However it happened, Ireland was the first country to be converted to Christianity that had never been part of the Roman Empire. That made a big difference to the form of the early Irish Church. The local Celtic culture was very loose and decentralized. There were no cities, large buildings, roads or other infrastructure. Life revolved around small settlements and farms. When wars were fought they were generally over livestock or grazing land. The church that grew in this environment was quite different from that of continental Europe. It was not centralized, revolved around small churches and monasteries, and lacked the hierarchical structure of the Roman Church. Despite these differences, Ireland was well connected with the rest of the Christian world.

Irish monks – and the wonderful illuminated manuscripts they created – spread across the continent, starting with Scotland and Britain. Thanks to the attentions of the Vikings few of these works survive but the wonderful Lindisfarne Gospels, dating from somewhere in the 8th Century were almost certainly created by Irish monks. The Book of Kells was probably created in Scotland by Irish Monks.

The traffic wasn’t entirely one-way however. A while ago I saw a fascinating documentary about the Fadden More Psalter. This is a leather-bound book of Psalms found in a peat bog in 2006, which is of similar age to the Lindisfarne Gospels. It took years of painstaking restoration work to recover at least part of the text (much of which was badly degraded), but the leather binding turned out to hold a particularly fascinating secret: it was lined with papyrus. The only other books from the same period with the same structure that are known are from the Coptic Church in Egypt. That doesn’t mean that whoever owned the Fadden More Psalter had actually been to Egypt, of course. It is much more this book made its way to Ireland via a sort of relay race. On the other hand, it does demonstrate that international connections were probably more extensive than you might have thought.

Anyway, back to St Patrick’s Day.

Saint Patrick’s Day is celebrated on March 17th, the reputed date of his death in 461 AD. Nobody really knows where St Patrick was born,, and the when of his birth isn’t known either.

In any case, it wasn’t until the 17th Century that Saint Patrick’s feast day was placed on the universal liturgical calendar in the Catholic Church. Indeed, St Patrick has never been formally canonized. In the thousand years that passed any memory of the actual date of his birth was probably lost, so the choice of date was probably influenced by other factors, specifically the proximity of the Spring Equinox (which is this year on Saturday March 20th).

The early Christian church in Ireland incorporated many pre-Christian traditions that survived until roughly the 12th century, including the ancient festival of Ēostre (or Ostara), the goddess of spring associated with the spring equinox after whom Easter is named. During this festival, eggs were used a symbol of rebirth and the beginning of new life and a hare or rabbit was the symbol of the goddess and fertility. In turn the Celtic people of Ireland probably adapted their own beliefs to absorb much older influences dating back to the stone age. St Patrick’s Day and Easter therefore probably both have their roots in prehistoric traditions around the Spring Equinox, although the direct connection has long been lost.

Lá Fhéile Pádraig sona daoibh go léir!

Tony Benn in 1998

Posted in History, Politics with tags , , on March 8, 2026 by telescoper

This powerful contribution by Tony Benn to a debate in the House of Commons ahead of the bombing of Iraq in 1998 is, sadly, just as relevant to the bombing of Iran in 2026.

On Pedantry, by Arnoud S.Q. Visser

Posted in Beards, History, Literature, Pedantry with tags , , , , , , , on March 5, 2026 by telescoper

Regular readers of this blog will be surprised to learn that I have, from time to time, been accused of being somewhat pedantic, though not as often as I am accused of being a tad sarastic. Anyway, a certain person recently bought me a copy of On Pedantry (subtitled A Cultural History of the Know-it-all) by Arnoud S.Q. Visser, who is Professor of Textual Culture in the Renaissance at Utrecht University in the Netherlands. Whatever the reason for the gift, I found it a very enjoyable read and learnt a huge amount from it.

Working in a University it is hard to escape the stereotype of the Boffin or the Know-all. I suppose it is because it is part of the scholarly life that we tend to criticize the work of other academics – mostly with the intention of advancing knowledge – that we run the risk of being thought to be excessively assiduous in correction things we perceive to be incorrect or unclear – in other words, of being pedants – and irritating all kinds of people in the process. This book studies the long history of this sort of behaviour , in as part of the broader history of anti-intellectualism, a story of suspicion and deprecation of expertise that is highly relevant today. We have recently seen a widespread assault on universities, the removal of swathes of information (such as environmental data) from the websites of federal agencies, and the discrediting of the use of vaccines and of scientists engaged in vaccine research. The reader of On Pedantry will discover that this sort of hostility is by no means new.

The word “pedant” as such first appears as such in Renaissance Italy, with pedante being a name for private tutors who were hired by the wealthy to teach their children. Such teachers were of a lower social status than their students, so the word gained a negative connotation, especially when combined with the ostentatious display of knowledge with which these teachers were often associated – the new pedants soon found themselves satirised in sonnets and plays.

But although the word dates from much later, Visser identifies the original pedants in ancient Greece, among the Sophists, who emerged as a group of experts in the Athens of the fifth century BCE, with figures such as Protagoras and Prodicus becoming celebrities thanks to their novel approach to learning: they emphasised argumentation and speech, practices that became closely linked to the emergence of democracy. The Sophists gained a reputation, however, for competitive debate that was more about winning an argument than discovering the truth. The name “Sophist” comes from sophia, the greek word for knowledge, from which we get “Philosophy” but also “sophistry” (the use of clever but false arguments).

The philosopher Plato deplored the pedantic nature of Sophists in several of his dialogues and in his Republic, where they would rather “have a quarrel than a conversation”. The playwright Aristophanes went further, lampooning them in his play The Clouds, perhaps the first satire on intellectuals. In ancient Rome, this mistrust of the intellectual took on another aspect – a disdain the lack of practical use of much of Greek philosophy.

Incidentally, I learnt reading this book that the Emperor Hadrian, keen to demonstrate his own intellectual capacity and his admiration for Greek philosophy, forged the link between learning and social elite status by growing a beard, unusually for high status Romans of his time. Hadrian’s beard became much imitated – as a marker of intellectual capacity – but also lampooned as a sign of pretentiousness.

The next developments mapped out by Visser concern the rise of the scholar – in the middle ages and the Renaissance – whose world centred specifically on the Latin language, its literature and grammar. The learning of teachers and scholars was both celebrated and denigrated. John of Salisbury in the 12th century loathed “academics … poring over every syllable … expressing doubts about everything”. The French philosopher Michel de Montaigne wrote a famous essay On Pedantry, which is well worth reading; this is one of the few references in this book that I’ve actually read! Negative depictions of the intellectual subsequently appeared widely in literature, from Molière to Shakespeare. During the Enlightenment, pedantry was dismissed as a “vice of the mind”, with writers such asDiderot, in the prospectus to his famous Encyclopédie, writing that “he who claims to know everything only shows himself ignorant of the limits of his human mind”.

Closer to modern times, Visser switches his attention to America and the mistrust of scholars there, beginning with Thomas Paine, whose bestselling Common Sense provided a major influence on the American revolution. Paine identified refined language and classical erudition with a colonialist aristocratic mentality. Visser comments that “in a political culture of democratic machismo, politicians denounced colleagues who made an inordinate display of their education as elitist, overly sensitive, and effeminate”, I which is just as true of the 21st Century as the 19th. This American distrust of the expert even created a political party, the “Know Nothings”, in the early 19th century.

The final chapter of the book discusses attitudes towards intellectuals in popular culture, focussing on stereotypical portrayals of professors in Hollywood movies. I think more could have been made about the gendered nature of the pedant – until recently a stricly male stereotype. More recent versions are hardly more enlightened: just as male intellectuals are usually depicted as being “unmanly”, the focus on female academics in the movies is largely on their “mannish” looks.

I also think much more could be made of more recent phenomena, such as the annoying nitpicking of the anonymous internet troll and the rise of “mansplaining”. There’s also the emergence of generative AI. ChatGPT and other chatbots could have emerged as very irritating pedants, but instead they come across as servile and sycophantic, which some of us find even more irritating. And most most modern-day real-life pedants do not hallucinate or generate obvious untruths. Some of us who have been accused of being pedantic are at least trying to get things right, rather than pass off slop as truth.

As you might expect, this book involves many enjoyable digressions and asides. I especially appreciated the discussions of scholarly life and attitudes to education in mediaeval and early modern Europe. What you might not have expected for what is a scholarly work – with footnotes and whatnot – is that it is written in a very light and readable style and is frequently very funny.

Highly recommended.

Barddoniaeth ar gyfer Dydd Gŵyl Dewi

Posted in History, Poetry with tags , , , , , , , on March 1, 2026 by telescoper

Well, today is St David’s Day so let me first offer a hearty “Dydd Gwŷl Dewi Sant hapus i chi gyd” (Happy St David’s Day to you all). Here is a picture of some daffodils amid the undergrowth in my garden:

Over the years, I seem to have established a tradition of posting a bit of poetry to mark this special day for Wales and the Welsh and given current events I chose this one which I have posted before, about 9 years ago. It was written in Welsh by Hedd Wyn (born Ellis Humphrey Evans) who lived from 1887 to 1917; Hedd Wyn was his bardic name and it translates (roughly) as “pure peace”.

Hedd Wyn was a non-conformist Christian and a pacifist who was conscripted into the British Army to serve in World War 1. He was posted to Flanders and was killed in action on 31st July 1917, the first day of the 3rd Battle of Ypres. He was hit in the stomach by a shell and died later of his wounds. The battle stumbled on for months of horrific slaughter as the planned Allied offensive foundered in the mud of Passchendaele and ended, as had the Battle of the Somme a year earlier, in a bloody stalemate.

A few weeks before his death, Hedd Wyn wrote a poem called Yr Arwr (‘The Hero’) which was submitted for the prestigious Bard’s Chair at that year’s National Eisteddfod. It was announced on 6th September 1917 that  he  had won the prize, posthumously. The bard not being able to sit in the the chair, it was draped in black cloth. The Prime Minister, David Lloyd George, was present at the ceremony.

The poem Yr Arwr is a very long work, running to 13 pages of manuscript, which is not practicable to post here, but here’s another poem by Hedd Wyn. This is called Rhyfel (‘War’). I only have a few words of Welsh, but because of the occasion,  it seems appropriate to post this in its original language. You can find English translations here and on the Wikipedia page here. Translating poetry is always very difficult, but the sense of the poem is of a world in chaos that has been abandoned by God.

Gwae fi fy myw mewn oes mor ddreng
 A Duw ar drai ar orwel pell;
 O'i ôl mae dyn, yn deyrn a gwreng,
 Yn codi ei awdurdod hell.

Pan deimlodd fyned ymaith Dduw
 Cyfododd gledd i ladd ei frawd;
 Mae swn yr ymladd ar ein clyw,
 A'i gysgod ar fythynnod tlawd.

Mae'r hen delynau genid gynt
 Ynghrog ar gangau'r helyg draw,
 A gwaedd y bechgyn lond y gwynt,
 A'u gwaed yn gymysg efo'r glaw.

Imbolg, St Brigid, and the Quickening of the Year

Posted in Biographical, History, Maynooth with tags , , , , on February 1, 2026 by telescoper

It is 1st February 2026, which means that today is Imbolc (or Imbolg in modern Irish), an ancient Gaelic festival marking the point halfway between the winter solstice and vernal equinox.  In the old pagan calendar, this day is regarded as the first day of spring, as it is roughly the time when the first spring lambs are born, daffodils etc start to appear, and the days get noticeably longer.  The name Imbolg may be derived from “i mbolg” meaning “in the belly”, referring to the pregnancy of ewes. This time corresponds to the Welsh Gŵyl Fair y Canhwyllau and is also sometimes called, rather beautifully, The Quickening of the Year.  It’s a time for rebirth and renewal after the darkness of winter.

Incidentally, in spoken Irish it is common to place an unstressed vowel sound – often schwa – between certain pairs of consonants, e.g. the name “Colm” is pronounced “Collum”. This extends to Hiberno-English: e.g. many Irish people say “fillum” for “film”. Imbolg is therefore pronounced something like “Imbollig”. In phonology this is called  anaptyxis.

In Ireland Imbolc is usually often referred to a Lá Fhéile Bríde,  St Brigid’s Day, after St Brigid of Kildare, whose feast day is today 1st February. There are events going on in Maynooth, which is in Couny Kildare, but I am not in Maynooth today so I don’t know what is going on. Incidentally, the Celts counted each day starting from sunset, so the Imbolc/St Brigid’s Day celebrations in County Kildare started last night, 31st January, but I didn’t see any of them either.

In the Northern hemisphere, in astronomical terms, the solar year is defined by the two solstices (summer, around June 21st, and winter, around December 21st) and the equinoxes (spring, around March 21st, and Autumn, around September 21st). These four events divide the year into four roughly equal parts of about 13 weeks each.

If you divide each of these intervals in two you divide the year into eight pieces of six and a bit weeks each. The dates midway between the astronomical events mentioned above are the cross-quarter days, of which Imbolc is one. They are:

  • 1st February: Imbolc (Candlemas)
  • 1st May: Beltane (Mayday)
  • 1st August: Lughnasadh (Lammas)
  • 1st November: Samhain (All Saints Day)

The names I’ve added in italics are taken from the Celtic/neo-Pagan and, in parenthesis the Christian terms, for the cross-quarter daysThese timings are rough because the dates of the equinoxes and solstices vary from year to year. Imbolc is often taken to be the 2nd of February (Groundhog Day) and Samhain is sometimes taken to be October 31st, Halloween but hopefully you get the point that although the Pagan festivals have been appropriated by the Christian church, they have much older origins. The status of St Brigid herself is particular obscure; it is not known for sure whether she was a real person or Christian appropriation of a Celtic deity, or some amalgamation of those.

Until recently there was an anomaly in that the first of these was the only one not associated with a Bank Holiday. That was changed in 2022 and tomorrow, Monday 2nd February, will be the St Brigid’s Day holiday. It would have been the first of teaching in Semester 2 had it not been a holiday; we return to teaching on Tuesday. As you may have surmised, I’ve taken the opportunity of the long weekend for a bit of a break and a trip elsewhere.

P.S. As it also happens, today is also the 8th anniversary of the very first lecture I gave in Maynooth, on Computational Physics, on 1st February 2018. I”ll be giving pretty much the same lecture again on Thursday 5th February.