Explainer
Christmas culture
Creed
4 min read

Why Christmas Day is Christmas Day 

The seasons, festivals, historians and emperors have all influenced the date of Christmas.

Ryan Gilfeather explores social issues through the lens of philosophy, theology, and history. He is a Research Associate at the Joseph Centre for Dignified Work.

a had holds out a small wrapped Christmas present.

I came of age in the 2000s, a decade quite alien to us now. We saw ourselves as pioneers of technology, as the internet emerged in its prehistoric form. There was great optimism about the economy until it all went wrong in 2008. The New Atheism movement was roaring into public view, only to wane just as quickly the decade after. Growing up as a Christian, I remember spirited debates with my peers about whether science disproved Christianity and if God can be disproven. These questions have fallen out of view, just as many of its main proponents have too. Richard Dawkins rarely darkens the door of our TV screens anymore.  

However, one such moment of conflict sticks out in my mind. A friend announced to me that he had disproved the origins of Christianity. The night before he had discovered that in the third century Roman Empire, before Christianity became legal and the official religion, there was already a festival celebrating a god on the 25th of December. Instead of the birth of the Son of God, the Romans celebrated the rebirth of the Unconquered Sun — Sol Invictus. Then, in 336 under the first Christian Emperor, Constantine, that date was first celebrated as the day of the birth of Christ. My friend considered the case to be closed; surely the birth of Christ was merely a repurposing of an existing festival?  

Thankfully this shocking revelation did not pick away at the foundations of my faith. I continued, and still continue, to believe in and love the Christian God, as revealed in the Bible. Indeed, since that moment I have trained as a scholar in the history of the early Church, and have begun to see this question for what it is, a quirk of history.  

We, therefore, celebrate Christ’s birth on the 25th December on account of a quirk of history, a result of the way that Romans mapped significant events on to the waxing and waning of the light. 

The first claim that Christ was born on the 25th December appears in the third century. Sextus Julius Africanus, a Roman Christian historian, wrote an entire chronology of the world from creation to AD 221. He considered March 25th to be the date of creation, because it was the spring equinox in the Roman Calendar, a day which represents new life and new birth. For this reason, he likewise considered it to be the date of Christ’s conception in the womb. Crucially, nine months after that falls December 25th. Although I admire his logic, it is hardly a sound basis for establishing the date of our Lord’s birth. Indeed, other Christians didn’t accept this claim at the time either. 

As already mentioned, December 25th was a significant date in the Roman calendar already. It was the winter solstice, the shortest day of the year, after which the days begin to lengthen. It also shortly followed the popular Roman festival of the Saturnalia. Already endowed with significance, it is unsurprising that the Romans began to celebrate the rebirth of Sol Invictus, and the birth of another god, Mithras, on that date.  

At this time Christianity was an illegal religion, persecuted in some parts of the Roman Empire. However, in 312, the emperor Constantine converts to Christianity and in 313 makes it a legally tolerated religion. At this point he begins to invest the church and Christians with powers, wealth and privileges. Evidence from the Chronography of AD 354 suggests that Christmas was first celebrated on the 25th December in 336, during the reign of Constantine. Perhaps this was an attempt to dislodge existing pagan holidays, and replace it with a Christian one. Or, maybe the significance of the Winter solstice made that date most plausible. Indeed, it is easy to see how the commemoration of Christ coming into the world is particularly salient as the darkness begins to recede. The true answer is, of course, lost to history.  

We, therefore, celebrate Christ’s birth on the 25th December on account of a quirk of history, a result of the way that Romans mapped significant events on to the waxing and waning of the light. The true lesson here though, is that it simply doesn’t matter what the actual date of Christ’s birth was. Our records, and those available in the early church were simply not good enough for us to ever know. What matters is that God loves us so much, that he became human to bring us back to his side in everlasting joy and peace. We have no idea on what date Christ was born. But, each year the 25th December presents a time for us to remember that God became man, so that we might have everlasting life.  

Interview
Belief
Creed
Leading
S&U interviews
9 min read

The quantum of leadership: how to flourish in science

Resolving the big questions - a conversation with Andrew Briggs, quantum technology pioneer.
A professor stands next to experimental equipment.
Andrew Briggs beside quantum research equipment.

Professor Andrew Briggs has been at the forefront of quantum technology for decades, pioneering the use of AI and machine learning in quantum computing. Two technologies that will shape our world. 

Andrew has been a leader in a demanding and cutting-edge academic field. In this interview the Oxford-based academic shares his insights on how to lead scientific endeavours and flourish in life. 

Pawel Puczkarski: We meet on Northmoor Road, which, more than any other street, embodies the spirit of Oxford. 

Michał Łuczewski: I sense here the presence of all souls. 

Andew Briggs: Indeed! The Tolkien family first lived at number 22 before moving next door to number 20. Just opposite, in the garden shed of number 27, is where Sir Martin Wood built the first magnets for what was to become Oxford Instruments. Another neighbour was Sir Roger Bannister, the first man to run a mile in under four minutes. 

MŁ: High culture, big business, top sports. What about science? 

AB: Just across the street, Sir Rudolf Peierls spent his final years. He transformed our understanding of nearly every application of quantum theory, including materials science and nuclear energy. Nearby, Erwin Schrödinger was living at number 12 when he received the news that he had won the Nobel Prize; he later moved to number 24. It was also here that he conceived his famous Schrödinger’s cat thought experiment, which illustrated the fundamental insight of quantum physics—that quantum objects can exist in two states at once. The inspiration for the fictitious cat—both dead and alive—was quite alive. Schrödinger’s own cat was allegedly called Milton 

MŁ: What is your main driver in your manifold leadership roles? 

AB: The desire to contribute. And pure curiosity. I am absolutely fascinated by big questions. 

PP: What’s the biggest question that remains for you unanswered? 

AB:  I suppose it might be, “How can I be more loving?”  

MŁ: That’s a big question, how about big answers? 

AB: One thing I’ve learned over time is the ability to live with unresolved big questions while maintaining the curiosity to understand them better. Take quantum physics. Among scientists, there’s still no agreement on what exactly happens during the act of measuring a quantum system. And measurement is the most basic thing we do in experimental science. So, are we being intellectually irresponsible? Now take prayer. I don’t think there’s consensus among people who pray about what exactly happens when they do. I certainly don’t yet have a fully satisfactory answer. But I long for better understanding. Quantum technologies have too much potential to walk away from the mystery. Likewise, prayer is too important to abandon simply because I don’t fully comprehend it. 

MŁ: What is your own understanding of prayer, then? 

AB: Prayer is about developing a relationship with God, just as conversation is part of building relationships with people. Of course, relationships involve more than conversation. But if you never talk to someone, you’re probably missing out on something. There are many ways to engage God. It is our love for God and our experience of His love. Being kind to people is part of our love relationship with God. 

MŁ: How come such a hard-nosed scientist like you speaks about God so openly? 

PP: It brings to mind a story that stretches across more than a century. In 1874, physicist James Clerk Maxwell founded the Cavendish Laboratory in Cambridge. Carved on its entrance doors, he placed a passage from Psalm 111 in Latin. 

AB: As the first Cavendish Professor, Maxwell personally oversaw every aspect of the lab's creation. He was a man of deep Christian faith.  

PP: Fast forward to 1973—you, as a young research student, proposed to the departmental committee carving the same quote in English above the entrance to the new Cavendish Laboratory: 'The works of the Lord are great, sought out of all them that have pleasure therein'

AB: To the Head of Department’s surprise, the committee not only did not reject my audacious idea, but they enthusiastically supported it.  

MŁ: Another half-century passed… 

AB: And that quote still serves as a motto for the next generation—it suggests that those inside the laboratory are discovering how God makes the world work, and that this pursuit is deeply joyful. Science is a God-given resource for faith and for the work of the Church. If the Church is here to serve the world, it must engage with the world as it is. For example, during the pandemic, scientific knowledge was essential in caring for people at risk. Conversely, faith offers wisdom and a voice in public discourse. 

MŁ: What does leadership personally mean for you? 

AB: Leadership, whatever its tools or styles, is ultimately about choosing what values to lead with. You can exercise leadership in many areas. Each of us does it in our own way, within our sphere of influence, using our unique talents. I'm distinguishing between the tools of leadership—whether oratory, intellect, money, or whatever—and the deeper question of which direction you want to lead. The real question is: What kind of leadership will you exercise? 

MŁ: Is that where my responsibility lies? 

AB: Yes, and to implement that responsibility using whatever talents and opportunities we have. If you're a professor at Oxford, you have to excel in your field. But Oxford is full of opportunities beyond academia, and I feel both a responsibility and a pleasure in engaging with the wider implications of my work. 

PP: You were deeply involved in the rapid development of quantum technologies and quantum information processing, within the evolving landscape of Oxford itself. We're no longer solely a research university. There's been a growing emphasis on scientific entrepreneurship and spinning out companies. 

AB: You're absolutely right–it's been a significant cultural shift at the university. In 2021, in my lab we realized that many people wanted to use our techniques, but we had reached the limit of our capacity to help others from our own resources. As academics, we love collaborating and helping, but we hadn’t even begun to meet the commercial need. So, we worked with Said Business School to conduct market research, which confirmed there was a viable market. That’s when we spun out the company, QuantrolOx. 

MŁ: In his recent book From Strength to Strength, Arthur Brooks argues that our careers will end much sooner than we expect and asks how we should prepare for that. It seems you’ve figured that out. You seem to go from strength to strength

AB: Arthur is a valued friend. He spoke at the U.S. launch of the Human Flourishing book in Harvard. And was kind enough to host the U.S. launch of Penultimate Curiosity, the book I co-authored with the eminent artist, Roger Wagner.  

PP: I see his painting behind us. 

AB: Yes, Roger used to have his studio in this house. As you might have noticed, Arthur has been lately placing more and more emphasis on the role of faith for human happiness. 

MŁ: Through his works, Brooks has been undergoing a kind of spiritual conversion. He makes it clear now that the goal of life is happiness and human flourishing, which starts with meaningful work, friends, family and most importantly - faith. For him personally means renewing his Catholic faith daily, moment by moment

AB: And he’s been speaking about that in a way that is completely genuine and comes from the heart. 

MŁ: I think there’s a similar kind of scholarly conversion in your life, where Christian renewal meets the Greek ideal of kalokagathia—the unity of the transcendentals, also reflected in your books. Penultimate Curiosity explores beauty. It Keeps Me Seeking explores truth. Citizenship in a Networked Age explores justice. And beauty, truth, and justice find their unity in your last book: Human Flourishing. How do you see your life? 

AB: I want to keep contributing for as long as I have the energy and the wherewithal. But life is nonlinear and stochastic. 

MŁ: Professor, pray elaborate! 

AB: We make choices and we are subject to events each of which could have been otherwise, and the consequences are often out of all proportion to the causal factors. Randomness is fundamental in quantum theory where the uncertainty is very mathematically rigorously described. I sometimes wonder if today’s rising generation struggles with stress because they expect too much control over their own destiny. 

MŁ: No doubt. 

AB: And that’s where Providence comes in. What traditional spiritual English calls Providence—from the same root as to provide—is, I believe, essential to making sense of a world that is both stochastic and nonlinear. This confidence in Providence, in the idea that we can navigate a world that is chaotic and still thrive, is profoundly important. If you look at the Gospels, when Jesus called people to follow him, they took a risk. They could have been wrong, following someone who was a spoof, but they made a decision—and it turned out to be a good one. And I think it's true of deciding to follow Jesus Christ. Could I be wrong? I suppose so. I don't think I am, but I could be. I don’t have certainty, but I choose. 
 
MŁ: And how do you know it? 

AB: Think of flying. You prepare as much as you can, but unexpected situations always arise. Air traffic control sometimes tells you what to do, but mostly, they ask what your intention is. You can’t hesitate when you're flying a plane. You can't just say, well, I'm not going to decide. That's not an option. You try to make them safe choices. You try to make them wise choices. But you have to make choices. Same with life. Thinking is good. But thought must lead to action. Some say I live my life by my transferable flying skills! 

MŁ: And your final destination? 

AB: Heaven, I hope. I believe this life isn’t all there is. I believe in a future with Trinity—Father, Son, and Holy Spirit—free from pain and suffering. The risk is to focus too much on going to heaven. I think the emphasis should actually be on the other direction: heaven coming to us. 'Thy Kingdom come!' That gives dignity to this world. 

MŁ: This conversation was a foretaste of a heavenly banquet! 

AB: More like Spanish tapas—small plates, not a grand feast. 

PP: A series of little courses? 

AB: Exactly. And when you write this up, make it look like there was a plan. 

MŁ: In your nonlinear, stochastic life, we’ve already found a hidden pattern. A kind of Da Vinci Code of Andrew Briggs. 

AB: And the code is…? 

PP: Have you ever thought about combining your book titles into a life motto? Imagine it inscribed over your Northmoor Road house: Penultimate Curiosity… Keeps Me Seeking… Human Flourishing

AB: Perfect! I love it. That’s my code. 

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