Some atheists, skeptics and non- believers called to celebrate 'December 25r as Newtomms Day instead of observing Christmas Day, The reason they propose that—

1. Evolution of Calendars: Julian vs. Gregorian (basic)

Welcome! To understand how we celebrate festivals today, we first need to understand the yardstick we use to measure time: the calendar. For most of human history, calendars were created to track seasons, which was vital for agriculture Science, Class VIII, Keeping Time with the Skies, p.180. The Earth takes approximately 365.2422 days to orbit the Sun. However, simple calendars usually assume a year is exactly 365 days. To fix this "drift," we add leap years.

The Julian Calendar, introduced by Julius Caesar in 46 BCE, was a major step forward. It assumed the year was exactly 365.25 days long and added a leap day every four years. While this was close, it was slightly too long (by about 11 minutes a year). Over centuries, these minutes added up to days, causing the calendar to drift away from the actual solar seasons. By the 1500s, the calendar was about 10 days out of sync with the Spring Equinox!

To fix this, Pope Gregory XIII introduced the Gregorian Calendar in 1582. This is the calendar most of the world uses today Exploring Society: India and Beyond, Social Science-Class VI, Timeline and Sources of History, p.62. It made two critical changes: it skipped several days to "catch up" with the Sun, and it refined the leap year rule to be more precise. This precision is why some years, like 2000, were leap years, while others, like 1900, were not.

Feature	Julian Calendar (Old Style)	Gregorian Calendar (New Style)
Year Length	365.25 days	365.2425 days (approx.)
Leap Year Rule	Every year divisible by 4.	Divisible by 4, except century years unless they are divisible by 400.
Historical Drift	Gains about 3 days every 400 years.	Highly accurate; stays in sync with seasons.

An interesting consequence of this shift is seen in history. For example, Sir Isaac Newton was born on December 25, 1642, according to the Julian calendar used in England at the time. However, by the Gregorian calendar we use today, his birth date is actually January 4, 1643. This "date gap" is why some secular groups celebrate "Newtonmas" on December 25th—to honor science on a day traditionally associated with religious festivities, even though the modern calendar technically places his birth in January.

Sources: Science, Class VIII, Keeping Time with the Skies, p.180; Exploring Society: India and Beyond, Social Science-Class VI, Timeline and Sources of History, p.62

2. Major World Religions and Festive Traditions (basic)

To understand why we celebrate when we do, we must look at the sky. Human civilizations have traditionally used two primary 'clocks': the Sun and the Moon. Most major religious and festive traditions are rooted in these celestial cycles. For instance, many Indian festivals like Makar Sankranti, Pongal, and Bihu follow a solar sidereal calendar, which is why they consistently fall around January 14th each year in our modern Gregorian calendar Exploring Society: India and Beyond, Class VI, Unity in Diversity, p.132. These dates were originally tied to the winter solstice (the shortest day of the year), though they have shifted slightly over centuries due to the Earth's axial wobble—a phenomenon similar to a spinning top losing its balance Science, Class VIII, Keeping Time with the Skies, p.184.

In contrast, many other traditions rely on the Lunar or Luni-solar calendars. This is why festivals like Diwali, Holi, and Eid-ul-Fitr seem to 'move' on the Gregorian calendar every year. For example, Diwali is celebrated on the New Moon of Kartika, while Holi occurs on the Full Moon of Phalguna Science, Class VIII, Keeping Time with the Skies, p.183. Even in Western traditions, this distinction exists: Christmas is fixed by the solar calendar (December 25th), whereas Easter is a 'moveable feast' because its date is calculated based on the lunar cycle to mark the arrival of spring Themes in World History, Class XI, The Three Orders, p.94.

Beyond religion, festivals also evolve to celebrate reason and science. A fascinating example is 'Newtonmas', celebrated by skeptics and science enthusiasts on December 25th. While the world celebrates Christmas, these groups honor the birth of Sir Isaac Newton. Interestingly, Newton was born on December 25, 1642, according to the Julian calendar used in England at the time. Although the modern Gregorian calendar places his birth on January 4th, the symbolic 'coincidence' of the old date allows for a secular celebration of empirical discovery, gravity, and the laws of motion alongside traditional festivities.

Calendar Basis	Mechanism	Example Festivals
Solar	Based on Earth's orbit around the Sun. Dates stay relatively fixed.	Makar Sankranti, Christmas, Newtonmas
Lunar / Luni-solar	Based on phases of the Moon. Dates shift 10–11 days annually.	Eid-ul-Fitr, Diwali, Holi, Easter

Sources: Exploring Society: India and Beyond, Social Science-Class VI, Unity in Diversity, or 'Many in the One', p.132; Science, Class VIII, Keeping Time with the Skies, p.183-184; Themes in World History, History Class XI, The Three Orders, p.94; Physical Geography by PMF IAS, The Motions of The Earth and Their Effects, p.253

3. Indian National Calendar and Reform (exam-level)

To understand the social fabric of India, one must look at how we measure time. After Independence, India faced a unique challenge: the country used nearly 30 different calendars based on regional, religious, and historical traditions. To create administrative and social cohesion, the Government of India established the Calendar Reform Committee (CRC) in 1952 Science ,Class VIII . NCERT(Revised ed 2025), Keeping Time with the Skies, p.183. The goal was to recommend a scientifically accurate and uniform calendar that could serve as the Indian National Calendar alongside the globally used Gregorian system.

The committee chose the Shaka Samvat (or Saka Era) as the basis for the national calendar. This era was historically established by the Shakas (Indo-Scythians) who ruled parts of Northwest India between the 2nd century BCE and the 5th century CE Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025), The Age of Reorganisation, p.135. Unlike the Gregorian calendar, which is purely solar, the Indian National Calendar is based on the Surya Siddhanta, an ancient astronomical treatise that provides the scientific principles for tracking celestial movements Science ,Class VIII . NCERT(Revised ed 2025), Keeping Time with the Skies, p.183.

The National Calendar was officially adopted on March 22, 1957 (1 Chaitra 1879 Saka). Its structure is fixed to the solar year: it consists of 12 months, starting with Chaitra. In a normal year, Chaitra 1 falls on March 22, and in a leap year, it falls on March 21. This alignment ensures that the calendar stays synchronized with the seasons, which is vital for a society where many festivals and agricultural cycles are tied to the vernal equinox and lunar phases.


Calendars are more than just dates; they are tools of identity and reason. For instance, the transition from the Julian to the Gregorian calendar in Europe changed how historical dates (like the birth of Isaac Newton) are recorded. Similarly, by adopting a unified calendar, India moved toward a secular, scientific standard that respected historical roots while ensuring modern administrative efficiency Science ,Class VIII . NCERT(Revised ed 2025), Keeping Time with the Skies, p.182.

Sources: Science ,Class VIII . NCERT(Revised ed 2025), Keeping Time with the Skies, p.182-183; Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025), The Age of Reorganisation, p.135

4. The Scientific Revolution and Enlightenment (intermediate)

The Scientific Revolution and the Enlightenment represent a fundamental shift in human history: the transition from a world governed by religious dogma to one understood through reason, observation, and experimentation. Starting roughly in the 16th century, the Scientific Revolution replaced the "faith-based" explanations of the natural world with empirical evidence. As noted in Themes in World History (NCERT Class XI), Nomadic Empires, p.78, this era saw the evolution of knowledge based on experiment rather than religious belief, eventually leading to improvements in technology and the development of modern industry.

While the term "Enlightenment" in the Indian tradition often refers to spiritual awakening—such as Siddhartha Gautama attaining the state of the Buddha to teach the path of righteous living Themes in Indian History Part I (NCERT Class XII), Thinkers, Beliefs and Buildings, p.90—the European Enlightenment was a socio-political movement. It applied the logic of the laboratory to human society. Thinkers began to question traditional authority, debating the nature of ultimate reality and the significance of sacrificial traditions Themes in Indian History Part I (NCERT Class XII), Thinkers, Beliefs and Buildings, p.85. This shift moved discoveries out of the individual inventor's mind and into the structured environment of the physicist's or chemist's laboratory History (Tamil Nadu State Board), The Age of Revolutions, p.169.

One of the most intriguing modern legacies of this era is the celebration of 'Newtonmas'. Celebrated on December 25th, it serves as a secular alternative to Christmas. The date is chosen because Sir Isaac Newton was born on December 25, 1642, according to the Julian calendar (the 'Old Style' calendar used in England at the time). Even though the modern Gregorian calendar places his birth on January 4th, the coincidence of his Julian birth date with Christmas allows secular groups and skeptics to celebrate empirical discovery and the laws of universal gravitation. This highlights how festivals can evolve beyond religious roots to become celebrations of human reason and the scientific method.

Feature	Scientific Revolution (16th-17th C)	Enlightenment (18th C)
Focus	Physical world, Astronomy, Physics (e.g., Newton's Laws)	Human society, Government, Ethics, and Liberty
Method	Empirical observation and Mathematics	Application of 'Reason' to solve social problems
Impact	Changed how we see the Universe	Changed how we see the State and Individual rights

Sources: Themes in World History (NCERT Class XI), Nomadic Empires, p.78; Themes in Indian History Part I (NCERT Class XII), Thinkers, Beliefs and Buildings, p.90; Themes in Indian History Part I (NCERT Class XII), Thinkers, Beliefs and Buildings, p.85; History (Tamil Nadu State Board), The Age of Revolutions, p.169

5. Secularism and Scientific Temper in India (exam-level)

In the context of Indian society, secularism and scientific temper are not just legal concepts but lived values that shape how we celebrate our heritage. While Western secularism often implies a strict "wall of separation" between the church and the state, Indian secularism follows a model of "principled distance." This means the state maintains equal respect for all religions (Sarva Dharma Sambhava) while reserving the right to intervene for social reform Political Theory, Class XI (NCERT 2025 ed.), Secularism, p.121. This unique approach allows India to celebrate its composite culture—a blend of various traditions that the Constitution urges us to preserve.

Parallel to secularism is the concept of Scientific Temper. Interestingly, India is one of the few countries in the world to explicitly include this in its Constitution. Under Article 51A(h), it is a Fundamental Duty of every citizen "to develop the scientific temper, humanism and the spirit of inquiry and reform" Introduction to the Constitution of India, D. D. Basu (26th ed.), FUNDAMENTAL RIGHTS AND FUNDAMENTAL DUTIES, p.162. This duty acts as a bridge between tradition and modernity, encouraging citizens to approach social and religious practices with a mindset rooted in logic, observation, and empirical evidence rather than blind dogma.

A fascinating intersection of these two concepts can be seen in the global and domestic rise of secular festivals. For instance, many atheists, skeptics, and rationalists celebrate "Newtonmas" on December 25th. This date is chosen because Sir Isaac Newton was born on December 25, 1642, according to the Julian calendar. By using a date traditionally reserved for a major religious holiday (Christmas) to honor the laws of physics and universal gravitation, these groups demonstrate a spirit of inquiry. In India, such expressions reflect the constitutional aspiration to balance our rich religious history with a forward-looking, rational society.

Concept	Indian Context	Constitutional Basis
Secularism	Equal respect and peaceful coexistence of all faiths.	Preamble, Articles 25-28
Scientific Temper	A spirit of inquiry and rational thinking in social life.	Article 51A(h)

Sources: Political Theory, Class XI (NCERT 2025 ed.), Secularism, p.121; Introduction to the Constitution of India, D. D. Basu (26th ed.), FUNDAMENTAL RIGHTS AND FUNDAMENTAL DUTIES, p.162

6. Isaac Newton: The Icon of Classical Physics (intermediate)

Isaac Newton represents the peak of the Scientific Revolution, a period that fundamentally shifted the human perspective from superstition to empirical evidence. His work transformed science into a discipline of rigorous mathematical proof. His most famous contribution, the Theory of Universal Gravitation, suggested that the same physical laws apply to both the heavens and the Earth, effectively uniting the study of terrestrial and celestial mechanics. This monumental work reached its climax in his 1687 publication, Philosophiae Naturalis Principia Mathematica Themes in World History, Changing Cultural Traditions, p.119. Newton’s impact is so foundational to our understanding of the physical world that the SI unit of force is named the newton (N) in his honor Science Class VIII, Exploring Forces, p.65.

Newton was also a pioneer in optics, the study of light. Before his experiments, it was commonly believed that color was a quality of objects themselves. However, Newton used a glass prism to split white sunlight into a spectrum of seven colors. He further proved his theory by placing a second, inverted prism in the path of this spectrum, which recombined the colors back into white light Science Class X, The Human Eye and the Colourful World, p.167. This proved that white light is not pure, but a composite of various colors, a discovery that laid the groundwork for modern physics and astronomy.

Interestingly, in the context of modern society and festivals, Newton has become a symbol for secularism through the celebration of 'Newtonmas' on December 25th. This tradition serves as a secular alternative to religious holidays, focusing on reason and science. The date is chosen because, under the Julian calendar (the 'Old Style' calendar used in England during his time), Newton was born on December 25, 1642. Although the modern Gregorian calendar places his birth on January 4, 1643, the symbolic coincidence allows science enthusiasts to honor his legacy of discovery on a day traditionally reserved for faith.

Sources: Themes in World History, Changing Cultural Traditions, p.119; Science Class VIII, Exploring Forces, p.65; Science Class X, The Human Eye and the Colourful World, p.167

7. Newtonmas: Rationalist Alternatives to Tradition (intermediate)

In the study of festivals and society, we often focus on religious traditions. However, a fascinating rationalist alternative is Newtonmas, celebrated by atheists, skeptics, and science enthusiasts on December 25th. While most of the world observes Christmas on this day, secular groups use it to honor Sir Isaac Newton, the father of modern physics and calculus. The choice of date is not random; Newton was born on December 25, 1642, according to the Julian calendar (the 'Old Style' calendar used in England at the time). Even though the modern Gregorian calendar places his birth on January 4, 1643, the symbolic alignment with December 25th allows for a secular counterpoint to religious tradition, shifting the focus from divine miracles to empirical discovery and the laws of nature, such as universal gravitation. This movement mirrors the broader intellectual shift toward Rationalism and Humanism. Rationalism advocates for a 'faith in reason' and a scientific attitude, suggesting that human intellect has the capacity to remodel society on just lines Spectrum: A Brief History of Modern India, Survey of British Policies in India, p.536. In the Indian context, the 19th-century socio-religious reform movements were similarly rooted in these twin doctrines. Reformers like Raja Ram Mohan Roy argued that religious dogmas should be tested by the discoveries of reason, much like any other science Modern India (Bipin Chandra), Growth of New India Religious and Social Reform After 1858, p.224. Newtonmas serves as a modern, global manifestation of this desire to celebrate the human capacity for logic over blind faith. From a political science perspective, the existence of secular alternatives like Newtonmas highlights the nuances of secularism. Western secularism often emphasizes the 'mutual exclusion' of state and religion, treating faith as a private matter Indian Constitution at Work, THE PHILOSOPHY OF THE CONSTITUTION, p.229. Celebrations like Newtonmas allow individuals to exercise their rights to a non-religious identity while still participating in the social ritual of gift-giving and gathering Political Theory, Secularism, p.128. It illustrates that secularism is not merely the absence of religion, but the presence of alternative frameworks—like science and reason—through which humanity can find meaning and progress.

Sources: Spectrum: A Brief History of Modern India, Survey of British Policies in India, p.536; Modern India (Bipin Chandra), Growth of New India Religious and Social Reform After 1858, p.224; Indian Constitution at Work, THE PHILOSOPHY OF THE CONSTITUTION, p.229; Political Theory, Secularism, p.128

8. Solving the Original PYQ (exam-level)

This question bridges the gap between the Scientific Revolution and modern secular humanism. Having explored how figures like Isaac Newton shifted the human perspective from dogma to empirical reasoning, you can see why modern skeptics would adopt him as a symbol. The core of this question lies in the historical overlap of calendars; the transition from the Julian calendar to the Gregorian calendar creates a unique opportunity to celebrate scientific progress on a day traditionally reserved for religious observance. As a student of history and science, you are connecting the cultural legacy of a scientist to the secularization of public holidays.

To arrive at (B) Isaac Newton was born on 25th December, you must apply the logic of symbolic substitution. Since Newton was born on December 25, 1642 (Old Style), he serves as a perfect "secular saint" for those who prioritize the laws of motion and universal gravitation over religious narrative. As a coach, I want you to notice how the UPSC often tests the rationality behind cultural phenomena. The "Newtonmas" celebration is a calculated choice to honor the birth of modern physics on a globally recognized date, allowing non-believers to participate in the festive season through the lens of science and rationality.

When analyzing the distractors, notice the common UPSC traps. Option (A) is a distraction of false equivalence; while both figures were influential, the goal of the groups mentioned is to provide an alternative, not a comparison. Option (C) is a fictionalized detail designed to sound plausible to an unprepared candidate. Finally, Option (D) is a contextual trap; although historical records in The Newton Project (Oxford University) confirm Newton was a deep believer, that fact actually contradicts the motivation of the atheists and skeptics in this specific context. They celebrate him for his scientific contributions, not his personal theology, making (B) the only logical driver for their specific choice of date.